Document what the client --disable-firewall flag turns off - #968
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Warning Review limit reachedNext included review available in 49 minutes. View limit detailsLimit details: You’ve used the included review currently available. You've used all free OSS reviews for now. Wait for the free limit to reset to keep reviewing this public repository. Review configuration: ⚙️ Run configurationConfiguration used: Organization UI Review profile: CHILL Plan: Advanced Run ID: 📒 Files selected for processing (1)
📝 WalkthroughWalkthroughThe change adds a client guide for ChangesDisable Firewall Documentation
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to This documentation adds important disable-firewall guidance, but the DNS fallback diagnosis can mislead affected users and the public-content guideline issue remains. Correct both before publication. Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Actionable comments posted: 2
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Inline comments:
In `@src/pages/client/disable-firewall.mdx`:
- Line 45: Replace the literal loopback IP addresses in the kernel-mode resolver
explanation with descriptive placeholders such as “<loopback address>”, while
preserving the port-binding and DNAT behavior described.
In `@src/pages/manage/dns/troubleshooting.mdx`:
- Line 627: Update the “The port 53 redirect” troubleshooting guidance to
inspect NetBird’s listener without filtering exclusively for :53, include both
UDP and TCP listeners, and compare the reported listener port against 53 to
determine whether fallback redirection is needed.
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📒 Files selected for processing (4)
src/components/NavigationDocs.jsxsrc/pages/client/disable-firewall.mdxsrc/pages/get-started/cli.mdxsrc/pages/manage/dns/troubleshooting.mdx
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Describe your changes
--disable-firewallis documented only by its own help text ("the client won't modify firewall rules"), which understates it: the firewall manager is also where NAT for routed traffic, the DNS port 53 redirect, thefirewalld/host-chain interface trust and the userspace packet filter live. This adds a page listing what the flag turns off, what still works, and narrower alternatives.netbird upflag list in the CLI reference pointing at it--disable-firewall", with how to spot the flag in a debug bundle and how to confirm the missing port 53 redirectThe two consequences worth calling out, because neither is obvious from the flag name:
--block-inboundsilently stops blocking, since it works by withholding accept rules so that the firewall's default drop applies; and a peer with the flag cannot serve routes or act as an exit node.The port 53 redirect section describes the behaviour after netbirdio/netbird#7439, which replaces the eBPF UDP forwarder with UDP and TCP DNAT rules. Before that PR the redirect exists only when the eBPF program loads, so the firewall dependency is limited to the TCP half on kernels 5.7 and newer. Worth merging after #7439 for that reason.
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