[client] Add flag to configure MTU (#4213)

client/cmd/root.go

@@ -39,6 +39,7 @@ const (
 	extraIFaceBlackListFlag  = "extra-iface-blacklist"
 	dnsRouteIntervalFlag     = "dns-router-interval"
 	enableLazyConnectionFlag = "enable-lazy-connection"
+	mtuFlag                  = "mtu"
 )
 
 var (
@@ -72,6 +73,7 @@ var (
 	anonymizeFlag           bool
 	dnsRouteInterval        time.Duration
 	lazyConnEnabled         bool
+	mtu                     uint16
 	profilesDisabled        bool
 	updateSettingsDisabled  bool
 

client/cmd/root_test.go

@@ -54,6 +54,7 @@ func TestSetFlagsFromEnvVars(t *testing.T) {
 	cmd.PersistentFlags().StringVar(&interfaceName, interfaceNameFlag, iface.WgInterfaceDefault, "WireGuard interface name")
 	cmd.PersistentFlags().BoolVar(&rosenpassEnabled, enableRosenpassFlag, false, "Enable Rosenpass feature Rosenpass.")
 	cmd.PersistentFlags().Uint16Var(&wireguardPort, wireguardPortFlag, iface.DefaultWgPort, "WireGuard interface listening port")
+	cmd.PersistentFlags().Uint16Var(&mtu, mtuFlag, iface.DefaultMTU, "Set MTU (Maximum Transmission Unit) for the WireGuard interface")
 
 	t.Setenv("NB_EXTERNAL_IP_MAP", "abc,dec")
 	t.Setenv("NB_INTERFACE_NAME", "test-name")

client/cmd/up.go

@@ -63,6 +63,7 @@ func init() {
 	upCmd.PersistentFlags().BoolVarP(&foregroundMode, "foreground-mode", "F", false, "start service in foreground")
 	upCmd.PersistentFlags().StringVar(&interfaceName, interfaceNameFlag, iface.WgInterfaceDefault, "WireGuard interface name")
 	upCmd.PersistentFlags().Uint16Var(&wireguardPort, wireguardPortFlag, iface.DefaultWgPort, "WireGuard interface listening port")
+	upCmd.PersistentFlags().Uint16Var(&mtu, mtuFlag, iface.DefaultMTU, "Set MTU (Maximum Transmission Unit) for the WireGuard interface")
 	upCmd.PersistentFlags().BoolVarP(&networkMonitor, networkMonitorFlag, "N", networkMonitor,
 		`Manage network monitoring. Defaults to true on Windows and macOS, false on Linux and FreeBSD. `+
 			`E.g. --network-monitor=false to disable or --network-monitor=true to enable.`,
@@ -357,6 +358,11 @@ func setupSetConfigReq(customDNSAddressConverted []byte, cmd *cobra.Command, pro
 		req.WireguardPort = &p
 	}
 
+	if cmd.Flag(mtuFlag).Changed {
+		m := int64(mtu)
+		req.Mtu = &m
+	}
+
 	if cmd.Flag(networkMonitorFlag).Changed {
 		req.NetworkMonitor = &networkMonitor
 	}
@@ -436,6 +442,13 @@ func setupConfig(customDNSAddressConverted []byte, cmd *cobra.Command, configFil
 		ic.WireguardPort = &p
 	}
 
+	if cmd.Flag(mtuFlag).Changed {
+		if err := iface.ValidateMTU(mtu); err != nil {
+			return nil, err
+		}
+		ic.MTU = &mtu
+	}
+
 	if cmd.Flag(networkMonitorFlag).Changed {
 		ic.NetworkMonitor = &networkMonitor
 	}
@@ -533,6 +546,14 @@ func setupLoginRequest(providedSetupKey string, customDNSAddressConverted []byte
 		loginRequest.WireguardPort = &wp
 	}
 
+	if cmd.Flag(mtuFlag).Changed {
+		if err := iface.ValidateMTU(mtu); err != nil {
+			return nil, err
+		}
+		m := int64(mtu)
+		loginRequest.Mtu = &m
+	}
+
 	if cmd.Flag(networkMonitorFlag).Changed {
 		loginRequest.NetworkMonitor = &networkMonitor
 	}

client/iface/bind/ice_bind.go

@@ -56,10 +56,11 @@ type ICEBind struct {
 	muUDPMux         sync.Mutex
 	udpMux           *UniversalUDPMuxDefault
 	address          wgaddr.Address
+	mtu              uint16
 	activityRecorder *ActivityRecorder
 }
 
-func NewICEBind(transportNet transport.Net, filterFn FilterFn, address wgaddr.Address) *ICEBind {
+func NewICEBind(transportNet transport.Net, filterFn FilterFn, address wgaddr.Address, mtu uint16) *ICEBind {
 	b, _ := wgConn.NewStdNetBind().(*wgConn.StdNetBind)
 	ib := &ICEBind{
 		StdNetBind:       b,
@@ -69,6 +70,7 @@ func NewICEBind(transportNet transport.Net, filterFn FilterFn, address wgaddr.Ad
 		endpoints:        make(map[netip.Addr]net.Conn),
 		closedChan:       make(chan struct{}),
 		closed:           true,
+		mtu:              mtu,
 		address:          address,
 		activityRecorder: NewActivityRecorder(),
 	}
@@ -80,6 +82,10 @@ func NewICEBind(transportNet transport.Net, filterFn FilterFn, address wgaddr.Ad
 	return ib
 }
 
+func (s *ICEBind) MTU() uint16 {
+	return s.mtu
+}
+
 func (s *ICEBind) Open(uport uint16) ([]wgConn.ReceiveFunc, uint16, error) {
 	s.closed = false
 	s.closedChanMu.Lock()
@@ -158,6 +164,7 @@ func (s *ICEBind) createIPv4ReceiverFn(pc *ipv4.PacketConn, conn *net.UDPConn, r
 			Net:       s.transportNet,
 			FilterFn:  s.filterFn,
 			WGAddress: s.address,
+			MTU:       s.mtu,
 		},
 	)
 	return func(bufs [][]byte, sizes []int, eps []wgConn.Endpoint) (n int, err error) {

client/iface/bind/udp_mux_ios.go

@@ -4,4 +4,4 @@ package bind
 
 func (m *UDPMuxDefault) notifyAddressRemoval(addr string) {
 	// iOS doesn't support nbnet hooks, so this is a no-op
-}
+}

client/iface/bind/udp_mux_universal.go

@@ -18,6 +18,7 @@ import (
 	"github.com/pion/stun/v2"
 	"github.com/pion/transport/v3"
 
+	"github.com/netbirdio/netbird/client/iface/bufsize"
 	"github.com/netbirdio/netbird/client/iface/wgaddr"
 )
 
@@ -44,6 +45,7 @@ type UniversalUDPMuxParams struct {
 	Net                   transport.Net
 	FilterFn              FilterFn
 	WGAddress             wgaddr.Address
+	MTU                   uint16
 }
 
 // NewUniversalUDPMuxDefault creates an implementation of UniversalUDPMux embedding UDPMux
@@ -84,7 +86,7 @@ func NewUniversalUDPMuxDefault(params UniversalUDPMuxParams) *UniversalUDPMuxDef
 // just ignore other packets printing an warning message.
 // It is a blocking method, consider running in a go routine.
 func (m *UniversalUDPMuxDefault) ReadFromConn(ctx context.Context) {
-	buf := make([]byte, 1500)
+	buf := make([]byte, m.params.MTU+bufsize.WGBufferOverhead)
 	for {
 		select {
 		case <-ctx.Done():

client/iface/bufsize/bufsize.go

@@ -0,0 +1,9 @@
+package bufsize
+
+const (
+	// WGBufferOverhead represents the additional buffer space needed beyond MTU
+	// for WireGuard packet encapsulation (WG header + UDP + IP + safety margin)
+	// Original hardcoded buffers were 1500, default MTU is 1280, so overhead = 220
+	// TODO: Calculate this properly based on actual protocol overhead instead of using hardcoded difference
+	WGBufferOverhead = 220
+)

client/iface/device.go

@@ -17,6 +17,7 @@ type WGTunDevice interface {
 	Up() (*bind.UniversalUDPMuxDefault, error)
 	UpdateAddr(address wgaddr.Address) error
 	WgAddress() wgaddr.Address
+	MTU() uint16
 	DeviceName() string
 	Close() error
 	FilteredDevice() *device.FilteredDevice

client/iface/device/device_android.go

@@ -21,7 +21,7 @@ type WGTunDevice struct {
 	address    wgaddr.Address
 	port       int
 	key        string
-	mtu        int
+	mtu        uint16
 	iceBind    *bind.ICEBind
 	tunAdapter TunAdapter
 	disableDNS bool
@@ -33,7 +33,7 @@ type WGTunDevice struct {
 	configurer     WGConfigurer
 }
 
-func NewTunDevice(address wgaddr.Address, port int, key string, mtu int, iceBind *bind.ICEBind, tunAdapter TunAdapter, disableDNS bool) *WGTunDevice {
+func NewTunDevice(address wgaddr.Address, port int, key string, mtu uint16, iceBind *bind.ICEBind, tunAdapter TunAdapter, disableDNS bool) *WGTunDevice {
 	return &WGTunDevice{
 		address:    address,
 		port:       port,
@@ -58,7 +58,7 @@ func (t *WGTunDevice) Create(routes []string, dns string, searchDomains []string
 		searchDomainsToString = ""
 	}
 
-	fd, err := t.tunAdapter.ConfigureInterface(t.address.String(), t.mtu, dns, searchDomainsToString, routesString)
+	fd, err := t.tunAdapter.ConfigureInterface(t.address.String(), int(t.mtu), dns, searchDomainsToString, routesString)
 	if err != nil {
 		log.Errorf("failed to create Android interface: %s", err)
 		return nil, err
@@ -137,6 +137,10 @@ func (t *WGTunDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 
+func (t *WGTunDevice) MTU() uint16 {
+	return t.mtu
+}
+
 func (t *WGTunDevice) FilteredDevice() *FilteredDevice {
 	return t.filteredDevice
 }

client/iface/device/device_darwin.go

@@ -21,7 +21,7 @@ type TunDevice struct {
 	address wgaddr.Address
 	port    int
 	key     string
-	mtu     int
+	mtu     uint16
 	iceBind *bind.ICEBind
 
 	device         *device.Device
@@ -30,7 +30,7 @@ type TunDevice struct {
 	configurer     WGConfigurer
 }
 
-func NewTunDevice(name string, address wgaddr.Address, port int, key string, mtu int, iceBind *bind.ICEBind) *TunDevice {
+func NewTunDevice(name string, address wgaddr.Address, port int, key string, mtu uint16, iceBind *bind.ICEBind) *TunDevice {
 	return &TunDevice{
 		name:    name,
 		address: address,
@@ -42,7 +42,7 @@ func NewTunDevice(name string, address wgaddr.Address, port int, key string, mtu
 }
 
 func (t *TunDevice) Create() (WGConfigurer, error) {
-	tunDevice, err := tun.CreateTUN(t.name, t.mtu)
+	tunDevice, err := tun.CreateTUN(t.name, int(t.mtu))
 	if err != nil {
 		return nil, fmt.Errorf("error creating tun device: %s", err)
 	}
@@ -111,6 +111,10 @@ func (t *TunDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 
+func (t *TunDevice) MTU() uint16 {
+	return t.mtu
+}
+
 func (t *TunDevice) DeviceName() string {
 	return t.name
 }

client/iface/device/device_ios.go

@@ -22,6 +22,7 @@ type TunDevice struct {
 	address wgaddr.Address
 	port    int
 	key     string
+	mtu     uint16
 	iceBind *bind.ICEBind
 	tunFd   int
 
@@ -31,12 +32,13 @@ type TunDevice struct {
 	configurer     WGConfigurer
 }
 
-func NewTunDevice(name string, address wgaddr.Address, port int, key string, iceBind *bind.ICEBind, tunFd int) *TunDevice {
+func NewTunDevice(name string, address wgaddr.Address, port int, key string, mtu uint16, iceBind *bind.ICEBind, tunFd int) *TunDevice {
 	return &TunDevice{
 		name:    name,
 		address: address,
 		port:    port,
 		key:     key,
+		mtu:     mtu,
 		iceBind: iceBind,
 		tunFd:   tunFd,
 	}
@@ -125,6 +127,10 @@ func (t *TunDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 
+func (t *TunDevice) MTU() uint16 {
+	return t.mtu
+}
+
 func (t *TunDevice) UpdateAddr(_ wgaddr.Address) error {
 	// todo implement
 	return nil

client/iface/device/device_kernel_unix.go

@@ -24,7 +24,7 @@ type TunKernelDevice struct {
 	address      wgaddr.Address
 	wgPort       int
 	key          string
-	mtu          int
+	mtu          uint16
 	ctx          context.Context
 	ctxCancel    context.CancelFunc
 	transportNet transport.Net
@@ -36,7 +36,7 @@ type TunKernelDevice struct {
 	filterFn bind.FilterFn
 }
 
