[PR #5841] fix: set suppress_prefixlength to 8 for rule 105 #26927

New Issue

saavagebueno · 2026-08-05T07:07:59-04:00

saavagebueno commented

2026-08-05 07:07:59 -04:00

📋 Pull Request Information

Original PR: https://github.com/netbirdio/netbird/pull/5841
Author: @LokoMoloko98
Created: 4/9/2026
Status: 🔄 Open

Base: main ← Head: kartoza/fix-suppress-prefixlen

📝 Commits (1)

2ce56be fix: set suppress_prefixlength to 8 for rule 105

📊 Changes

1 file changed (+2 additions, -2 deletions)

View changed files

📝 client/internal/routemanager/systemops/systemops_linux.go (+2 -2)

📄 Description

DigitalOcean injects catch-all RFC 1918 routes (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) via vpc-peering.service at boot. With suppress_prefixlength 0, these broad routes win over NetBird's specific /24 routes in the netbird table, breaking cross-cloud routing.

Setting suppress_prefixlength to 8 causes the kernel to suppress any route with a prefix <= 8 bits when checking the main table (rule 105), allowing NetBird's more-specific /24 routes in the netbird table (rule 110) to take effect.

Affects: DO VPC environments (and any cloud that injects broad RFC 1918 catch-all routes).

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Created tests that fail without the change (if possible)

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Summary by CodeRabbit

Bug Fixes
- Updated network rule configurations to improve IP routing consistency on Linux systems.

_{🔄 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/5841 **Author:** [@LokoMoloko98](https://github.com/LokoMoloko98) **Created:** 4/9/2026 **Status:** 🔄 Open **Base:** `main` ← **Head:** `kartoza/fix-suppress-prefixlen` --- ### 📝 Commits (1) - [`2ce56be`](https://github.com/netbirdio/netbird/commit/2ce56be494ede32be46690ce8849a8c2aab484da) fix: set suppress_prefixlength to 8 for rule 105 ### 📊 Changes **1 file changed** (+2 additions, -2 deletions) <details> <summary>View changed files</summary> 📝 `client/internal/routemanager/systemops/systemops_linux.go` (+2 -2) </details> ### 📄 Description DigitalOcean injects catch-all RFC 1918 routes (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) via vpc-peering.service at boot. With suppress_prefixlength 0, these broad routes win over NetBird's specific /24 routes in the netbird table, breaking cross-cloud routing. Setting suppress_prefixlength to 8 causes the kernel to suppress any route with a prefix <= 8 bits when checking the main table (rule 105), allowing NetBird's more-specific /24 routes in the netbird table (rule 110) to take effect. Affects: DO VPC environments (and any cloud that injects broad RFC 1918 catch-all routes). ## Describe your changes ## 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 - [ ] 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 * **Bug Fixes** * Updated network rule configurations to improve IP routing consistency on Linux systems.  --- <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 07:07:59 -04:00

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Reference: DYNR/netbird#26927