[PR #4833] [client] Use Go's resolver for darwin for control plane and ICE traffic #21376

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saavagebueno · 2026-08-05T05:08:26-04:00

saavagebueno commented

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

Original Pull Request: https://github.com/netbirdio/netbird/pull/4833

State: closed
Merged: No

Describe your changes

Under certain conditions (sleep/wake), macOS can get stuck on getaddrinfo syscalls, rendering the system DNs broken.

To avoid this, we use Go's resolver. Go's resolver has the drawback that it doesn't take split DNS or any other scutil --dns settings into account. So we can only use that when it is safe to use /etc/resolv.conf directly, e.g., control plane traffic (our custom nbnet.Dialer plus stdnet's resolve methods internally used by ICE).

This behavior can be overridden by using the NB_DNS_RESOLVER environment variable.

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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)

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Summary by CodeRabbit

New Features
- DNS resolver selection can now be controlled via the NB_DNS_RESOLVER environment variable, supporting "system" and "go" options.
- macOS now defaults to an optimized DNS resolution mode for more reliable name lookups.
- Non-root Linux and general client networking now use the configured resolver for more consistent DNS behavior.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

**Original Pull Request:** https://github.com/netbirdio/netbird/pull/4833 **State:** closed **Merged:** No --- ## Describe your changes Under certain conditions (sleep/wake), macOS can get stuck on `getaddrinfo` syscalls, rendering the system DNs broken. To avoid this, we use Go's resolver. Go's resolver has the drawback that it doesn't take split DNS or any other `scutil --dns` settings into account. So we can only use that when it is safe to use `/etc/resolv.conf` directly, e.g., control plane traffic (our custom nbnet.Dialer plus stdnet's resolve methods internally used by ICE). This behavior can be overridden by using the NB_DNS_RESOLVER environment variable. ## Issue ticket number and link ## Stack  ### Checklist - [x] 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) > 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). ## Documentation Select exactly one: - [ ] I added/updated documentation for this change - [x] Documentation is **not needed** for this change (explain why) ### Docs PR URL (required if "docs added" is checked) Paste the PR link from https://github.com/netbirdio/docs here: https://github.com/netbirdio/docs/pull/__  ## Summary by CodeRabbit * **New Features** * DNS resolver selection can now be controlled via the NB_DNS_RESOLVER environment variable, supporting "system" and "go" options. * macOS now defaults to an optimized DNS resolution mode for more reliable name lookups. * Non-root Linux and general client networking now use the configured resolver for more consistent DNS behavior. <sub>✏️ Tip: You can customize this high-level summary in your review settings.</sub>

saavagebueno added the pull-request label 2026-08-05 05:08:26 -04:00

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Reference: DYNR/netbird#21376