-func NewKernelDevice(name string, address wgaddr.Address, wgPort int, key string, mtu int, transportNet transport.Net) *TunKernelDevice {
+func NewKernelDevice(name string, address wgaddr.Address, wgPort int, key string, mtu uint16, transportNet transport.Net) *TunKernelDevice {
 	ctx, cancel := context.WithCancel(context.Background())
 	return &TunKernelDevice{
 		ctx:          ctx,
@@ -66,7 +66,7 @@ func (t *TunKernelDevice) Create() (WGConfigurer, error) {
 	// TODO: do a MTU discovery
 	log.Debugf("setting MTU: %d interface: %s", t.mtu, t.name)
 
-	if err := link.setMTU(t.mtu); err != nil {
+	if err := link.setMTU(int(t.mtu)); err != nil {
 		return nil, fmt.Errorf("set mtu: %w", err)
 	}
 
@@ -96,7 +96,7 @@ func (t *TunKernelDevice) Up() (*bind.UniversalUDPMuxDefault, error) {
 		return nil, err
 	}
 
-	rawSock, err := sharedsock.Listen(t.wgPort, sharedsock.NewIncomingSTUNFilter())
+	rawSock, err := sharedsock.Listen(t.wgPort, sharedsock.NewIncomingSTUNFilter(), t.mtu)
 	if err != nil {
 		return nil, err
 	}
@@ -111,6 +111,7 @@ func (t *TunKernelDevice) Up() (*bind.UniversalUDPMuxDefault, error) {
 		Net:       t.transportNet,
 		FilterFn:  t.filterFn,
 		WGAddress: t.address,
+		MTU:       t.mtu,
 	}
 	mux := bind.NewUniversalUDPMuxDefault(bindParams)
 	go mux.ReadFromConn(t.ctx)
@@ -158,6 +159,10 @@ func (t *TunKernelDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 
+func (t *TunKernelDevice) MTU() uint16 {
+	return t.mtu
+}
+
 func (t *TunKernelDevice) DeviceName() string {
 	return t.name
 }

client/iface/device/device_netstack.go

@@ -19,7 +19,7 @@ type TunNetstackDevice struct {
 	address       wgaddr.Address
 	port          int
 	key           string
-	mtu           int
+	mtu           uint16
 	listenAddress string
 	iceBind       *bind.ICEBind
 
@@ -32,7 +32,7 @@ type TunNetstackDevice struct {
 	net *netstack.Net
 }
 
-func NewNetstackDevice(name string, address wgaddr.Address, wgPort int, key string, mtu int, iceBind *bind.ICEBind, listenAddress string) *TunNetstackDevice {
+func NewNetstackDevice(name string, address wgaddr.Address, wgPort int, key string, mtu uint16, iceBind *bind.ICEBind, listenAddress string) *TunNetstackDevice {
 	return &TunNetstackDevice{
 		name:          name,
 		address:       address,
@@ -54,7 +54,7 @@ func (t *TunNetstackDevice) create() (WGConfigurer, error) {
 	}
 
 	log.Debugf("netstack using address: %s", t.address.IP)
-	t.nsTun = nbnetstack.NewNetStackTun(t.listenAddress, t.address.IP, dnsAddr, t.mtu)
+	t.nsTun = nbnetstack.NewNetStackTun(t.listenAddress, t.address.IP, dnsAddr, int(t.mtu))
 	log.Debugf("netstack using dns address: %s", dnsAddr)
 	tunIface, net, err := t.nsTun.Create()
 	if err != nil {
@@ -122,6 +122,10 @@ func (t *TunNetstackDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 
+func (t *TunNetstackDevice) MTU() uint16 {
+	return t.mtu
+}
+
 func (t *TunNetstackDevice) DeviceName() string {
 	return t.name
 }

client/iface/device/device_usp_unix.go

@@ -20,7 +20,7 @@ type USPDevice struct {
 	address wgaddr.Address
 	port    int
 	key     string
-	mtu     int
+	mtu     uint16
 	iceBind *bind.ICEBind
 
 	device         *device.Device
@@ -29,7 +29,7 @@ type USPDevice struct {
 	configurer     WGConfigurer
 }
 
-func NewUSPDevice(name string, address wgaddr.Address, port int, key string, mtu int, iceBind *bind.ICEBind) *USPDevice {
+func NewUSPDevice(name string, address wgaddr.Address, port int, key string, mtu uint16, iceBind *bind.ICEBind) *USPDevice {
 	log.Infof("using userspace bind mode")
 
 	return &USPDevice{
@@ -44,9 +44,9 @@ func NewUSPDevice(name string, address wgaddr.Address, port int, key string, mtu
 
 func (t *USPDevice) Create() (WGConfigurer, error) {
 	log.Info("create tun interface")
-	tunIface, err := tun.CreateTUN(t.name, t.mtu)
+	tunIface, err := tun.CreateTUN(t.name, int(t.mtu))
 	if err != nil {
-		log.Debugf("failed to create tun interface (%s, %d): %s", t.name, t.mtu, err)
+		log.Debugf("failed to create tun interface (%s, %d): %s", t.name, int(t.mtu), err)
 		return nil, fmt.Errorf("error creating tun device: %s", err)
 	}
 	t.filteredDevice = newDeviceFilter(tunIface)
@@ -118,6 +118,10 @@ func (t *USPDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 
+func (t *USPDevice) MTU() uint16 {
+	return t.mtu
+}
+
 func (t *USPDevice) DeviceName() string {
 	return t.name
 }

client/iface/device/device_windows.go

@@ -23,7 +23,7 @@ type TunDevice struct {
 	address wgaddr.Address
 	port    int
 	key     string
-	mtu     int
+	mtu     uint16
 	iceBind *bind.ICEBind
 
 	device          *device.Device
@@ -33,7 +33,7 @@ type TunDevice struct {
 	configurer      WGConfigurer
 }
 
-func NewTunDevice(name string, address wgaddr.Address, port int, key string, mtu int, iceBind *bind.ICEBind) *TunDevice {
+func NewTunDevice(name string, address wgaddr.Address, port int, key string, mtu uint16, iceBind *bind.ICEBind) *TunDevice {
 	return &TunDevice{
 		name:    name,
 		address: address,
@@ -59,7 +59,7 @@ func (t *TunDevice) Create() (WGConfigurer, error) {
 		return nil, err
 	}
 	log.Info("create tun interface")
-	tunDevice, err := tun.CreateTUNWithRequestedGUID(t.name, &guid, t.mtu)
+	tunDevice, err := tun.CreateTUNWithRequestedGUID(t.name, &guid, int(t.mtu))
 	if err != nil {
 		return nil, fmt.Errorf("error creating tun device: %s", err)
 	}
@@ -144,6 +144,10 @@ func (t *TunDevice) WgAddress() wgaddr.Address {
 	return t.address
 }
 
+func (t *TunDevice) MTU() uint16 {
+	return t.mtu
+}
+
 func (t *TunDevice) DeviceName() string {
 	return t.name
 }

client/iface/device_android.go

@@ -15,6 +15,7 @@ type WGTunDevice interface {
 	Up() (*bind.UniversalUDPMuxDefault, error)
 	UpdateAddr(address wgaddr.Address) error
 	WgAddress() wgaddr.Address
+	MTU() uint16
 	DeviceName() string
 	Close() error
 	FilteredDevice() *device.FilteredDevice

client/iface/iface.go

@@ -26,6 +26,8 @@ import (
 
 const (
 	DefaultMTU         = 1280
+	MinMTU             = 576
+	MaxMTU             = 8192
 	DefaultWgPort      = 51820
 	WgInterfaceDefault = configurer.WgInterfaceDefault
 )
@@ -35,6 +37,17 @@ var (
 	ErrIfaceNotFound = fmt.Errorf("wireguard interface not found")
 )
 
+// ValidateMTU validates that MTU is within acceptable range
+func ValidateMTU(mtu uint16) error {
+	if mtu < MinMTU {
+		return fmt.Errorf("MTU %d below minimum (%d bytes)", mtu, MinMTU)
+	}
+	if mtu > MaxMTU {
+		return fmt.Errorf("MTU %d exceeds maximum supported size (%d bytes)", mtu, MaxMTU)
+	}
+	return nil
+}
+
 type wgProxyFactory interface {
 	GetProxy() wgproxy.Proxy
 	Free() error
@@ -45,7 +58,7 @@ type WGIFaceOpts struct {
 	Address      string
 	WGPort       int
 	WGPrivKey    string
-	MTU          int
+	MTU          uint16
 	MobileArgs   *device.MobileIFaceArguments
 	TransportNet transport.Net
 	FilterFn     bind.FilterFn
@@ -82,6 +95,10 @@ func (w *WGIface) Address() wgaddr.Address {
 	return w.tun.WgAddress()
 }
 
+func (w *WGIface) MTU() uint16 {
+	return w.tun.MTU()
+}
+
 // ToInterface returns the net.Interface for the Wireguard interface
 func (r *WGIface) ToInterface() *net.Interface {
 	name := r.tun.DeviceName()

client/iface/iface_new_android.go

@@ -15,7 +15,7 @@ func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
 		return nil, err
 	}
 
-	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress)
+	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress, opts.MTU)
 
 	if netstack.IsEnabled() {
 		wgIFace := &WGIface{

client/iface/iface_new_darwin.go

@@ -17,7 +17,7 @@ func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
 		return nil, err
 	}
 
-	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress)
+	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress, opts.MTU)
 
 	var tun WGTunDevice
 	if netstack.IsEnabled() {

client/iface/iface_new_ios.go

@@ -16,10 +16,10 @@ func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
 		return nil, err
 	}
 
-	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress)
+	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress, opts.MTU)
 
 	wgIFace := &WGIface{
-		tun:            device.NewTunDevice(opts.IFaceName, wgAddress, opts.WGPort, opts.WGPrivKey, iceBind, opts.MobileArgs.TunFd),
+		tun:            device.NewTunDevice(opts.IFaceName, wgAddress, opts.WGPort, opts.WGPrivKey, opts.MTU, iceBind, opts.MobileArgs.TunFd),
 		userspaceBind:  true,
 		wgProxyFactory: wgproxy.NewUSPFactory(iceBind),
 	}

client/iface/iface_new_unix.go

@@ -22,7 +22,7 @@ func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
 	wgIFace := &WGIface{}
 
 	if netstack.IsEnabled() {
-		iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress)
+		iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress, opts.MTU)
 		wgIFace.tun = device.NewNetstackDevice(opts.IFaceName, wgAddress, opts.WGPort, opts.WGPrivKey, opts.MTU, iceBind, netstack.ListenAddr())
 		wgIFace.userspaceBind = true
 		wgIFace.wgProxyFactory = wgproxy.NewUSPFactory(iceBind)
@@ -31,11 +31,11 @@ func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
 
 	if device.WireGuardModuleIsLoaded() {
 		wgIFace.tun = device.NewKernelDevice(opts.IFaceName, wgAddress, opts.WGPort, opts.WGPrivKey, opts.MTU, opts.TransportNet)
-		wgIFace.wgProxyFactory = wgproxy.NewKernelFactory(opts.WGPort)
+		wgIFace.wgProxyFactory = wgproxy.NewKernelFactory(opts.WGPort, opts.MTU)
 		return wgIFace, nil
 	}
 	if device.ModuleTunIsLoaded() {
-		iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress)
+		iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress, opts.MTU)
 		wgIFace.tun = device.NewUSPDevice(opts.IFaceName, wgAddress, opts.WGPort, opts.WGPrivKey, opts.MTU, iceBind)
 		wgIFace.userspaceBind = true
 		wgIFace.wgProxyFactory = wgproxy.NewUSPFactory(iceBind)

client/iface/iface_new_windows.go

@@ -14,7 +14,7 @@ func NewWGIFace(opts WGIFaceOpts) (*WGIface, error) {
 	if err != nil {
 		return nil, err
 	}
-	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress)
+	iceBind := bind.NewICEBind(opts.TransportNet, opts.FilterFn, wgAddress, opts.MTU)
 
 	var tun WGTunDevice
 	if netstack.IsEnabled() {

client/iface/wgproxy/bind/proxy.go

@@ -12,6 +12,7 @@ import (
 	log "github.com/sirupsen/logrus"
 
 	"github.com/netbirdio/netbird/client/iface/bind"
+	"github.com/netbirdio/netbird/client/iface/bufsize"
 	"github.com/netbirdio/netbird/client/iface/wgproxy/listener"
 )
 
