[GH-ISSUE #4247] v0.52.1 breaks local resolver #8781

New Issue

saavagebueno · 2026-08-05T01:19:31-04:00

saavagebueno commented

2026-08-05 01:19:31 -04:00

Originally created by @LordAnchemis on GitHub (Jul 30, 2025).
Original GitHub issue: https://github.com/netbirdio/netbird/issues/4247

Situation

Local DNS reoslution fails if no nameserver defined in dashboard after v0.52.1 update

Background

System details:

Proxmox VE 8.4.5
Debian 12 LXC template
main services running: nginx

Issue first noticed on trying to update (debian) package lists using apt after updating from 0.52.0 to 0.52.1
-> unable to resolve debian.org etc.

Issue is 'fixed' when netbird disabled (with netbird down)

Assessment

This is due to DNS nameserver resolution
-> /etc/resolv.conf gets overwritten (with a cloud nameserver) when netbird is up
-> pinging debian.org fails (temporary failure in name resolution)
-> pinging the IPv6 address of debian.org works (2a04:4e42:200::644)

So it seems that when there is no DNS nameserver configured in dashboard, local DNS resolution (for IPv4) fails

Temp solution: adding custom DNS nameserver on dashboard

Recommendation

Please fix local DNS resolution, thanks

Originally created by @LordAnchemis on GitHub (Jul 30, 2025). Original GitHub issue: https://github.com/netbirdio/netbird/issues/4247 ### Situation Local DNS reoslution fails if no nameserver defined in dashboard after v0.52.1 update ### Background System details: - Proxmox VE 8.4.5 - Debian 12 LXC template - main services running: nginx Issue first noticed on trying to update (debian) package lists using apt after updating from 0.52.0 to 0.52.1 -> unable to resolve debian.org etc. Issue is 'fixed' when netbird disabled (with netbird down) ### Assessment This is due to DNS nameserver resolution -> /etc/resolv.conf gets overwritten (with a cloud nameserver) when netbird is up -> pinging debian.org fails (temporary failure in name resolution) -> pinging the IPv6 address of debian.org works (2a04:4e42:200::644) So it seems that when there is no DNS nameserver configured in dashboard, local DNS resolution (for IPv4) fails **Temp solution:** adding custom DNS nameserver on dashboard ### Recommendation Please fix local DNS resolution, thanks

saavagebueno added the bug client triage-needed labels 2026-08-05 01:19:31 -04:00

saavagebueno commented

2026-08-05 01:19:32 -04:00

@buzzzo commented on GitHub (Jul 30, 2025):

I've created a separate issue regarding this, mostly because this feature breaks things and it is not requested on every scenarios.

@buzzzo commented on GitHub (Jul 30, 2025): I've created a separate issue regarding this, mostly because this feature breaks things and it is not requested on every scenarios.

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dependabot/github_actions/actions-a940c7c866

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dependabot/go_modules/pion-5f703e1eca

dependabot/go_modules/gorm-2271c8195b

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dependabot/go_modules/google.golang.org/grpc-1.82.1

fix/ui-gtk3-support

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dependabot/go_modules/goauthentik.io/api/v3-3.2026050.6

dependabot/go_modules/github.com/pires/go-proxyproto-0.15.0

dependabot/go_modules/github.com/jackc/pgx/v5-5.10.0

dependabot/go_modules/github.com/oapi-codegen/runtime-1.6.0

dependabot/go_modules/github.com/eko/gocache/lib/v4-4.2.4

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Reference: DYNR/netbird#8781