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Impossible to get P2P between two peers yet ports seems open #1952

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opened 2025-11-20 06:10:11 -05:00 by saavagebueno · 0 comments
saavagebueno commented 2025-11-20 06:10:11 -05:00
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Originally created by @Silex on GitHub (Jun 10, 2025).

Describe the problem

I have peer "arqivis" (arqivis-web, hetzner server), peer "pv" (stvs-pv-laptop1, windows machine) and peer "trb3" (pictet-trb3, openwrt 5G router).
I get P2P between arqivis & pv, and between arqivis & trb3, but no matter what I try I cannot get P2P connexion between "pv" & "trb3".

To Reproduce

  • "pv" is a windows machine on home wifi with UDP port 51820 forwarded from WAN to laptop.
  • "arqivis" is a hetzner server directly connected to internet.
  • "trb3" is a Teltonika TRB 500 5G router that runs openwrt (arm), it is in the CGNAT range and has no public IP adddress (5G).

Expected behavior

Given the 5G router is able to get P2P with hetzner, it should be able to get P2P with the windows machine that has forwarded necessary ports.

Are you using NetBird Cloud?

No, self hosted.

NetBird version

netbird server 0.46.0
pv 0.45.3
arqivis 0.37.1
trb3 0.36.5

Is any other VPN software installed?

Zerotier on the router, as a plan B for if netbird fails.

Debug output

trb3-client.log
trb3-status.log
arqivis-client.log
arqivis-status.log
pv-client.log
pv-status.log

In pv-client.log, both PIONS_LOG_DEBUG=all NB_LOG_LEVEL=debug are set.
in trb-client.log, only NB_LOG_LEVEL=debug is set.

The interesting part is this:

arqivis:

 stvs-pv-laptop1.netbird.stvs:
  NetBird IP: 100.70.63.243
  Public key: BK1kwiMi55Vai1e1WhEtdal3sT2pueG5l1E+fCgurmg=
  Status: Connected
  -- detail --
  Connection type: P2P
  ICE candidate (Local/Remote): srflx/prflx
  ICE candidate endpoints (Local/Remote): 65.21.72.59:51820/194.230.140.133:51820

As we see, arqivis successfully uses 194.230.140.133:51820 which is pv public IP to establish P2P.

But on trb3:

 stvs-pv-laptop1.netbird.stvs:
  NetBird IP: 100.70.63.243
  Public key: BK1kwiMi55Vai1e1WhEtdal3sT2pueG5l1E+fCgurmg=
  Status: Connected
  -- detail --
  Connection type: Relayed
  ICE candidate (Local/Remote): -/-
  ICE candidate endpoints (Local/Remote): -/-

Somehow it looks like it has trouble reaching 194.230.140.133:51820.

Screenshots

No screenshots.

Additional context

None.

Have you tried these troubleshooting steps?

  • Reviewed client troubleshooting (if applicable)
  • Checked for newer NetBird versions
  • Searched for similar issues on GitHub (including closed ones)
  • Restarted the NetBird client
  • Disabled other VPN software
  • Checked firewall settings

Related to #3949

Originally created by @Silex on GitHub (Jun 10, 2025). **Describe the problem** I have peer "arqivis" (arqivis-web, hetzner server), peer "pv" (stvs-pv-laptop1, windows machine) and peer "trb3" (pictet-trb3, openwrt 5G router). I get P2P between arqivis & pv, and between arqivis & trb3, but no matter what I try I cannot get P2P connexion between "pv" & "trb3". **To Reproduce** - "pv" is a windows machine on home wifi with UDP port 51820 forwarded from WAN to laptop. - "arqivis" is a hetzner server directly connected to internet. - "trb3" is a Teltonika TRB 500 5G router that runs openwrt (arm), it is in the CGNAT range and has no public IP adddress (5G). **Expected behavior** Given the 5G router is able to get P2P with hetzner, it should be able to get P2P with the windows machine that has forwarded necessary ports. **Are you using NetBird Cloud?** No, self hosted. **NetBird version** netbird server `0.46.0` pv `0.45.3` arqivis `0.37.1` trb3 `0.36.5` **Is any other VPN software installed?** Zerotier on the router, as a plan B for if netbird fails. **Debug output** [trb3-client.log](https://github.com/user-attachments/files/20675613/trb3-client.log) [trb3-status.log](https://github.com/user-attachments/files/20675615/trb3-status.log) [arqivis-client.log](https://github.com/user-attachments/files/20675614/arqivis-client.log) [arqivis-status.log](https://github.com/user-attachments/files/20675617/arqivis-status.log) [pv-client.log](https://github.com/user-attachments/files/20675616/pv-client.log) [pv-status.log](https://github.com/user-attachments/files/20675612/pv-status.log) In pv-client.log, both `PIONS_LOG_DEBUG=all NB_LOG_LEVEL=debug` are set. in trb-client.log, only `NB_LOG_LEVEL=debug` is set. The interesting part is this: arqivis: ``` stvs-pv-laptop1.netbird.stvs: NetBird IP: 100.70.63.243 Public key: BK1kwiMi55Vai1e1WhEtdal3sT2pueG5l1E+fCgurmg= Status: Connected -- detail -- Connection type: P2P ICE candidate (Local/Remote): srflx/prflx ICE candidate endpoints (Local/Remote): 65.21.72.59:51820/194.230.140.133:51820 ``` As we see, arqivis successfully uses `194.230.140.133:51820` which is pv public IP to establish P2P. But on trb3: ``` stvs-pv-laptop1.netbird.stvs: NetBird IP: 100.70.63.243 Public key: BK1kwiMi55Vai1e1WhEtdal3sT2pueG5l1E+fCgurmg= Status: Connected -- detail -- Connection type: Relayed ICE candidate (Local/Remote): -/- ICE candidate endpoints (Local/Remote): -/- ``` Somehow it looks like it has trouble reaching `194.230.140.133:51820`. **Screenshots** No screenshots. **Additional context** None. **Have you tried these troubleshooting steps?** - [x] Reviewed [client troubleshooting](https://docs.netbird.io/how-to/troubleshooting-client) (if applicable) - [x] Checked for newer NetBird versions - [x] Searched for similar issues on GitHub (including closed ones) - [x] Restarted the NetBird client - [x] Disabled other VPN software - [x] Checked firewall settings Related to #3949
saavagebueno added the triage-needed label 2025-11-20 06:10:11 -05:00
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Reference: SVI/netbird#1952
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