@@ -135,7 +136,7 @@ func (p *ProxyBind) proxyToLocal(ctx context.Context) {
 	}()
 
 	for {
-		buf := make([]byte, 1500)
+		buf := make([]byte, p.Bind.MTU()+bufsize.WGBufferOverhead)
 		n, err := p.remoteConn.Read(buf)
 		if err != nil {
 			if ctx.Err() != nil {

client/iface/wgproxy/ebpf/proxy.go

@@ -17,6 +17,7 @@ import (
 	log "github.com/sirupsen/logrus"
 
 	nberrors "github.com/netbirdio/netbird/client/errors"
+	"github.com/netbirdio/netbird/client/iface/bufsize"
 	"github.com/netbirdio/netbird/client/internal/ebpf"
 	ebpfMgr "github.com/netbirdio/netbird/client/internal/ebpf/manager"
 	nbnet "github.com/netbirdio/netbird/util/net"
@@ -29,6 +30,7 @@ const (
 // WGEBPFProxy definition for proxy with EBPF support
 type WGEBPFProxy struct {
 	localWGListenPort int
+	mtu               uint16
 
 	ebpfManager   ebpfMgr.Manager
 	turnConnStore map[uint16]net.Conn
@@ -43,10 +45,11 @@ type WGEBPFProxy struct {
 }
 
 // NewWGEBPFProxy create new WGEBPFProxy instance
-func NewWGEBPFProxy(wgPort int) *WGEBPFProxy {
+func NewWGEBPFProxy(wgPort int, mtu uint16) *WGEBPFProxy {
 	log.Debugf("instantiate ebpf proxy")
 	wgProxy := &WGEBPFProxy{
 		localWGListenPort: wgPort,
+		mtu:               mtu,
 		ebpfManager:       ebpf.GetEbpfManagerInstance(),
 		turnConnStore:     make(map[uint16]net.Conn),
 	}
@@ -138,7 +141,7 @@ func (p *WGEBPFProxy) Free() error {
 // proxyToRemote read messages from local WireGuard interface and forward it to remote conn
 // From this go routine has only one instance.
 func (p *WGEBPFProxy) proxyToRemote() {
-	buf := make([]byte, 1500)
+	buf := make([]byte, p.mtu+bufsize.WGBufferOverhead)
 	for p.ctx.Err() == nil {
 		if err := p.readAndForwardPacket(buf); err != nil {
 			if p.ctx.Err() != nil {

client/iface/wgproxy/ebpf/proxy_test.go

@@ -7,7 +7,7 @@ import (
 )
 
 func TestWGEBPFProxy_connStore(t *testing.T) {
-	wgProxy := NewWGEBPFProxy(1)
+	wgProxy := NewWGEBPFProxy(1, 1280)
 
 	p, _ := wgProxy.storeTurnConn(nil)
 	if p != 1 {
@@ -27,7 +27,7 @@ func TestWGEBPFProxy_connStore(t *testing.T) {
 }
 
 func TestWGEBPFProxy_portCalculation_overflow(t *testing.T) {
-	wgProxy := NewWGEBPFProxy(1)
+	wgProxy := NewWGEBPFProxy(1, 1280)
 
 	_, _ = wgProxy.storeTurnConn(nil)
 	wgProxy.lastUsedPort = 65535
@@ -43,7 +43,7 @@ func TestWGEBPFProxy_portCalculation_overflow(t *testing.T) {
 }
 
 func TestWGEBPFProxy_portCalculation_maxConn(t *testing.T) {
-	wgProxy := NewWGEBPFProxy(1)
+	wgProxy := NewWGEBPFProxy(1, 1280)
 
 	for i := 0; i < 65535; i++ {
 		_, _ = wgProxy.storeTurnConn(nil)

client/iface/wgproxy/ebpf/wrapper.go

@@ -12,6 +12,7 @@ import (
 
 	log "github.com/sirupsen/logrus"
 
+	"github.com/netbirdio/netbird/client/iface/bufsize"
 	"github.com/netbirdio/netbird/client/iface/wgproxy/listener"
 )
 
@@ -103,7 +104,7 @@ func (e *ProxyWrapper) CloseConn() error {
 func (p *ProxyWrapper) proxyToLocal(ctx context.Context) {
 	defer p.WgeBPFProxy.removeTurnConn(uint16(p.wgEndpointAddr.Port))
 
-	buf := make([]byte, 1500)
+	buf := make([]byte, p.WgeBPFProxy.mtu+bufsize.WGBufferOverhead)
 	for {
 		n, err := p.readFromRemote(ctx, buf)
 		if err != nil {

client/iface/wgproxy/factory_kernel.go

@@ -11,16 +11,18 @@ import (
 
 type KernelFactory struct {
 	wgPort int
+	mtu    uint16
 
 	ebpfProxy *ebpf.WGEBPFProxy
 }
 
-func NewKernelFactory(wgPort int) *KernelFactory {
+func NewKernelFactory(wgPort int, mtu uint16) *KernelFactory {
 	f := &KernelFactory{
 		wgPort: wgPort,
+		mtu:    mtu,
 	}
 
-	ebpfProxy := ebpf.NewWGEBPFProxy(wgPort)
+	ebpfProxy := ebpf.NewWGEBPFProxy(wgPort, mtu)
 	if err := ebpfProxy.Listen(); err != nil {
 		log.Infof("WireGuard Proxy Factory will produce UDP proxy")
 		log.Warnf("failed to initialize ebpf proxy, fallback to user space proxy: %s", err)
@@ -33,7 +35,7 @@ func NewKernelFactory(wgPort int) *KernelFactory {
 
 func (w *KernelFactory) GetProxy() Proxy {
 	if w.ebpfProxy == nil {
-		return udpProxy.NewWGUDPProxy(w.wgPort)
+		return udpProxy.NewWGUDPProxy(w.wgPort, w.mtu)
 	}
 
 	return ebpf.NewProxyWrapper(w.ebpfProxy)

client/iface/wgproxy/factory_kernel_freebsd.go

@@ -9,19 +9,21 @@ import (
 // KernelFactory todo: check eBPF support on FreeBSD
 type KernelFactory struct {
 	wgPort int
+	mtu    uint16
 }
 
-func NewKernelFactory(wgPort int) *KernelFactory {
+func NewKernelFactory(wgPort int, mtu uint16) *KernelFactory {
 	log.Infof("WireGuard Proxy Factory will produce UDP proxy")
 	f := &KernelFactory{
 		wgPort: wgPort,
+		mtu:    mtu,
 	}
 
 	return f
 }
 
 func (w *KernelFactory) GetProxy() Proxy {
-	return udpProxy.NewWGUDPProxy(w.wgPort)
+	return udpProxy.NewWGUDPProxy(w.wgPort, w.mtu)
 }
 
 func (w *KernelFactory) Free() error {

client/iface/wgproxy/proxy_linux_test.go

@@ -16,7 +16,7 @@ func TestProxyCloseByRemoteConnEBPF(t *testing.T) {
 	}
 	ctx := context.Background()
 
-	ebpfProxy := ebpf.NewWGEBPFProxy(51831)
+	ebpfProxy := ebpf.NewWGEBPFProxy(51831, 1280)
 	if err := ebpfProxy.Listen(); err != nil {
 		t.Fatalf("failed to initialize ebpf proxy: %s", err)
 	}

client/iface/wgproxy/proxy_test.go

@@ -84,12 +84,12 @@ func TestProxyCloseByRemoteConn(t *testing.T) {
 	}{
 		{
 			name:  "userspace proxy",
-			proxy: udpProxy.NewWGUDPProxy(51830),
+			proxy: udpProxy.NewWGUDPProxy(51830, 1280),
 		},
 	}
 
 	if runtime.GOOS == "linux" && os.Getenv("GITHUB_ACTIONS") != "true" {
-		ebpfProxy := ebpf.NewWGEBPFProxy(51831)
+		ebpfProxy := ebpf.NewWGEBPFProxy(51831, 1280)
 		if err := ebpfProxy.Listen(); err != nil {
 			t.Fatalf("failed to initialize ebpf proxy: %s", err)
 		}

client/iface/wgproxy/udp/proxy.go

@@ -12,12 +12,14 @@ import (
 	log "github.com/sirupsen/logrus"
 
 	cerrors "github.com/netbirdio/netbird/client/errors"
+	"github.com/netbirdio/netbird/client/iface/bufsize"
 	"github.com/netbirdio/netbird/client/iface/wgproxy/listener"
 )
 
 // WGUDPProxy proxies
 type WGUDPProxy struct {
 	localWGListenPort int
+	mtu               uint16
 
 	remoteConn net.Conn
 	localConn  net.Conn
@@ -34,10 +36,11 @@ type WGUDPProxy struct {
 }
 
 // NewWGUDPProxy instantiate a UDP based WireGuard proxy. This is not a thread safe implementation
-func NewWGUDPProxy(wgPort int) *WGUDPProxy {
+func NewWGUDPProxy(wgPort int, mtu uint16) *WGUDPProxy {
 	log.Debugf("Initializing new user space proxy with port %d", wgPort)
 	p := &WGUDPProxy{
 		localWGListenPort: wgPort,
+		mtu:               mtu,
 		closeListener:     listener.NewCloseListener(),
 	}
 	return p
@@ -144,7 +147,7 @@ func (p *WGUDPProxy) proxyToRemote(ctx context.Context) {
 		}
 	}()
 
-	buf := make([]byte, 1500)
+	buf := make([]byte, p.mtu+bufsize.WGBufferOverhead)
 	for ctx.Err() == nil {
 		n, err := p.localConn.Read(buf)
 		if err != nil {
@@ -179,7 +182,7 @@ func (p *WGUDPProxy) proxyToLocal(ctx context.Context) {
 		}
 	}()
 
-	buf := make([]byte, 1500)
+	buf := make([]byte, p.mtu+bufsize.WGBufferOverhead)
 	for {
 		n, err := p.remoteConnRead(ctx, buf)
 		if err != nil {

client/internal/connect.go

@@ -18,6 +18,7 @@ import (
 	"google.golang.org/grpc/codes"
 	gstatus "google.golang.org/grpc/status"
 
+	"github.com/netbirdio/netbird/client/iface"
 	"github.com/netbirdio/netbird/client/iface/device"
 	"github.com/netbirdio/netbird/client/internal/dns"
 	"github.com/netbirdio/netbird/client/internal/listener"
@@ -244,7 +245,15 @@ func (c *ConnectClient) run(mobileDependency MobileDependency, runningChan chan
 		c.statusRecorder.MarkSignalConnected()
 
 		relayURLs, token := parseRelayInfo(loginResp)
-		relayManager := relayClient.NewManager(engineCtx, relayURLs, myPrivateKey.PublicKey().String())
+		peerConfig := loginResp.GetPeerConfig()
+
+		engineConfig, err := createEngineConfig(myPrivateKey, c.config, peerConfig)
+		if err != nil {
+			log.Error(err)
+			return wrapErr(err)
+		}
+
+		relayManager := relayClient.NewManager(engineCtx, relayURLs, myPrivateKey.PublicKey().String(), engineConfig.MTU)
 		c.statusRecorder.SetRelayMgr(relayManager)
 		if len(relayURLs) > 0 {
 			if token != nil {
@@ -259,14 +268,6 @@ func (c *ConnectClient) run(mobileDependency MobileDependency, runningChan chan
 			}
 		}
 
-		peerConfig := loginResp.GetPeerConfig()
-
-		engineConfig, err := createEngineConfig(myPrivateKey, c.config, peerConfig)
-		if err != nil {
-			log.Error(err)
-			return wrapErr(err)
-		}
-
 		checks := loginResp.GetChecks()
 
 		c.engineMutex.Lock()
@@ -444,6 +445,8 @@ func createEngineConfig(key wgtypes.Key, config *profilemanager.Config, peerConf
 		BlockInbound:        config.BlockInbound,
 
 		LazyConnectionEnabled: config.LazyConnectionEnabled,
+
+		MTU: selectMTU(config.MTU, peerConfig.Mtu),
 	}
 
 	if config.PreSharedKey != "" {
@@ -466,6 +469,20 @@ func createEngineConfig(key wgtypes.Key, config *profilemanager.Config, peerConf
 	return engineConf, nil
 }
 
+func selectMTU(localMTU uint16, peerMTU int32) uint16 {
+	var finalMTU uint16 = iface.DefaultMTU
+	if localMTU > 0 {
+		finalMTU = localMTU
+	} else if peerMTU > 0 {
+		finalMTU = uint16(peerMTU)
+	}
+
+	// Set global DNS MTU
+	dns.SetCurrentMTU(finalMTU)
+
+	return finalMTU
+}
+
 // connectToSignal creates Signal Service client and established a connection
 func connectToSignal(ctx context.Context, wtConfig *mgmProto.NetbirdConfig, ourPrivateKey wgtypes.Key) (*signal.GrpcClient, error) {
 	var sigTLSEnabled bool

client/internal/dns/upstream.go

@@ -26,6 +26,12 @@ import (
 	"github.com/netbirdio/netbird/client/proto"
 )
 
