[PR #4245] [client] Add support for retain existing AllowedIPs when no alternative paths are available #25001

New Issue

saavagebueno · 2026-08-05T06:09:24-04:00

saavagebueno commented

2026-08-05 06:09:24 -04:00

Original Pull Request: https://github.com/netbirdio/netbird/pull/4245

State: closed
Merged: No

We are using Netbird to manage our WireGuard network (without relay nodes). Our topology is relatively stable and does not change frequently.

We have analyzed potential network instability issues that may occur when either the ICE connection drops or the management API becomes temporarily unavailable. As noted in this comment, in such cases, network routes (e.g., 10.0.0.0/24) are removed from AllowedIPs, effectively cutting off connectivity.

In our scenario, we prefer:
• When ICE fails or the management service is temporarily down, the existing network connectivity should remain unaffected. The system should not proactively remove AllowedIPs, especially when no alternative paths are available.
• Even if the management service remains operational, the temporary unavailability of routes during ICE reconnection is still unacceptable, as it causes unnecessary and avoidable disruptions.

We propose adding an option to enable a failsafe routing mode, where:
• Route manager only updates AllowedIPs when a valid, reachable path is available.
• If no valid path is detected, the current AllowedIPs are kept unchanged.

This behavior would help prevent unnecessary network disconnections caused by transient ICE or management issues.

Example environment variable:

NB_ROUTE_STICKY_ON_FAILURE=true

Issue ticket number and link

Stack

Checklist

Is it a bug fix
Is a typo/documentation fix
Is a feature enhancement
It is a refactor
Created tests that fail without the change (if possible)
Extended the README / documentation, if necessary

By submitting this pull request, you confirm that you have read and agree to the terms of the Contributor License Agreement.

**Original Pull Request:** https://github.com/netbirdio/netbird/pull/4245 **State:** closed **Merged:** No --- We are using Netbird to manage our WireGuard network (without relay nodes). Our topology is relatively stable and does not change frequently. We have analyzed potential network instability issues that may occur when either the ICE connection drops or the management API becomes temporarily unavailable. As noted in [this comment](https://github.com/netbirdio/netbird/issues/1584#issuecomment-2179294070), in such cases, network routes (e.g., 10.0.0.0/24) are removed from AllowedIPs, effectively cutting off connectivity. In our scenario, we prefer: • When ICE fails or the management service is temporarily down, the existing network connectivity should remain unaffected. The system should not proactively remove AllowedIPs, especially when no alternative paths are available. • Even if the management service remains operational, the temporary unavailability of routes during ICE reconnection is still unacceptable, as it causes unnecessary and avoidable disruptions. We propose adding an option to enable a failsafe routing mode, where: • Route manager only updates AllowedIPs when a valid, reachable path is available. • If no valid path is detected, the current AllowedIPs are kept unchanged. This behavior would help prevent unnecessary network disconnections caused by transient ICE or management issues. Example environment variable: ``` NB_ROUTE_STICKY_ON_FAILURE=true ``` ## Issue ticket number and link ## Stack  ### Checklist - [ ] Is it a bug fix - [ ] Is a typo/documentation fix - [x] Is a feature enhancement - [ ] It is a refactor - [ ] Created tests that fail without the change (if possible) - [ ] Extended the README / documentation, if necessary > By submitting this pull request, you confirm that you have read and agree to the terms of the [Contributor License Agreement](https://github.com/netbirdio/netbird/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT.md).

saavagebueno added the pull-request label 2026-08-05 06:09:24 -04:00

saavagebueno closed this issue

2026-08-05 06:09:24 -04:00

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Reference: DYNR/netbird#25001