[GH-ISSUE #3740] Slow speed if relayed #7779

New Issue

saavagebueno · 2026-08-05T01:14:32-04:00

saavagebueno commented

2026-08-05 01:14:32 -04:00

Originally created by @netandreus on GitHub (Apr 25, 2025).
Original GitHub issue: https://github.com/netbirdio/netbird/issues/3740

Describe the problem

I have two peers in different countries. All peers behind NAT (Mikrotik) and has 100 Mbps internet channel.
When I test network between Mikrotiks I have a good speed.

58 / 94 Mbps

and

76 / 85 Mbps

But when I try to test with iperf from one netbird peer to another I have very small speed.

3 / 13 Mbps

Both peers are Relayed for each other.

What should I do to increase speed?

Are you using NetBird Cloud?

No, self-hosted.

NetBird version

0.38.2

Is any other VPN software installed?

No

Have you tried these troubleshooting steps?

[-] 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 issues

P2P Connection Across Subnets / VLANs?

Originally created by @netandreus on GitHub (Apr 25, 2025). Original GitHub issue: https://github.com/netbirdio/netbird/issues/3740 **Describe the problem** I have two peers in different countries. All peers behind NAT (Mikrotik) and has 100 Mbps internet channel. When I test network between Mikrotiks I have a good speed. ![Image](https://github.com/user-attachments/assets/665a1742-8585-478f-b0be-d537281cee4c) 58 / 94 Mbps and ![Image](https://github.com/user-attachments/assets/02a6c523-7eb7-4090-920d-ed89704194bd) 76 / 85 Mbps But when I try to test with iperf from one netbird peer to another I have very small speed. ![Image](https://github.com/user-attachments/assets/5047da8b-9bed-4eba-a0a8-699b7d9ceab0) 3 / 13 Mbps Both peers are ```Relayed``` for each other. <img width="1627" alt="Image" src="https://github.com/user-attachments/assets/cfebb576-3f6a-4393-bd63-8c67b1cbdfc1" /> What should I do to increase speed? **Are you using NetBird Cloud?** No, self-hosted. **NetBird version** 0.38.2 **Is any other VPN software installed?** No **Have you tried these troubleshooting steps?** - [-] 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 issues** - [P2P Connection Across Subnets / VLANs?](https://github.com/netbirdio/netbird/issues/3648)

saavagebueno added the triage-needed label 2026-08-05 01:14:32 -04:00

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Reference: DYNR/netbird#7779