+var currentMTU uint16 = iface.DefaultMTU
+
+func SetCurrentMTU(mtu uint16) {
+	currentMTU = mtu
+}
+
 const (
 	UpstreamTimeout = 15 * time.Second
 
@@ -358,8 +364,8 @@ func (u *upstreamResolverBase) testNameserver(server netip.AddrPort, timeout tim
 // If the passed context is nil, this will use Exchange instead of ExchangeContext.
 func ExchangeWithFallback(ctx context.Context, client *dns.Client, r *dns.Msg, upstream string) (*dns.Msg, time.Duration, error) {
 	// MTU - ip + udp headers
-	// Note: this could be sent out on an interface that is not ours, but our MTU should always be lower.
+	// Note: this could be sent out on an interface that is not ours, but higher MTU settings could break truncation handling.
-	client.UDPSize = iface.DefaultMTU - (60 + 8)
+	client.UDPSize = uint16(currentMTU - (60 + 8))
 
 	var (
 		rm  *dns.Msg

client/internal/engine.go

@@ -125,6 +125,8 @@ type EngineConfig struct {
 	BlockInbound        bool
 
 	LazyConnectionEnabled bool
+
+	MTU uint16
 }
 
 // Engine is a mechanism responsible for reacting on Signal and Management stream events and managing connections to the remote peers.
@@ -347,6 +349,10 @@ func (e *Engine) Start() error {
 	e.syncMsgMux.Lock()
 	defer e.syncMsgMux.Unlock()
 
+	if err := iface.ValidateMTU(e.config.MTU); err != nil {
+		return fmt.Errorf("invalid MTU configuration: %w", err)
+	}
+
 	if e.cancel != nil {
 		e.cancel()
 	}
@@ -1492,7 +1498,7 @@ func (e *Engine) newWgIface() (*iface.WGIface, error) {
 		Address:      e.config.WgAddr,
 		WGPort:       e.config.WgPort,
 		WGPrivKey:    e.config.WgPrivateKey.String(),
-		MTU:          iface.DefaultMTU,
+		MTU:          e.config.MTU,
 		TransportNet: transportNet,
 		FilterFn:     e.addrViaRoutes,
 		DisableDNS:   e.config.DisableDNS,

client/internal/engine_test.go

@@ -218,7 +218,7 @@ func TestEngine_SSH(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
-	relayMgr := relayClient.NewManager(ctx, nil, key.PublicKey().String())
+	relayMgr := relayClient.NewManager(ctx, nil, key.PublicKey().String(), iface.DefaultMTU)
 	engine := NewEngine(
 		ctx, cancel,
 		&signal.MockClient{},
@@ -230,6 +230,7 @@ func TestEngine_SSH(t *testing.T) {
 			WgPrivateKey:     key,
 			WgPort:           33100,
 			ServerSSHAllowed: true,
+			MTU:              iface.DefaultMTU,
 		},
 		MobileDependency{},
 		peer.NewRecorder("https://mgm"),
@@ -363,7 +364,7 @@ func TestEngine_UpdateNetworkMap(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
-	relayMgr := relayClient.NewManager(ctx, nil, key.PublicKey().String())
+	relayMgr := relayClient.NewManager(ctx, nil, key.PublicKey().String(), iface.DefaultMTU)
 	engine := NewEngine(
 		ctx, cancel,
 		&signal.MockClient{},
@@ -374,6 +375,7 @@ func TestEngine_UpdateNetworkMap(t *testing.T) {
 			WgAddr:       "100.64.0.1/24",
 			WgPrivateKey: key,
 			WgPort:       33100,
+			MTU:          iface.DefaultMTU,
 		},
 		MobileDependency{},
 		peer.NewRecorder("https://mgm"),
@@ -412,7 +414,7 @@ func TestEngine_UpdateNetworkMap(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	engine.udpMux = bind.NewUniversalUDPMuxDefault(bind.UniversalUDPMuxParams{UDPConn: conn})
+	engine.udpMux = bind.NewUniversalUDPMuxDefault(bind.UniversalUDPMuxParams{UDPConn: conn, MTU: 1280})
 	engine.ctx = ctx
 	engine.srWatcher = guard.NewSRWatcher(nil, nil, nil, icemaker.Config{})
 	engine.connMgr = NewConnMgr(engine.config, engine.statusRecorder, engine.peerStore, wgIface)
@@ -589,12 +591,13 @@ func TestEngine_Sync(t *testing.T) {
 		}
 		return nil
 	}
-	relayMgr := relayClient.NewManager(ctx, nil, key.PublicKey().String())
+	relayMgr := relayClient.NewManager(ctx, nil, key.PublicKey().String(), iface.DefaultMTU)
 	engine := NewEngine(ctx, cancel, &signal.MockClient{}, &mgmt.MockClient{SyncFunc: syncFunc}, relayMgr, &EngineConfig{
 		WgIfaceName:  "utun103",
 		WgAddr:       "100.64.0.1/24",
 		WgPrivateKey: key,
 		WgPort:       33100,
+		MTU:          iface.DefaultMTU,
 	}, MobileDependency{}, peer.NewRecorder("https://mgm"), nil)
 	engine.ctx = ctx
 
@@ -753,12 +756,13 @@ func TestEngine_UpdateNetworkMapWithRoutes(t *testing.T) {
 			wgIfaceName := fmt.Sprintf("utun%d", 104+n)
 			wgAddr := fmt.Sprintf("100.66.%d.1/24", n)
 
-			relayMgr := relayClient.NewManager(ctx, nil, key.PublicKey().String())
+			relayMgr := relayClient.NewManager(ctx, nil, key.PublicKey().String(), iface.DefaultMTU)
 			engine := NewEngine(ctx, cancel, &signal.MockClient{}, &mgmt.MockClient{}, relayMgr, &EngineConfig{
 				WgIfaceName:  wgIfaceName,
 				WgAddr:       wgAddr,
 				WgPrivateKey: key,
 				WgPort:       33100,
+				MTU:          iface.DefaultMTU,
 			}, MobileDependency{}, peer.NewRecorder("https://mgm"), nil)
 			engine.ctx = ctx
 			newNet, err := stdnet.NewNet()
@@ -954,12 +958,13 @@ func TestEngine_UpdateNetworkMapWithDNSUpdate(t *testing.T) {
 			wgIfaceName := fmt.Sprintf("utun%d", 104+n)
 			wgAddr := fmt.Sprintf("100.66.%d.1/24", n)
 
-			relayMgr := relayClient.NewManager(ctx, nil, key.PublicKey().String())
+			relayMgr := relayClient.NewManager(ctx, nil, key.PublicKey().String(), iface.DefaultMTU)
 			engine := NewEngine(ctx, cancel, &signal.MockClient{}, &mgmt.MockClient{}, relayMgr, &EngineConfig{
 				WgIfaceName:  wgIfaceName,
 				WgAddr:       wgAddr,
 				WgPrivateKey: key,
 				WgPort:       33100,
+				MTU:          iface.DefaultMTU,
 			}, MobileDependency{}, peer.NewRecorder("https://mgm"), nil)
 			engine.ctx = ctx
 
@@ -1181,6 +1186,7 @@ func Test_ParseNATExternalIPMappings(t *testing.T) {
 				config: &EngineConfig{
 					IFaceBlackList: testCase.inputBlacklistInterface,
 					NATExternalIPs: testCase.inputMapList,
+					MTU:            iface.DefaultMTU,
 				},
 			}
 			parsedList := engine.parseNATExternalIPMappings()
@@ -1481,9 +1487,10 @@ func createEngine(ctx context.Context, cancel context.CancelFunc, setupKey strin
 		WgAddr:       resp.PeerConfig.Address,
 		WgPrivateKey: key,
 		WgPort:       wgPort,
+		MTU:          iface.DefaultMTU,
 	}
 
-	relayMgr := relayClient.NewManager(ctx, nil, key.PublicKey().String())
+	relayMgr := relayClient.NewManager(ctx, nil, key.PublicKey().String(), iface.DefaultMTU)
 	e, err := NewEngine(ctx, cancel, signalClient, mgmtClient, relayMgr, conf, MobileDependency{}, peer.NewRecorder("https://mgm"), nil), nil
 	e.ctx = ctx
 	return e, err

client/internal/profilemanager/config.go

@@ -75,6 +75,8 @@ type ConfigInput struct {
 	DNSLabels domain.List
 
 	LazyConnectionEnabled *bool
+
+	MTU *uint16
 }
 
 // Config Configuration type
@@ -141,6 +143,8 @@ type Config struct {
 	ClientCertKeyPair *tls.Certificate `json:"-"`
 
 	LazyConnectionEnabled bool
+
+	MTU uint16
 }
 
 var ConfigDirOverride string
@@ -493,6 +497,16 @@ func (config *Config) apply(input ConfigInput) (updated bool, err error) {
 		updated = true
 	}
 
+	if input.MTU != nil && *input.MTU != config.MTU {
+		log.Infof("updating MTU to %d (old value %d)", *input.MTU, config.MTU)
+		config.MTU = *input.MTU
+		updated = true
+	} else if config.MTU == 0 {
+		config.MTU = iface.DefaultMTU
+		log.Infof("using default MTU %d", config.MTU)
+		updated = true
+	}
+
 	return updated, nil
 }
 

client/internal/routemanager/systemops/systemops_windows.go

@@ -336,7 +336,7 @@ func createIPForwardEntry2(route *MIB_IPFORWARD_ROW2) error {
 		if e1 != 0 {
 			return fmt.Errorf("CreateIpForwardEntry2: %w", e1)
 		}
-		return fmt.Errorf("CreateIpForwardEntry2: code %d", r1)
+		return fmt.Errorf("CreateIpForwardEntry2: code %d", windows.NTStatus(r1))
 	}
 	return nil
 }

client/proto/daemon.pb.go

@@ -278,6 +278,7 @@ type LoginRequest struct {
 	BlockInbound          *bool   `protobuf:"varint,29,opt,name=block_inbound,json=blockInbound,proto3,oneof" json:"block_inbound,omitempty"`
 	ProfileName           *string `protobuf:"bytes,30,opt,name=profileName,proto3,oneof" json:"profileName,omitempty"`
 	Username              *string `protobuf:"bytes,31,opt,name=username,proto3,oneof" json:"username,omitempty"`
+	Mtu                   *int64  `protobuf:"varint,32,opt,name=mtu,proto3,oneof" json:"mtu,omitempty"`
 	unknownFields         protoimpl.UnknownFields
 	sizeCache             protoimpl.SizeCache
 }
@@ -530,6 +531,13 @@ func (x *LoginRequest) GetUsername() string {
 	return ""
 }
 
+func (x *LoginRequest) GetMtu() int64 {
+	if x != nil && x.Mtu != nil {
+		return *x.Mtu
+	}
+	return 0
+}
+
 type LoginResponse struct {
 	state                   protoimpl.MessageState `protogen:"open.v1"`
 	NeedsSSOLogin           bool                   `protobuf:"varint,1,opt,name=needsSSOLogin,proto3" json:"needsSSOLogin,omitempty"`
@@ -1034,6 +1042,7 @@ type GetConfigResponse struct {
 	AdminURL              string `protobuf:"bytes,5,opt,name=adminURL,proto3" json:"adminURL,omitempty"`
 	InterfaceName         string `protobuf:"bytes,6,opt,name=interfaceName,proto3" json:"interfaceName,omitempty"`
 	WireguardPort         int64  `protobuf:"varint,7,opt,name=wireguardPort,proto3" json:"wireguardPort,omitempty"`
+	Mtu                   int64  `protobuf:"varint,8,opt,name=mtu,proto3" json:"mtu,omitempty"`
 	DisableAutoConnect    bool   `protobuf:"varint,9,opt,name=disableAutoConnect,proto3" json:"disableAutoConnect,omitempty"`
 	ServerSSHAllowed      bool   `protobuf:"varint,10,opt,name=serverSSHAllowed,proto3" json:"serverSSHAllowed,omitempty"`
 	RosenpassEnabled      bool   `protobuf:"varint,11,opt,name=rosenpassEnabled,proto3" json:"rosenpassEnabled,omitempty"`
@@ -1129,6 +1138,13 @@ func (x *GetConfigResponse) GetWireguardPort() int64 {
 	return 0
 }
 
