SVI/netbird
1
0
Fork 0
mirror of https://github.com/netbirdio/netbird.git synced 2026-05-16 13:12:11 -04:00
Code Issues 3.0k Packages Projects Releases 10 Wiki Activity

Allow MTU configuration for Peers #1543

New Issue
Open
opened 2025-11-20 05:32:31 -05:00 by saavagebueno · 2 comments
saavagebueno commented 2025-11-20 05:32:31 -05:00
Owner
Copy Link

Originally created by @PapaZigE on GitHub (Jan 4, 2025).

Is your feature request related to a problem? Please describe.
Yes. It's related to this Issue here: MTU configuration.

My peer server running services like Odoo, OneDev and Nextcloud fails to send SMTP due to MTU defaults being too low. They work properly for http requests, but ALL of them fail SMTP. After changing the interface MTU, everything worked again.

However, if I down and up netbird, it changes the MTU back to defaults. So even if I persist the changes at the server level, a Netbird restart will revert the changes. Note, All my services are in docker.

Describe the solution you'd like
Therefore, the ability to change the default config.json values and include an MTU option for peers would be extremely beneficial. Currently, if I add MTU to the config.json like this:

    "MTU": 1500,
    "WgIface": "wt0",
    "WgPort": 51820,
    "NetworkMonitor": null,
    "IFaceBlackList": [
        "wt0",
        "wt",
        "utun",
        "tun0",
        "zt",
        "ZeroTier",
        "wg",
        "ts",
        "Tailscale",
        "tailscale",
        "docker",
        "veth",
        "br-",
        "lo"
    ],

Netbird still does not pick it up. I can change the MTU with ip link but there's no way to persist it which is a problem because multiple services rely on the MTU setting as I have found out after a lot of troubleshooting. Although I can change it manually, it is not practical to instruct every peer that connects to change their interface MTU's. Peers are mixed between multiple clients like Windows, Mac, iPhone and Android. A default setting in the config and a way to have that config passed to the peers is the request.

Describe alternatives you've considered

  • Manually setting interface MTU in config: does not work
  • Manually setting interface MTU with ip link: works but does not persist on Netbird restart.
Originally created by @PapaZigE on GitHub (Jan 4, 2025). **Is your feature request related to a problem? Please describe.** Yes. It's related to this Issue here: [MTU configuration](https://github.com/netbirdio/netbird/issues/743). My peer server running services like Odoo, OneDev and Nextcloud fails to send SMTP due to MTU defaults being too low. They work properly for http requests, but ALL of them fail SMTP. After changing the interface MTU, everything worked again. However, if I down and up netbird, it changes the MTU back to defaults. So even if I persist the changes at the server level, a Netbird restart will revert the changes. Note, All my services are in docker. **Describe the solution you'd like** Therefore, the ability to change the default config.json values and include an MTU option for peers would be extremely beneficial. Currently, if I add MTU to the config.json like this: ``` "MTU": 1500, "WgIface": "wt0", "WgPort": 51820, "NetworkMonitor": null, "IFaceBlackList": [ "wt0", "wt", "utun", "tun0", "zt", "ZeroTier", "wg", "ts", "Tailscale", "tailscale", "docker", "veth", "br-", "lo" ], ``` Netbird still does not pick it up. I can change the MTU with `ip link` but there's no way to persist it which is a problem because multiple services rely on the MTU setting as I have found out after a lot of troubleshooting. Although I can change it manually, it is not practical to instruct every peer that connects to change their interface MTU's. Peers are mixed between multiple clients like Windows, Mac, iPhone and Android. A default setting in the config and a way to have that config passed to the peers is the request. **Describe alternatives you've considered** - Manually setting interface MTU in config: does not work - Manually setting interface MTU with ip link: works but does not persist on Netbird restart.
saavagebueno added the feature-requestclient labels 2025-11-20 05:32:31 -05:00
saavagebueno commented 2025-11-20 05:32:32 -05:00
Author
Owner
Copy Link

@e1ke commented on GitHub (Jun 12, 2025):

related to feature-request https://github.com/netbirdio/netbird/issues/743

@e1ke commented on GitHub (Jun 12, 2025): related to feature-request https://github.com/netbirdio/netbird/issues/743
saavagebueno commented 2025-11-20 05:32:32 -05:00
Author
Owner
Copy Link

@e1ke commented on GitHub (Jul 28, 2025):

related to PR https://github.com/netbirdio/netbird/pull/4213

@e1ke commented on GitHub (Jul 28, 2025): related to PR https://github.com/netbirdio/netbird/pull/4213
Sign in to join this conversation.
No Branch/Tag Specified
Branches Tags
Labels
Clear labels
2021 Q4
2022 Q1
2022 Q1
accessibility
acl
agent
agent
Android
Android
api
authentik
automation
azure
battery-usage
bug
cache
client
client-ui
cloud
cloud-only
cloudflare
community
compatibility
config-idp
config-issue
connection
contribution
coturn
cross-vpn
dashboard
data-usage
distribution
dns
docker
documentation
duplicate
enhancement
enhancement
event-stream
feature-request
freebsd
getting-started
go
good first issue
gui
help wanted
home-assistant
idp
inconsistency
integration
integrations
ios
ipv6
jwt
k8s
keycloak
linux
login
macos
management-service
missing-docs
mobile
moved-internal
needs-review
netbird-ui
networking
new-platform
nginx
notification
okta
openwrt
packaging
peer-management
peer-management
peer-management
performance
postgres
posture-checks
psk
pull-request
Mirrored from GitHub Pull Request
 question
refactor
relay
release
rfc
routes
security
security-related
self-hosting
server
signal
sleep-issue
ssh
ssl
status
store
synology
system-compatibility-issue
test-suite
third-party-integration
triage
triage-needed
troubleshooting
UX
waiting-feedback
windows
wontfix
zitadel
No Label client feature-request
Milestone
No items
No Milestone
Projects
Clear projects
No project
Assignees
Clear assignees
saavagebueno
No Assignees
1 Participants
Notifications
Due Date
No due date set.
Dependencies

No dependencies set.

Reference: SVI/netbird#1543
Delete Branch "%!s()"

Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?