[PR #487] [MERGED] External NAT IP mapping support #12673

New Issue

saavagebueno · 2026-08-05T02:06:25-04:00

saavagebueno commented

2026-08-05 02:06:25 -04:00

📋 Pull Request Information

Original PR: https://github.com/netbirdio/netbird/pull/487
Author: @tkunicki
Created: 9/30/2022
Status: ✅ Merged
Merged: 11/23/2022
Merged by: @mlsmaycon

Base: main ← Head: nat_external_ip

📝 Commits (5)

db8882b External NAT IP mapping support
bc69a0a Remove STUN derived external IP determination, per review comments
fd1bd7a No need to recheck external IP mapping every peer connection attempt after STUN option removed
2313ae8 Ignore blacklisted interfaces, even if in user specified in mapping
eed95df don't return any NATExternalIP mappings if one or more fail to parse

📊 Changes

5 files changed (+120 additions, -17 deletions)

View changed files

📝 .gitignore (+2 -1)
📝 client/internal/config.go (+21 -3)
📝 client/internal/connect.go (+4 -2)
📝 client/internal/engine.go (+84 -6)
📝 client/internal/peer/conn.go (+9 -5)

📄 Description

Support external IP mappings for host interface IPs

The external IP must not be behind a CGNAT and port-forwarding for incoming UDP packets from WgPort on from the external IP to WgPort on the host interface IP must be present. This can take form of:

single port-forwarding rule from external IP to host interface IP
1:1 DNAT mapping ExternalIP to host interface IP
NAT DMZ to host interface IP.

Configuration

A special value of stun will use the STUN server's XORMappedAddress to set the External IP value; this is for installations behind dynamic DHCP assuming the above restrictions are met.

A single mapping will take the form of external[/internal]

external (required):
- external IP address or stun to use STUN to determine the external IP address
internal (optional)
- the host interface IP address or an interface name
- if the "internal" argument is present and "stun" is specified for external, the STUN request will be generated by a connection originating from the specified host interface IP

Examples:

 "stun"                 => all interface IPs will be mapped to external IP reported by stun
 "12.34.56.78"          => all interfaces IPs will be mapped to external IP of 12.34.56.78
 "stun/eth0"            => IPv4 assigned to interface eth0 will be mapped to external IP reported by stun
 "stun/10.1.2.3"        => interface IP 10.1.2.3 will be mapped to external IP reported by stun
 "12.34.56.78/eth0"     => IPv4 assigned to interface eth0 will be mapped to external IP of 12.34.56.78
 "12.34.56.78/10.1.2.3" => interface IP 10.1.2.3 will be mapped to external IP of 12.34.56.78

_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

## 📋 Pull Request Information **Original PR:** https://github.com/netbirdio/netbird/pull/487 **Author:** [@tkunicki](https://github.com/tkunicki) **Created:** 9/30/2022 **Status:** ✅ Merged **Merged:** 11/23/2022 **Merged by:** [@mlsmaycon](https://github.com/mlsmaycon) **Base:** `main` ← **Head:** `nat_external_ip` --- ### 📝 Commits (5) - [`db8882b`](https://github.com/netbirdio/netbird/commit/db8882b01a2bdc3db7a09cc1fc77966d3c80b74d) External NAT IP mapping support - [`bc69a0a`](https://github.com/netbirdio/netbird/commit/bc69a0ad6c8abd1d21026161b50d12b2894af9c0) Remove STUN derived external IP determination, per review comments - [`fd1bd7a`](https://github.com/netbirdio/netbird/commit/fd1bd7a6cd838be61e196f26bb51c801ae6e6dd8) No need to recheck external IP mapping every peer connection attempt after STUN option removed - [`2313ae8`](https://github.com/netbirdio/netbird/commit/2313ae837839a3ab300111ba69315de738b65f33) Ignore blacklisted interfaces, even if in user specified in mapping - [`eed95df`](https://github.com/netbirdio/netbird/commit/eed95df43ffdddfe1c452cbe94e98dee9b1aa8f2) don't return any NATExternalIP mappings if one or more fail to parse ### 📊 Changes **5 files changed** (+120 additions, -17 deletions) <details> <summary>View changed files</summary> 📝 `.gitignore` (+2 -1) 📝 `client/internal/config.go` (+21 -3) 📝 `client/internal/connect.go` (+4 -2) 📝 `client/internal/engine.go` (+84 -6) 📝 `client/internal/peer/conn.go` (+9 -5) </details> ### 📄 Description ### Support external IP mappings for host interface IPs The external IP **_must not be behind_** a CGNAT **_and_** port-forwarding for incoming UDP packets from `WgPort` on from the external IP to `WgPort` on the host interface IP **_must be present_**. This can take form of: - single port-forwarding rule from external IP to host interface IP - 1:1 DNAT mapping ExternalIP to host interface IP - NAT DMZ to host interface IP. #### Configuration A special value of `stun` will use the STUN server's XORMappedAddress to set the External IP value; this is for installations behind dynamic DHCP assuming the above restrictions are met. A single mapping will take the form of `external[/internal]` - `external` (required): - external IP address or `stun` to use STUN to determine the external IP address - `internal` (optional) - the host interface IP address or an interface name - if the "internal" argument is present and "stun" is specified for `external`, the STUN request will be generated by a connection originating from the specified host interface IP #### Examples: ``` "stun" => all interface IPs will be mapped to external IP reported by stun "12.34.56.78" => all interfaces IPs will be mapped to external IP of 12.34.56.78 "stun/eth0" => IPv4 assigned to interface eth0 will be mapped to external IP reported by stun "stun/10.1.2.3" => interface IP 10.1.2.3 will be mapped to external IP reported by stun "12.34.56.78/eth0" => IPv4 assigned to interface eth0 will be mapped to external IP of 12.34.56.78 "12.34.56.78/10.1.2.3" => interface IP 10.1.2.3 will be mapped to external IP of 12.34.56.78 ``` --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>

saavagebueno added the pull-request label 2026-08-05 02:06:25 -04:00

saavagebueno closed this issue

2026-08-05 02:06:26 -04:00

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Reference: DYNR/netbird#12673