+func (x *GetConfigResponse) GetMtu() int64 {
+	if x != nil {
+		return x.Mtu
+	}
+	return 0
+}
+
 func (x *GetConfigResponse) GetDisableAutoConnect() bool {
 	if x != nil {
 		return x.DisableAutoConnect
@@ -3679,6 +3695,7 @@ type SetConfigRequest struct {
 	// cleanDNSLabels clean map list of DNS labels.
 	CleanDNSLabels   bool                 `protobuf:"varint,26,opt,name=cleanDNSLabels,proto3" json:"cleanDNSLabels,omitempty"`
 	DnsRouteInterval *durationpb.Duration `protobuf:"bytes,27,opt,name=dnsRouteInterval,proto3,oneof" json:"dnsRouteInterval,omitempty"`
+	Mtu              *int64               `protobuf:"varint,28,opt,name=mtu,proto3,oneof" json:"mtu,omitempty"`
 	unknownFields    protoimpl.UnknownFields
 	sizeCache        protoimpl.SizeCache
 }
@@ -3902,6 +3919,13 @@ func (x *SetConfigRequest) GetDnsRouteInterval() *durationpb.Duration {
 	return nil
 }
 
+func (x *SetConfigRequest) GetMtu() int64 {
+	if x != nil && x.Mtu != nil {
+		return *x.Mtu
+	}
+	return 0
+}
+
 type SetConfigResponse struct {
 	state         protoimpl.MessageState `protogen:"open.v1"`
 	unknownFields protoimpl.UnknownFields
@@ -4575,7 +4599,7 @@ var File_daemon_proto protoreflect.FileDescriptor
 const file_daemon_proto_rawDesc = "" +
 	"\n" +
 	"\fdaemon.proto\x12\x06daemon\x1a google/protobuf/descriptor.proto\x1a\x1fgoogle/protobuf/timestamp.proto\x1a\x1egoogle/protobuf/duration.proto\"\x0e\n" +
-	"\fEmptyRequest\"\xa4\x0e\n" +
+	"\fEmptyRequest\"\xc3\x0e\n" +
 	"\fLoginRequest\x12\x1a\n" +
 	"\bsetupKey\x18\x01 \x01(\tR\bsetupKey\x12&\n" +
 	"\fpreSharedKey\x18\x02 \x01(\tB\x02\x18\x01R\fpreSharedKey\x12$\n" +
@@ -4611,7 +4635,8 @@ const file_daemon_proto_rawDesc = "" +
 	"\x15lazyConnectionEnabled\x18\x1c \x01(\bH\x0fR\x15lazyConnectionEnabled\x88\x01\x01\x12(\n" +
 	"\rblock_inbound\x18\x1d \x01(\bH\x10R\fblockInbound\x88\x01\x01\x12%\n" +
 	"\vprofileName\x18\x1e \x01(\tH\x11R\vprofileName\x88\x01\x01\x12\x1f\n" +
-	"\busername\x18\x1f \x01(\tH\x12R\busername\x88\x01\x01B\x13\n" +
+	"\busername\x18\x1f \x01(\tH\x12R\busername\x88\x01\x01\x12\x15\n" +
+	"\x03mtu\x18  \x01(\x03H\x13R\x03mtu\x88\x01\x01B\x13\n" +
 	"\x11_rosenpassEnabledB\x10\n" +
 	"\x0e_interfaceNameB\x10\n" +
 	"\x0e_wireguardPortB\x17\n" +
@@ -4630,7 +4655,8 @@ const file_daemon_proto_rawDesc = "" +
 	"\x16_lazyConnectionEnabledB\x10\n" +
 	"\x0e_block_inboundB\x0e\n" +
 	"\f_profileNameB\v\n" +
-	"\t_username\"\xb5\x01\n" +
+	"\t_usernameB\x06\n" +
+	"\x04_mtu\"\xb5\x01\n" +
 	"\rLoginResponse\x12$\n" +
 	"\rneedsSSOLogin\x18\x01 \x01(\bR\rneedsSSOLogin\x12\x1a\n" +
 	"\buserCode\x18\x02 \x01(\tR\buserCode\x12(\n" +
@@ -4661,7 +4687,7 @@ const file_daemon_proto_rawDesc = "" +
 	"\fDownResponse\"P\n" +
 	"\x10GetConfigRequest\x12 \n" +
 	"\vprofileName\x18\x01 \x01(\tR\vprofileName\x12\x1a\n" +
-	"\busername\x18\x02 \x01(\tR\busername\"\xa3\x06\n" +
+	"\busername\x18\x02 \x01(\tR\busername\"\xb5\x06\n" +
 	"\x11GetConfigResponse\x12$\n" +
 	"\rmanagementUrl\x18\x01 \x01(\tR\rmanagementUrl\x12\x1e\n" +
 	"\n" +
@@ -4671,7 +4697,8 @@ const file_daemon_proto_rawDesc = "" +
 	"\fpreSharedKey\x18\x04 \x01(\tR\fpreSharedKey\x12\x1a\n" +
 	"\badminURL\x18\x05 \x01(\tR\badminURL\x12$\n" +
 	"\rinterfaceName\x18\x06 \x01(\tR\rinterfaceName\x12$\n" +
-	"\rwireguardPort\x18\a \x01(\x03R\rwireguardPort\x12.\n" +
+	"\rwireguardPort\x18\a \x01(\x03R\rwireguardPort\x12\x10\n" +
+	"\x03mtu\x18\b \x01(\x03R\x03mtu\x12.\n" +
 	"\x12disableAutoConnect\x18\t \x01(\bR\x12disableAutoConnect\x12*\n" +
 	"\x10serverSSHAllowed\x18\n" +
 	" \x01(\bR\x10serverSSHAllowed\x12*\n" +
@@ -4885,7 +4912,7 @@ const file_daemon_proto_rawDesc = "" +
 	"\busername\x18\x02 \x01(\tH\x01R\busername\x88\x01\x01B\x0e\n" +
 	"\f_profileNameB\v\n" +
 	"\t_username\"\x17\n" +
-	"\x15SwitchProfileResponse\"\xef\f\n" +
+	"\x15SwitchProfileResponse\"\x8e\r\n" +
 	"\x10SetConfigRequest\x12\x1a\n" +
 	"\busername\x18\x01 \x01(\tR\busername\x12 \n" +
 	"\vprofileName\x18\x02 \x01(\tR\vprofileName\x12$\n" +
@@ -4917,7 +4944,8 @@ const file_daemon_proto_rawDesc = "" +
 	"\n" +
 	"dns_labels\x18\x19 \x03(\tR\tdnsLabels\x12&\n" +
 	"\x0ecleanDNSLabels\x18\x1a \x01(\bR\x0ecleanDNSLabels\x12J\n" +
-	"\x10dnsRouteInterval\x18\x1b \x01(\v2\x19.google.protobuf.DurationH\x10R\x10dnsRouteInterval\x88\x01\x01B\x13\n" +
+	"\x10dnsRouteInterval\x18\x1b \x01(\v2\x19.google.protobuf.DurationH\x10R\x10dnsRouteInterval\x88\x01\x01\x12\x15\n" +
+	"\x03mtu\x18\x1c \x01(\x03H\x11R\x03mtu\x88\x01\x01B\x13\n" +
 	"\x11_rosenpassEnabledB\x10\n" +
 	"\x0e_interfaceNameB\x10\n" +
 	"\x0e_wireguardPortB\x17\n" +
@@ -4934,7 +4962,8 @@ const file_daemon_proto_rawDesc = "" +
 	"\x16_disable_notificationsB\x18\n" +
 	"\x16_lazyConnectionEnabledB\x10\n" +
 	"\x0e_block_inboundB\x13\n" +
-	"\x11_dnsRouteInterval\"\x13\n" +
+	"\x11_dnsRouteIntervalB\x06\n" +
+	"\x04_mtu\"\x13\n" +
 	"\x11SetConfigResponse\"Q\n" +
 	"\x11AddProfileRequest\x12\x1a\n" +
 	"\busername\x18\x01 \x01(\tR\busername\x12 \n" +

client/proto/daemon.proto

@@ -156,6 +156,8 @@ message LoginRequest {
 
   optional string profileName = 30;
   optional string username = 31;
+
+  optional int64 mtu = 32;
 }
 
 message LoginResponse {
@@ -223,6 +225,8 @@ message GetConfigResponse {
 
   int64 wireguardPort = 7;
 
+  int64 mtu = 8;
+
   bool disableAutoConnect = 9;
 
   bool serverSSHAllowed = 10;
@@ -538,36 +542,36 @@ message SetConfigRequest {
     string profileName = 2;
     // managementUrl to authenticate.
     string managementUrl = 3;
-  
+
     // adminUrl to manage keys.
     string adminURL = 4;
-        
+
     optional bool rosenpassEnabled = 5;
-  
+
     optional string interfaceName = 6;
-  
+
     optional int64 wireguardPort = 7;
-  
+
     optional string optionalPreSharedKey = 8;
-  
+
     optional bool disableAutoConnect = 9;
-  
+
     optional bool serverSSHAllowed = 10;
-  
+
     optional bool rosenpassPermissive = 11;
-  
+
     optional bool networkMonitor = 12;
-  
+
     optional bool disable_client_routes = 13;
     optional bool disable_server_routes = 14;
     optional bool disable_dns = 15;
     optional bool disable_firewall = 16;
     optional bool block_lan_access = 17;
-  
+
     optional bool disable_notifications = 18;
-  
+
     optional bool lazyConnectionEnabled = 19;
-  
+
     optional bool block_inbound = 20;
 
     repeated string natExternalIPs = 21;
@@ -583,6 +587,7 @@ message SetConfigRequest {
 
     optional google.protobuf.Duration dnsRouteInterval = 27;
 
+    optional int64 mtu = 28;
 }
 
 message SetConfigResponse{}
@@ -633,4 +638,4 @@ message GetFeaturesRequest{}
 message GetFeaturesResponse{
   bool disable_profiles = 1;
   bool disable_update_settings = 2;
-}
+}

client/server/server.go

@@ -400,6 +400,11 @@ func (s *Server) SetConfig(callerCtx context.Context, msg *proto.SetConfigReques
 	config.LazyConnectionEnabled = msg.LazyConnectionEnabled
 	config.BlockInbound = msg.BlockInbound
 
+	if msg.Mtu != nil {
+		mtu := uint16(*msg.Mtu)
+		config.MTU = &mtu
+	}
+
 	if _, err := profilemanager.UpdateConfig(config); err != nil {
 		log.Errorf("failed to update profile config: %v", err)
 		return nil, fmt.Errorf("failed to update profile config: %w", err)
@@ -484,6 +489,7 @@ func (s *Server) Login(callerCtx context.Context, msg *proto.LoginRequest) (*pro
 		// nolint
 		ctx = context.WithValue(ctx, system.DeviceNameCtxKey, msg.Hostname)
 	}
+
 	s.mutex.Unlock()
 
 	config, err := s.getConfig(activeProf)
@@ -1105,6 +1111,7 @@ func (s *Server) GetConfig(ctx context.Context, req *proto.GetConfigRequest) (*p
 		AdminURL:              adminURL.String(),
 		InterfaceName:         cfg.WgIface,
 		WireguardPort:         int64(cfg.WgPort),
+		Mtu:                   int64(cfg.MTU),
 		DisableAutoConnect:    cfg.DisableAutoConnect,
 		ServerSSHAllowed:      *cfg.ServerSSHAllowed,
 		RosenpassEnabled:      cfg.RosenpassEnabled,

client/ui/client_ui.go

@@ -257,6 +257,7 @@ type serviceClient struct {
 	iPreSharedKey  *widget.Entry
 	iInterfaceName *widget.Entry
 	iInterfacePort *widget.Entry
+	iMTU           *widget.Entry
 
 	// switch elements for settings form
 	sRosenpassPermissive *widget.Check
@@ -272,6 +273,7 @@ type serviceClient struct {
 	RosenpassPermissive bool
 	interfaceName       string
 	interfacePort       int
+	mtu                 uint16
 	networkMonitor      bool
 	disableDNS          bool
 	disableClientRoutes bool
@@ -413,6 +415,7 @@ func (s *serviceClient) showSettingsUI() {
 	s.iPreSharedKey = widget.NewPasswordEntry()
 	s.iInterfaceName = widget.NewEntry()
 	s.iInterfacePort = widget.NewEntry()
+	s.iMTU = widget.NewEntry()
 
 	s.sRosenpassPermissive = widget.NewCheck("Enable Rosenpass permissive mode", nil)
 
@@ -446,6 +449,7 @@ func (s *serviceClient) getSettingsForm() *widget.Form {
 			{Text: "Quantum-Resistance", Widget: s.sRosenpassPermissive},
 			{Text: "Interface Name", Widget: s.iInterfaceName},
 			{Text: "Interface Port", Widget: s.iInterfacePort},
+			{Text: "MTU", Widget: s.iMTU},
 			{Text: "Management URL", Widget: s.iMngURL},
 			{Text: "Pre-shared Key", Widget: s.iPreSharedKey},
 			{Text: "Log File", Widget: s.iLogFile},
@@ -482,6 +486,21 @@ func (s *serviceClient) getSettingsForm() *widget.Form {
 				return
 			}
 
