[PR #1489] [MERGED] Validate upstream reachability on first DNS configuration #13798

New Issue

saavagebueno · 2026-08-05T02:09:02-04:00

saavagebueno commented

2026-08-05 02:09:02 -04:00

📋 Pull Request Information

Original PR: https://github.com/netbirdio/netbird/pull/1489
Author: @lixmal
Created: 1/22/2024
Status: ✅ Merged
Merged: 1/23/2024
Merged by: @lixmal

Base: main ← Head: validate-upstream-dns

📝 Commits (2)

bd8c8f3 Test upstream DNS for availability as soon as they are received from management
f1c6fdc Use root zone for DNS tests

📊 Changes

8 files changed (+119 additions, -23 deletions)

View changed files

📝 client/internal/dns/local.go (+2 -0)
📝 client/internal/dns/mock_server.go (+4 -0)
📝 client/internal/dns/server.go (+13 -2)
📝 client/internal/dns/upstream.go (+77 -15)
📝 client/internal/dns/upstream_ios.go (+5 -1)
📝 client/internal/dns/upstream_nonios.go (+8 -4)
📝 client/internal/dns/upstream_test.go (+6 -1)
📝 client/internal/engine.go (+4 -0)

📄 Description

Describe your changes

This adds an availability check for each DNS server group right after receiving DNS updates from management.
If no servers of a group are available the group will be disabled.

Issue ticket number and link

When we receive an upstream DNS server, we add the address in the system without checking if the address is reachable; this may cause issues as some queries will fail and may delay peer connection if the domains served by the upstream might contain our management layer.

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

_{🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.}

## 📋 Pull Request Information **Original PR:** https://github.com/netbirdio/netbird/pull/1489 **Author:** [@lixmal](https://github.com/lixmal) **Created:** 1/22/2024 **Status:** ✅ Merged **Merged:** 1/23/2024 **Merged by:** [@lixmal](https://github.com/lixmal) **Base:** `main` ← **Head:** `validate-upstream-dns` --- ### 📝 Commits (2) - [`bd8c8f3`](https://github.com/netbirdio/netbird/commit/bd8c8f37e706826b8fcfc5ec7dadf298e42e42c0) Test upstream DNS for availability as soon as they are received from management - [`f1c6fdc`](https://github.com/netbirdio/netbird/commit/f1c6fdc82ccb945c87ff039b4639c0997aa998b7) Use root zone for DNS tests ### 📊 Changes **8 files changed** (+119 additions, -23 deletions) <details> <summary>View changed files</summary> 📝 `client/internal/dns/local.go` (+2 -0) 📝 `client/internal/dns/mock_server.go` (+4 -0) 📝 `client/internal/dns/server.go` (+13 -2) 📝 `client/internal/dns/upstream.go` (+77 -15) 📝 `client/internal/dns/upstream_ios.go` (+5 -1) 📝 `client/internal/dns/upstream_nonios.go` (+8 -4) 📝 `client/internal/dns/upstream_test.go` (+6 -1) 📝 `client/internal/engine.go` (+4 -0) </details> ### 📄 Description ## Describe your changes This adds an availability check for each DNS server group right after receiving DNS updates from management. If no servers of a group are available the group will be disabled. ## Issue ticket number and link When we receive an upstream DNS server, we add the address in the system without checking if the address is reachable; this may cause issues as some queries will fail and may delay peer connection if the domains served by the upstream might contain our management layer. ### 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) - [ ] Extended the README / documentation, if necessary --- <sub>🔄 This issue represents a GitHub Pull Request. It cannot be merged through Gitea due to API limitations.</sub>

saavagebueno added the pull-request label 2026-08-05 02:09:02 -04:00

saavagebueno closed this issue

2026-08-05 02:09:02 -04:00

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Reference: DYNR/netbird#13798