[GH-ISSUE #3629] [Need help] communication with a group of nodes via a private network #7276

New Issue

saavagebueno · 2026-08-05T01:12:18-04:00

saavagebueno commented

2026-08-05 01:12:18 -04:00

Originally created by @galiev on GitHub (Apr 7, 2025).
Original GitHub issue: https://github.com/netbirdio/netbird/issues/3629

We have a self-hosted Netbird installation with nodes deployed in two regions (A and B). Clients within each region connect to the nodes in their respective region. Each region provides access to a unique set of networks. When a client from region A needs to access resources provided by nodes in region B, the nodes in region A currently forward traffic to the nodes in region B via Netbird connections over the public internet.

Our provider also offers a private, high-speed (10 Gbps), unmetered network between data centers hosting the nodes in region A and region B, the internet connection for each node is 1 Gbps, and even though the IP addresses belong to the same provider, the internet traffic between the regions is still metered and incurs costs.

We are looking for a way to force Netbird to use the private network for communication between the nodes in region A and region B, instead of routing traffic over the public internet, while still being accessible to clients on the Internet

Is there a mechanism or configuration option within Netbird that allows us to prioritize or enforce the use of this private network for inter-region node communication?

Originally created by @galiev on GitHub (Apr 7, 2025). Original GitHub issue: https://github.com/netbirdio/netbird/issues/3629 We have a self-hosted Netbird installation with nodes deployed in two regions (A and B). Clients within each region connect to the nodes in their respective region. Each region provides access to a unique set of networks. When a client from region A needs to access resources provided by nodes in region B, the nodes in region A currently forward traffic to the nodes in region B via Netbird connections over the public internet. Our provider also offers a private, high-speed (10 Gbps), unmetered network between data centers hosting the nodes in region A and region B, the internet connection for each node is 1 Gbps, and even though the IP addresses belong to the same provider, the internet traffic between the regions is still metered and incurs costs. We are looking for a way to force Netbird to use the private network for communication between the nodes in region A and region B, instead of routing traffic over the public internet, while still being accessible to clients on the Internet Is there a mechanism or configuration option within Netbird that allows us to prioritize or enforce the use of this private network for inter-region node communication?

saavagebueno closed this issue

2026-08-05 01:12:18 -04:00

saavagebueno commented

2026-08-05 01:12:18 -04:00

@galiev commented on GitHub (Apr 7, 2025):

It seems I've found the answer: If I simply block traffic via the public network using the firewall, Netbird should then switch to the private network on its own:

Netbird uses the ICE to find the best path for connections. This involves:

Gathering Candidates: Each Netbird agent identifies all its local IP addresses and potential public IP addresses (discovered via STUN servers). These become potential "candidates" for connection endpoints.
Signaling: Agents exchange these candidates lists via the Signal service.
Connectivity Checks: Agents try to establish direct UDP connections between pairs of candidate addresses (local-to-remote). This includes trying public IP to public IP, private IP to private IP, public IP to private IP, etc.
Path Selection: ICE prioritizes paths that work. Generally, direct connections are preferred over relayed (TURN) connections. Among direct paths, lower latency paths are often favored.

@galiev commented on GitHub (Apr 7, 2025): It seems I've found the answer: If I simply block traffic via the public network using the firewall, Netbird should then switch to the private network on its own: Netbird uses the ICE to find the best path for connections. This involves: - **Gathering Candidates**: Each Netbird agent identifies all its local IP addresses and potential public IP addresses (discovered via STUN servers). These become potential "candidates" for connection endpoints. - **Signaling**: Agents exchange these candidates lists via the Signal service. - **Connectivity Checks**: Agents try to establish direct UDP connections between pairs of candidate addresses (local-to-remote). This includes trying public IP to public IP, private IP to private IP, public IP to private IP, etc. - **Path Selection**: ICE prioritizes paths that work. Generally, direct connections are preferred over relayed (TURN) connections. Among direct paths, lower latency paths are often favored.

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Reference: DYNR/netbird#7276