+			var mtu int64
+			mtuText := strings.TrimSpace(s.iMTU.Text)
+			if mtuText != "" {
+				var err error
+				mtu, err = strconv.ParseInt(mtuText, 10, 64)
+				if err != nil {
+					dialog.ShowError(errors.New("Invalid MTU value"), s.wSettings)
+					return
+				}
+				if mtu < iface.MinMTU || mtu > iface.MaxMTU {
+					dialog.ShowError(fmt.Errorf("MTU must be between %d and %d bytes", iface.MinMTU, iface.MaxMTU), s.wSettings)
+					return
+				}
+			}
+
 			iMngURL := strings.TrimSpace(s.iMngURL.Text)
 
 			defer s.wSettings.Close()
@@ -490,6 +509,7 @@ func (s *serviceClient) getSettingsForm() *widget.Form {
 			if s.managementURL != iMngURL || s.preSharedKey != s.iPreSharedKey.Text ||
 				s.RosenpassPermissive != s.sRosenpassPermissive.Checked ||
 				s.interfaceName != s.iInterfaceName.Text || s.interfacePort != int(port) ||
+				s.mtu != uint16(mtu) ||
 				s.networkMonitor != s.sNetworkMonitor.Checked ||
 				s.disableDNS != s.sDisableDNS.Checked ||
 				s.disableClientRoutes != s.sDisableClientRoutes.Checked ||
@@ -498,6 +518,7 @@ func (s *serviceClient) getSettingsForm() *widget.Form {
 
 				s.managementURL = iMngURL
 				s.preSharedKey = s.iPreSharedKey.Text
+				s.mtu = uint16(mtu)
 
 				currUser, err := user.Current()
 				if err != nil {
@@ -508,7 +529,7 @@ func (s *serviceClient) getSettingsForm() *widget.Form {
 				var req proto.SetConfigRequest
 				req.ProfileName = activeProf.Name
 				req.Username = currUser.Username
-
+				
 				if iMngURL != "" {
 					req.ManagementUrl = iMngURL
 				}
@@ -516,6 +537,9 @@ func (s *serviceClient) getSettingsForm() *widget.Form {
 				req.RosenpassPermissive = &s.sRosenpassPermissive.Checked
 				req.InterfaceName = &s.iInterfaceName.Text
 				req.WireguardPort = &port
+				if mtu > 0 {
+					req.Mtu = &mtu
+				}
 				req.NetworkMonitor = &s.sNetworkMonitor.Checked
 				req.DisableDns = &s.sDisableDNS.Checked
 				req.DisableClientRoutes = &s.sDisableClientRoutes.Checked
@@ -1088,6 +1112,7 @@ func (s *serviceClient) getSrvConfig() {
 	s.RosenpassPermissive = cfg.RosenpassPermissive
 	s.interfaceName = cfg.WgIface
 	s.interfacePort = cfg.WgPort
+	s.mtu = cfg.MTU
 
 	s.networkMonitor = *cfg.NetworkMonitor
 	s.disableDNS = cfg.DisableDNS
@@ -1100,6 +1125,12 @@ func (s *serviceClient) getSrvConfig() {
 		s.iPreSharedKey.SetText(cfg.PreSharedKey)
 		s.iInterfaceName.SetText(cfg.WgIface)
 		s.iInterfacePort.SetText(strconv.Itoa(cfg.WgPort))
+		if cfg.MTU != 0 {
+			s.iMTU.SetText(strconv.Itoa(int(cfg.MTU)))
+		} else {
+			s.iMTU.SetText("")
+			s.iMTU.SetPlaceHolder(strconv.Itoa(int(iface.DefaultMTU)))
+		}
 		s.sRosenpassPermissive.SetChecked(cfg.RosenpassPermissive)
 		if !cfg.RosenpassEnabled {
 			s.sRosenpassPermissive.Disable()
@@ -1160,6 +1191,12 @@ func protoConfigToConfig(cfg *proto.GetConfigResponse) *profilemanager.Config {
 		config.WgPort = iface.DefaultWgPort
 	}
 
+	if cfg.Mtu != 0 {
+		config.MTU = uint16(cfg.Mtu)
+	} else {
+		config.MTU = iface.DefaultMTU
+	}
+
 	config.DisableAutoConnect = cfg.DisableAutoConnect
 	config.ServerSSHAllowed = &cfg.ServerSSHAllowed
 	config.RosenpassEnabled = cfg.RosenpassEnabled

relay/test/benchmark_test.go

@@ -13,10 +13,11 @@ import (
 	"github.com/pion/logging"
 	"github.com/pion/turn/v3"
 
+	"github.com/netbirdio/netbird/client/iface"
+	"github.com/netbirdio/netbird/relay/server"
 	"github.com/netbirdio/netbird/shared/relay/auth/allow"
 	"github.com/netbirdio/netbird/shared/relay/auth/hmac"
 	"github.com/netbirdio/netbird/shared/relay/client"
-	"github.com/netbirdio/netbird/relay/server"
 	"github.com/netbirdio/netbird/util"
 )
 
@@ -100,7 +101,7 @@ func transfer(t *testing.T, testData []byte, peerPairs int) {
 
 	clientsSender := make([]*client.Client, peerPairs)
 	for i := 0; i < cap(clientsSender); i++ {
-		c := client.NewClient(serverConnURL, hmacTokenStore, "sender-"+fmt.Sprint(i))
+		c := client.NewClient(serverConnURL, hmacTokenStore, "sender-"+fmt.Sprint(i), iface.DefaultMTU)
 		err := c.Connect(ctx)
 		if err != nil {
 			t.Fatalf("failed to connect to server: %s", err)
@@ -110,7 +111,7 @@ func transfer(t *testing.T, testData []byte, peerPairs int) {
 
 	clientsReceiver := make([]*client.Client, peerPairs)
 	for i := 0; i < cap(clientsReceiver); i++ {
-		c := client.NewClient(serverConnURL, hmacTokenStore, "receiver-"+fmt.Sprint(i))
+		c := client.NewClient(serverConnURL, hmacTokenStore, "receiver-"+fmt.Sprint(i), iface.DefaultMTU)
 		err := c.Connect(ctx)
 		if err != nil {
 			t.Fatalf("failed to connect to server: %s", err)

relay/testec2/relay.go

@@ -11,6 +11,7 @@ import (
 
 	log "github.com/sirupsen/logrus"
 
+	"github.com/netbirdio/netbird/client/iface"
 	"github.com/netbirdio/netbird/shared/relay/auth/hmac"
 	"github.com/netbirdio/netbird/shared/relay/client"
 )
@@ -70,7 +71,7 @@ func prepareConnsSender(serverConnURL string, peerPairs int) []net.Conn {
 	ctx := context.Background()
 	clientsSender := make([]*client.Client, peerPairs)
 	for i := 0; i < cap(clientsSender); i++ {
-		c := client.NewClient(serverConnURL, hmacTokenStore, "sender-"+fmt.Sprint(i))
+		c := client.NewClient(serverConnURL, hmacTokenStore, "sender-"+fmt.Sprint(i), iface.DefaultMTU)
 		if err := c.Connect(ctx); err != nil {
 			log.Fatalf("failed to connect to server: %s", err)
 		}
@@ -156,7 +157,7 @@ func runReader(conn net.Conn) time.Duration {
 func prepareConnsReceiver(serverConnURL string, peerPairs int) []net.Conn {
 	clientsReceiver := make([]*client.Client, peerPairs)
 	for i := 0; i < cap(clientsReceiver); i++ {
-		c := client.NewClient(serverConnURL, hmacTokenStore, "receiver-"+fmt.Sprint(i))
+		c := client.NewClient(serverConnURL, hmacTokenStore, "receiver-"+fmt.Sprint(i), iface.DefaultMTU)
 		err := c.Connect(context.Background())
 		if err != nil {
 			log.Fatalf("failed to connect to server: %s", err)

shared/management/proto/management.pb.go

@@ -1,19 +1,18 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.26.0
-// 	protoc        v3.21.12
+// 	protoc        v4.24.3
 // source: management.proto
 
 package proto
 
 import (
-	reflect "reflect"
-	sync "sync"
-
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	durationpb "google.golang.org/protobuf/types/known/durationpb"
 	timestamppb "google.golang.org/protobuf/types/known/timestamppb"
+	reflect "reflect"
+	sync "sync"
 )
 
 const (
@@ -1650,6 +1649,7 @@ type PeerConfig struct {
 	Fqdn                            string `protobuf:"bytes,4,opt,name=fqdn,proto3" json:"fqdn,omitempty"`
 	RoutingPeerDnsResolutionEnabled bool   `protobuf:"varint,5,opt,name=RoutingPeerDnsResolutionEnabled,proto3" json:"RoutingPeerDnsResolutionEnabled,omitempty"`
 	LazyConnectionEnabled           bool   `protobuf:"varint,6,opt,name=LazyConnectionEnabled,proto3" json:"LazyConnectionEnabled,omitempty"`
+	Mtu                             int32  `protobuf:"varint,7,opt,name=mtu,proto3" json:"mtu,omitempty"`
 }
 
 func (x *PeerConfig) Reset() {
@@ -1726,6 +1726,13 @@ func (x *PeerConfig) GetLazyConnectionEnabled() bool {
 	return false
 }
 
+func (x *PeerConfig) GetMtu() int32 {
+	if x != nil {
+		return x.Mtu
+	}
+	return 0
+}
+
 // NetworkMap represents a network state of the peer with the corresponding configuration parameters to establish peer-to-peer connections
 type NetworkMap struct {
 	state         protoimpl.MessageState
@@ -3569,7 +3576,7 @@ var file_management_proto_rawDesc = []byte{
 	0x68, 0x6f, 0x73, 0x74, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x12, 0x0a, 0x04, 0x75, 0x73,
 	0x65, 0x72, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x75, 0x73, 0x65, 0x72, 0x12, 0x1a,
 	0x0a, 0x08, 0x70, 0x61, 0x73, 0x73, 0x77, 0x6f, 0x72, 0x64, 0x18, 0x03, 0x20, 0x01, 0x28, 0x09,
-	0x52, 0x08, 0x70, 0x61, 0x73, 0x73, 0x77, 0x6f, 0x72, 0x64, 0x22, 0x81, 0x02, 0x0a, 0x0a, 0x50,
+	0x52, 0x08, 0x70, 0x61, 0x73, 0x73, 0x77, 0x6f, 0x72, 0x64, 0x22, 0x93, 0x02, 0x0a, 0x0a, 0x50,
 	0x65, 0x65, 0x72, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x18, 0x0a, 0x07, 0x61, 0x64, 0x64,
 	0x72, 0x65, 0x73, 0x73, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x07, 0x61, 0x64, 0x64, 0x72,
 	0x65, 0x73, 0x73, 0x12, 0x10, 0x0a, 0x03, 0x64, 0x6e, 0x73, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09,
@@ -3585,296 +3592,297 @@ var file_management_proto_rawDesc = []byte{
 	0x6e, 0x45, 0x6e, 0x61, 0x62, 0x6c, 0x65, 0x64, 0x12, 0x34, 0x0a, 0x15, 0x4c, 0x61, 0x7a, 0x79,
 	0x43, 0x6f, 0x6e, 0x6e, 0x65, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x45, 0x6e, 0x61, 0x62, 0x6c, 0x65,
 	0x64, 0x18, 0x06, 0x20, 0x01, 0x28, 0x08, 0x52, 0x15, 0x4c, 0x61, 0x7a, 0x79, 0x43, 0x6f, 0x6e,
-	0x6e, 0x65, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x45, 0x6e, 0x61, 0x62, 0x6c, 0x65, 0x64, 0x22, 0xb9,
+	0x6e, 0x65, 0x63, 0x74, 0x69, 0x6f, 0x6e, 0x45, 0x6e, 0x61, 0x62, 0x6c, 0x65, 0x64, 0x12, 0x10,
-	0x05, 0x0a, 0x0a, 0x4e, 0x65, 0x74, 0x77, 0x6f, 0x72, 0x6b, 0x4d, 0x61, 0x70, 0x12, 0x16, 0x0a,
+	0x0a, 0x03, 0x6d, 0x74, 0x75, 0x18, 0x07, 0x20, 0x01, 0x28, 0x05, 0x52, 0x03, 0x6d, 0x74, 0x75,
-	0x06, 0x53, 0x65, 0x72, 0x69, 0x61, 0x6c, 0x18, 0x01, 0x20, 0x01, 0x28, 0x04, 0x52, 0x06, 0x53,
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-	0x12, 0x3d, 0x0a, 0x08, 0x53, 0x79, 0x6e, 0x63, 0x4d, 0x65, 0x74, 0x61, 0x12, 0x1c, 0x2e, 0x6d,
+	0x79, 0x70, 0x74, 0x65, 0x64, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x1a, 0x11, 0x2e, 0x6d,
-	0x61, 0x6e, 0x61, 0x67, 0x65, 0x6d, 0x65, 0x6e, 0x74, 0x2e, 0x45, 0x6e, 0x63, 0x72, 0x79, 0x70,
+	0x61, 0x6e, 0x61, 0x67, 0x65, 0x6d, 0x65, 0x6e, 0x74, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22,
-	0x74, 0x65, 0x64, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x1a, 0x11, 0x2e, 0x6d, 0x61, 0x6e,
+	0x00, 0x12, 0x3b, 0x0a, 0x06, 0x4c, 0x6f, 0x67, 0x6f, 0x75, 0x74, 0x12, 0x1c, 0x2e, 0x6d, 0x61,
-	0x61, 0x67, 0x65, 0x6d, 0x65, 0x6e, 0x74, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x12,
+	0x6e, 0x61, 0x67, 0x65, 0x6d, 0x65, 0x6e, 0x74, 0x2e, 0x45, 0x6e, 0x63, 0x72, 0x79, 0x70, 0x74,
-	0x3b, 0x0a, 0x06, 0x4c, 0x6f, 0x67, 0x6f, 0x75, 0x74, 0x12, 0x1c, 0x2e, 0x6d, 0x61, 0x6e, 0x61,
+	0x65, 0x64, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x1a, 0x11, 0x2e, 0x6d, 0x61, 0x6e, 0x61,
-	0x67, 0x65, 0x6d, 0x65, 0x6e, 0x74, 0x2e, 0x45, 0x6e, 0x63, 0x72, 0x79, 0x70, 0x74, 0x65, 0x64,
+	0x67, 0x65, 0x6d, 0x65, 0x6e, 0x74, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x42, 0x08,
-	0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x1a, 0x11, 0x2e, 0x6d, 0x61, 0x6e, 0x61, 0x67, 0x65,
+	0x5a, 0x06, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
-	0x6d, 0x65, 0x6e, 0x74, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x00, 0x42, 0x08, 0x5a, 0x06,
-	0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (

