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Bind all TCP sockets (listeners and outbound connections) to a specified VRF device via SO_BINDTODEVICE when --vrf is set. Unix sockets (BIRD) are unaffected. Linux-only; panics at startup on other platforms if configured. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Full disclosure, this has been vibe-coded with Claude.
I was trying to run bird-lg-proxy in a VRF bound to a single IP and found out that didn't quite work (if the IP isn't present in the default VRF, it will fail to start). Then, I realized that I can't always rely on
ip vrf execbecause it might not work in containers (BPF stuff I'm not qualified to speculate about). So I asked Claude to create the minimum amount of changes to support binding to a VRF usingSO_BINDTODEVICE. I've built this on NixOS and it works in the setup I was intending it to use it in (bound to a VRF IP). I'll understand if merging AI generated changes is not acceptable, just trying to see if there's interest in these changes.