shared/management/proto/management.proto

@@ -264,6 +264,8 @@ message PeerConfig {
   bool RoutingPeerDnsResolutionEnabled = 5;
 
   bool LazyConnectionEnabled = 6;
+
+  int32 mtu = 7;
 }
 
 // NetworkMap represents a network state of the peer with the corresponding configuration parameters to establish peer-to-peer connections

shared/relay/client/client.go

@@ -9,6 +9,7 @@ import (
 
 	log "github.com/sirupsen/logrus"
 
+	"github.com/netbirdio/netbird/client/iface"
 	auth "github.com/netbirdio/netbird/shared/relay/auth/hmac"
 	"github.com/netbirdio/netbird/shared/relay/client/dialer"
 	"github.com/netbirdio/netbird/shared/relay/client/dialer/quic"
@@ -143,10 +144,12 @@ type Client struct {
 	listenerMutex        sync.Mutex
 
 	stateSubscription *PeersStateSubscription
+
+	mtu uint16
 }
 
 // NewClient creates a new client for the relay server. The client is not connected to the server until the Connect
-func NewClient(serverURL string, authTokenStore *auth.TokenStore, peerID string) *Client {
+func NewClient(serverURL string, authTokenStore *auth.TokenStore, peerID string, mtu uint16) *Client {
 	hashedID := messages.HashID(peerID)
 	relayLog := log.WithFields(log.Fields{"relay": serverURL})
 
@@ -155,6 +158,7 @@ func NewClient(serverURL string, authTokenStore *auth.TokenStore, peerID string)
 		connectionURL:  serverURL,
 		authTokenStore: authTokenStore,
 		hashedID:       hashedID,
+		mtu:            mtu,
 		bufPool: &sync.Pool{
 			New: func() any {
 				buf := make([]byte, bufferSize)
@@ -292,7 +296,16 @@ func (c *Client) Close() error {
 }
 
 func (c *Client) connect(ctx context.Context) (*RelayAddr, error) {
-	rd := dialer.NewRaceDial(c.log, dialer.DefaultConnectionTimeout, c.connectionURL, quic.Dialer{}, ws.Dialer{})
+	// Force WebSocket for MTUs larger than default to avoid QUIC DATAGRAM frame size issues
+	var dialers []dialer.DialeFn
+	if c.mtu > 0 && c.mtu > iface.DefaultMTU {
+		c.log.Infof("MTU %d exceeds default (%d), forcing WebSocket transport to avoid DATAGRAM frame size issues", c.mtu, iface.DefaultMTU)
+		dialers = []dialer.DialeFn{ws.Dialer{}}
+	} else {
+		dialers = []dialer.DialeFn{quic.Dialer{}, ws.Dialer{}}
+	}
+
+	rd := dialer.NewRaceDial(c.log, dialer.DefaultConnectionTimeout, c.connectionURL, dialers...)
 	conn, err := rd.Dial()
 	if err != nil {
 		return nil, err

shared/relay/client/client_test.go

@@ -10,6 +10,7 @@ import (
 	log "github.com/sirupsen/logrus"
 	"go.opentelemetry.io/otel"
 
+	"github.com/netbirdio/netbird/client/iface"
 	"github.com/netbirdio/netbird/shared/relay/auth/allow"
 	"github.com/netbirdio/netbird/shared/relay/auth/hmac"
 	"github.com/netbirdio/netbird/util"
@@ -63,7 +64,7 @@ func TestClient(t *testing.T) {
 		t.Fatalf("failed to start server: %s", err)
 	}
 	t.Log("alice connecting to server")
-	clientAlice := NewClient(serverURL, hmacTokenStore, "alice")
+	clientAlice := NewClient(serverURL, hmacTokenStore, "alice", iface.DefaultMTU)
 	err = clientAlice.Connect(ctx)
 	if err != nil {
 		t.Fatalf("failed to connect to server: %s", err)
@@ -71,7 +72,7 @@ func TestClient(t *testing.T) {
 	defer clientAlice.Close()
 
 	t.Log("placeholder connecting to server")
-	clientPlaceHolder := NewClient(serverURL, hmacTokenStore, "clientPlaceHolder")
+	clientPlaceHolder := NewClient(serverURL, hmacTokenStore, "clientPlaceHolder", iface.DefaultMTU)
 	err = clientPlaceHolder.Connect(ctx)
 	if err != nil {
 		t.Fatalf("failed to connect to server: %s", err)
@@ -79,7 +80,7 @@ func TestClient(t *testing.T) {
 	defer clientPlaceHolder.Close()
 
 	t.Log("Bob connecting to server")
-	clientBob := NewClient(serverURL, hmacTokenStore, "bob")
+	clientBob := NewClient(serverURL, hmacTokenStore, "bob", iface.DefaultMTU)
 	err = clientBob.Connect(ctx)
 	if err != nil {
 		t.Fatalf("failed to connect to server: %s", err)
@@ -137,7 +138,7 @@ func TestRegistration(t *testing.T) {
 		t.Fatalf("failed to start server: %s", err)
 	}
 
-	clientAlice := NewClient(serverURL, hmacTokenStore, "alice")
+	clientAlice := NewClient(serverURL, hmacTokenStore, "alice", iface.DefaultMTU)
 	err = clientAlice.Connect(ctx)
 	if err != nil {
 		_ = srv.Shutdown(ctx)
@@ -177,7 +178,7 @@ func TestRegistrationTimeout(t *testing.T) {
 		_ = fakeTCPListener.Close()
 	}(fakeTCPListener)
 
-	clientAlice := NewClient("127.0.0.1:1234", hmacTokenStore, "alice")
+	clientAlice := NewClient("127.0.0.1:1234", hmacTokenStore, "alice", iface.DefaultMTU)
 	err = clientAlice.Connect(ctx)
 	if err == nil {
 		t.Errorf("failed to connect to server: %s", err)
@@ -218,7 +219,7 @@ func TestEcho(t *testing.T) {
 		t.Fatalf("failed to start server: %s", err)
 	}
 
-	clientAlice := NewClient(serverURL, hmacTokenStore, idAlice)
+	clientAlice := NewClient(serverURL, hmacTokenStore, idAlice, iface.DefaultMTU)
 	err = clientAlice.Connect(ctx)
 	if err != nil {
 		t.Fatalf("failed to connect to server: %s", err)
@@ -230,7 +231,7 @@ func TestEcho(t *testing.T) {
 		}
 	}()
 
-	clientBob := NewClient(serverURL, hmacTokenStore, idBob)
+	clientBob := NewClient(serverURL, hmacTokenStore, idBob, iface.DefaultMTU)
 	err = clientBob.Connect(ctx)
 	if err != nil {
 		t.Fatalf("failed to connect to server: %s", err)
@@ -308,7 +309,7 @@ func TestBindToUnavailabePeer(t *testing.T) {
 		t.Fatalf("failed to start server: %s", err)
 	}
 
-	clientAlice := NewClient(serverURL, hmacTokenStore, "alice")
+	clientAlice := NewClient(serverURL, hmacTokenStore, "alice", iface.DefaultMTU)
 	err = clientAlice.Connect(ctx)
 	if err != nil {
 		t.Errorf("failed to connect to server: %s", err)
@@ -354,13 +355,13 @@ func TestBindReconnect(t *testing.T) {
 		t.Fatalf("failed to start server: %s", err)
 	}
 
-	clientAlice := NewClient(serverURL, hmacTokenStore, "alice")
+	clientAlice := NewClient(serverURL, hmacTokenStore, "alice", iface.DefaultMTU)
 	err = clientAlice.Connect(ctx)
 	if err != nil {
 		t.Fatalf("failed to connect to server: %s", err)
 	}
 
-	clientBob := NewClient(serverURL, hmacTokenStore, "bob")
+	clientBob := NewClient(serverURL, hmacTokenStore, "bob", iface.DefaultMTU)
 	err = clientBob.Connect(ctx)
 	if err != nil {
 		t.Errorf("failed to connect to server: %s", err)
@@ -382,7 +383,7 @@ func TestBindReconnect(t *testing.T) {
 		t.Errorf("failed to close client: %s", err)
 	}
 
-	clientAlice = NewClient(serverURL, hmacTokenStore, "alice")
+	clientAlice = NewClient(serverURL, hmacTokenStore, "alice", iface.DefaultMTU)
 	err = clientAlice.Connect(ctx)
 	if err != nil {
 		t.Errorf("failed to connect to server: %s", err)
@@ -455,13 +456,13 @@ func TestCloseConn(t *testing.T) {
 		t.Fatalf("failed to start server: %s", err)
 	}
 
-	bob := NewClient(serverURL, hmacTokenStore, "bob")
+	bob := NewClient(serverURL, hmacTokenStore, "bob", iface.DefaultMTU)
 	err = bob.Connect(ctx)
 	if err != nil {
 		t.Errorf("failed to connect to server: %s", err)
 	}
 
-	clientAlice := NewClient(serverURL, hmacTokenStore, "alice")
+	clientAlice := NewClient(serverURL, hmacTokenStore, "alice", iface.DefaultMTU)
 	err = clientAlice.Connect(ctx)
 	if err != nil {
 		t.Errorf("failed to connect to server: %s", err)
@@ -517,13 +518,13 @@ func TestCloseRelayConn(t *testing.T) {
 		t.Fatalf("failed to start server: %s", err)
 	}
 
-	bob := NewClient(serverURL, hmacTokenStore, "bob")
+	bob := NewClient(serverURL, hmacTokenStore, "bob", iface.DefaultMTU)
 	err = bob.Connect(ctx)
 	if err != nil {
 		t.Fatalf("failed to connect to server: %s", err)
 	}
 
-	clientAlice := NewClient(serverURL, hmacTokenStore, "alice")
+	clientAlice := NewClient(serverURL, hmacTokenStore, "alice", iface.DefaultMTU)
 	err = clientAlice.Connect(ctx)
 	if err != nil {
 		t.Fatalf("failed to connect to server: %s", err)
@@ -571,7 +572,7 @@ func TestCloseByServer(t *testing.T) {
 
 	idAlice := "alice"
 	log.Debugf("connect by alice")
-	relayClient := NewClient(serverURL, hmacTokenStore, idAlice)
+	relayClient := NewClient(serverURL, hmacTokenStore, idAlice, iface.DefaultMTU)
 	if err = relayClient.Connect(ctx); err != nil {
 		log.Fatalf("failed to connect to server: %s", err)
 	}
@@ -627,7 +628,7 @@ func TestCloseByClient(t *testing.T) {
 
 	idAlice := "alice"
 	log.Debugf("connect by alice")
-	relayClient := NewClient(serverURL, hmacTokenStore, idAlice)
+	relayClient := NewClient(serverURL, hmacTokenStore, idAlice, iface.DefaultMTU)
 	err = relayClient.Connect(ctx)
 	if err != nil {
 		log.Fatalf("failed to connect to server: %s", err)
@@ -678,7 +679,7 @@ func TestCloseNotDrainedChannel(t *testing.T) {
 		t.Fatalf("failed to start server: %s", err)
 	}
 
-	clientAlice := NewClient(serverURL, hmacTokenStore, idAlice)
+	clientAlice := NewClient(serverURL, hmacTokenStore, idAlice, iface.DefaultMTU)
 	err = clientAlice.Connect(ctx)
 	if err != nil {
 		t.Fatalf("failed to connect to server: %s", err)
@@ -690,7 +691,7 @@ func TestCloseNotDrainedChannel(t *testing.T) {
 		}
 	}()
 
-	clientBob := NewClient(serverURL, hmacTokenStore, idBob)
+	clientBob := NewClient(serverURL, hmacTokenStore, idBob, iface.DefaultMTU)
 	err = clientBob.Connect(ctx)
 	if err != nil {
 		t.Fatalf("failed to connect to server: %s", err)

shared/relay/client/manager.go

@@ -63,20 +63,24 @@ type Manager struct {
 	onDisconnectedListeners map[string]*list.List
 	onReconnectedListenerFn func()
 	listenerLock            sync.Mutex
+
+	mtu uint16
 }
 
 // NewManager creates a new manager instance.
 // The serverURL address can be empty. In this case, the manager will not serve.
-func NewManager(ctx context.Context, serverURLs []string, peerID string) *Manager {
+func NewManager(ctx context.Context, serverURLs []string, peerID string, mtu uint16) *Manager {
 	tokenStore := &relayAuth.TokenStore{}
 
 	m := &Manager{
 		ctx:        ctx,
 		peerID:     peerID,
 		tokenStore: tokenStore,
+		mtu:        mtu,
 		serverPicker: &ServerPicker{
 			TokenStore: tokenStore,
 			PeerID:     peerID,
+			MTU:        mtu,
 		},
 		relayClients:            make(map[string]*RelayTrack),
 		onDisconnectedListeners: make(map[string]*list.List),
@@ -253,7 +257,7 @@ func (m *Manager) openConnVia(ctx context.Context, serverAddress, peerKey string
 	m.relayClients[serverAddress] = rt
 	m.relayClientsMutex.Unlock()
 
-	relayClient := NewClient(serverAddress, m.tokenStore, m.peerID)
+	relayClient := NewClient(serverAddress, m.tokenStore, m.peerID, m.mtu)
 	err := relayClient.Connect(m.ctx)
 	if err != nil {
 		rt.err = err

shared/relay/client/manager_test.go

@@ -8,14 +8,15 @@ import (
 	log "github.com/sirupsen/logrus"
 	"go.opentelemetry.io/otel"
 
-	"github.com/netbirdio/netbird/shared/relay/auth/allow"
+	"github.com/netbirdio/netbird/client/iface"
 	"github.com/netbirdio/netbird/relay/server"
+	"github.com/netbirdio/netbird/shared/relay/auth/allow"
 )
 
 func TestEmptyURL(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	mgr := NewManager(ctx, nil, "alice")
+	mgr := NewManager(ctx, nil, "alice", iface.DefaultMTU)
 	err := mgr.Serve()
 	if err == nil {
 		t.Errorf("expected error, got nil")
@@ -90,12 +91,12 @@ func TestForeignConn(t *testing.T) {
 
 	mCtx, cancel := context.WithCancel(ctx)
 	defer cancel()
-	clientAlice := NewManager(mCtx, toURL(lstCfg1), "alice")
+	clientAlice := NewManager(mCtx, toURL(lstCfg1), "alice", iface.DefaultMTU)
 	if err := clientAlice.Serve(); err != nil {
 		t.Fatalf("failed to serve manager: %s", err)
 	}
 
-	clientBob := NewManager(mCtx, toURL(srvCfg2), "bob")
+	clientBob := NewManager(mCtx, toURL(srvCfg2), "bob", iface.DefaultMTU)
 	if err := clientBob.Serve(); err != nil {
 		t.Fatalf("failed to serve manager: %s", err)
 	}
@@ -197,12 +198,12 @@ func TestForeginConnClose(t *testing.T) {
 	mCtx, cancel := context.WithCancel(ctx)
 	defer cancel()
 
-	mgrBob := NewManager(mCtx, toURL(srvCfg2), "bob")
+	mgrBob := NewManager(mCtx, toURL(srvCfg2), "bob", iface.DefaultMTU)
 	if err := mgrBob.Serve(); err != nil {
 		t.Fatalf("failed to serve manager: %s", err)
 	}
 
-	mgr := NewManager(mCtx, toURL(srvCfg1), "alice")
+	mgr := NewManager(mCtx, toURL(srvCfg1), "alice", iface.DefaultMTU)
 	err = mgr.Serve()
 	if err != nil {
 		t.Fatalf("failed to serve manager: %s", err)
@@ -282,7 +283,7 @@ func TestForeignAutoClose(t *testing.T) {
 	t.Log("connect to server 1.")
 	mCtx, cancel := context.WithCancel(ctx)
 	defer cancel()
-	mgr := NewManager(mCtx, toURL(srvCfg1), idAlice)
+	mgr := NewManager(mCtx, toURL(srvCfg1), idAlice, iface.DefaultMTU)
 	err = mgr.Serve()
 	if err != nil {
 		t.Fatalf("failed to serve manager: %s", err)
@@ -353,13 +354,13 @@ func TestAutoReconnect(t *testing.T) {
 	mCtx, cancel := context.WithCancel(ctx)
 	defer cancel()
 
-	clientBob := NewManager(mCtx, toURL(srvCfg), "bob")
+	clientBob := NewManager(mCtx, toURL(srvCfg), "bob", iface.DefaultMTU)
 	err = clientBob.Serve()
 	if err != nil {
 		t.Fatalf("failed to serve manager: %s", err)
 	}
 
-	clientAlice := NewManager(mCtx, toURL(srvCfg), "alice")
+	clientAlice := NewManager(mCtx, toURL(srvCfg), "alice", iface.DefaultMTU)
 	err = clientAlice.Serve()
 	if err != nil {
 		t.Fatalf("failed to serve manager: %s", err)
@@ -428,12 +429,12 @@ func TestNotifierDoubleAdd(t *testing.T) {
 	mCtx, cancel := context.WithCancel(ctx)
 	defer cancel()
 
-	clientBob := NewManager(mCtx, toURL(listenerCfg1), "bob")
+	clientBob := NewManager(mCtx, toURL(listenerCfg1), "bob", iface.DefaultMTU)
 	if err = clientBob.Serve(); err != nil {
 		t.Fatalf("failed to serve manager: %s", err)
 	}
 
-	clientAlice := NewManager(mCtx, toURL(listenerCfg1), "alice")
+	clientAlice := NewManager(mCtx, toURL(listenerCfg1), "alice", iface.DefaultMTU)
 	if err = clientAlice.Serve(); err != nil {
 		t.Fatalf("failed to serve manager: %s", err)
 	}

shared/relay/client/picker.go

@@ -30,6 +30,7 @@ type ServerPicker struct {
 	TokenStore *auth.TokenStore
 	ServerURLs atomic.Value
 	PeerID     string
+	MTU        uint16
 }
 
 func (sp *ServerPicker) PickServer(parentCtx context.Context) (*Client, error) {
@@ -70,7 +71,7 @@ func (sp *ServerPicker) PickServer(parentCtx context.Context) (*Client, error) {
 
 func (sp *ServerPicker) startConnection(ctx context.Context, resultChan chan connResult, url string) {
 	log.Infof("try to connecting to relay server: %s", url)
-	relayClient := NewClient(url, sp.TokenStore, sp.PeerID)
+	relayClient := NewClient(url, sp.TokenStore, sp.PeerID, sp.MTU)
 	err := relayClient.Connect(ctx)
 	resultChan <- connResult{
 		RelayClient: relayClient,

sharedsock/example/main.go

@@ -5,14 +5,16 @@ import (
 	"os"
 	"os/signal"
 
-	"github.com/netbirdio/netbird/sharedsock"
 	log "github.com/sirupsen/logrus"
+
+	"github.com/netbirdio/netbird/client/iface"
+	"github.com/netbirdio/netbird/sharedsock"
 )
 
 func main() {
 
 	port := 51820
-	rawSock, err := sharedsock.Listen(port, sharedsock.NewIncomingSTUNFilter())
+	rawSock, err := sharedsock.Listen(port, sharedsock.NewIncomingSTUNFilter(), iface.DefaultMTU)
 	if err != nil {
 		panic(err)
 	}

sharedsock/sock_linux.go

@@ -36,6 +36,7 @@ type SharedSocket struct {
 	conn4       *socket.Conn
 	conn6       *socket.Conn
 	port        int
+	mtu         uint16
 	routerMux   sync.RWMutex
 	router      routing.Router
 	packetDemux chan rcvdPacket
@@ -56,12 +57,19 @@ var writeSerializerOptions = gopacket.SerializeOptions{
 	FixLengths:       true,
 }
 
+// Maximum overhead for IP + UDP headers on raw socket
+// IPv4: max 60 bytes (20 base + 40 options) + UDP 8 bytes = 68 bytes
+// IPv6: 40 bytes + UDP 8 bytes = 48 bytes
+// We use the maximum (68) for both IPv4 and IPv6
+const maxIPUDPOverhead = 68
+
 // Listen creates an IPv4 and IPv6 raw sockets, starts a reader and routing table routines
-func Listen(port int, filter BPFFilter) (_ net.PacketConn, err error) {
+func Listen(port int, filter BPFFilter, mtu uint16) (_ net.PacketConn, err error) {
 	ctx, cancel := context.WithCancel(context.Background())
 	rawSock := &SharedSocket{
 		ctx:         ctx,
 		cancel:      cancel,
+		mtu:         mtu,
 		port:        port,
 		packetDemux: make(chan rcvdPacket),
 	}
@@ -222,8 +230,10 @@ func (s *SharedSocket) Close() error {
 
 // read start a read loop for a specific receiver and sends the packet to the packetDemux channel
 func (s *SharedSocket) read(receiver receiver) {
+	// Buffer reuse is safe: packetDemux is unbuffered, so read() blocks until
+	// ReadFrom() synchronously processes the packet before next iteration
+	buf := make([]byte, s.mtu+maxIPUDPOverhead)
 	for {
-		buf := make([]byte, 1500)
 		n, addr, err := receiver(s.ctx, buf, 0)
 		select {
 		case <-s.ctx.Done():

sharedsock/sock_linux_test.go

@@ -21,7 +21,7 @@ func TestShouldReadSTUNOnReadFrom(t *testing.T) {
 
 	// create raw socket on a port
 	testingPort := 51821
-	rawSock, err := Listen(testingPort, NewIncomingSTUNFilter())
+	rawSock, err := Listen(testingPort, NewIncomingSTUNFilter(), 1280)
 	require.NoError(t, err, "received an error while creating STUN listener, error: %s", err)
 	err = rawSock.SetReadDeadline(time.Now().Add(3 * time.Second))
 	require.NoError(t, err, "unable to set deadline, error: %s", err)
@@ -76,7 +76,7 @@ func TestShouldReadSTUNOnReadFrom(t *testing.T) {
 
 func TestShouldNotReadNonSTUNPackets(t *testing.T) {
 	testingPort := 39439
-	rawSock, err := Listen(testingPort, NewIncomingSTUNFilter())
+	rawSock, err := Listen(testingPort, NewIncomingSTUNFilter(), 1280)
 	require.NoError(t, err, "received an error while creating STUN listener, error: %s", err)
 	defer rawSock.Close()
 
@@ -110,7 +110,7 @@ func TestWriteTo(t *testing.T) {
 	defer udpListener.Close()
 
 	testingPort := 39440
-	rawSock, err := Listen(testingPort, NewIncomingSTUNFilter())
+	rawSock, err := Listen(testingPort, NewIncomingSTUNFilter(), 1280)
 	require.NoError(t, err, "received an error while creating STUN listener, error: %s", err)
 	defer rawSock.Close()
 
@@ -144,7 +144,7 @@ func TestWriteTo(t *testing.T) {
 }
 
 func TestSharedSocket_Close(t *testing.T) {
-	rawSock, err := Listen(39440, NewIncomingSTUNFilter())
+	rawSock, err := Listen(39440, NewIncomingSTUNFilter(), 1280)
 	require.NoError(t, err, "received an error while creating STUN listener, error: %s", err)
 
 	errGrp := errgroup.Group{}

sharedsock/sock_nolinux.go

@@ -9,6 +9,6 @@ import (
 )
 
 // Listen is not supported on other platforms then Linux
-func Listen(port int, filter BPFFilter) (net.PacketConn, error) {
+func Listen(port int, filter BPFFilter, mtu uint16) (net.PacketConn, error) {
 	return nil, fmt.Errorf("not supported OS %s. SharedSocket is only supported on Linux", runtime.GOOS)
 }