Preserve real client source IP in builtin port driver via IP_TRANSPARENT#565
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AkihiroSuda wants to merge 1 commit intorootless-containers:masterfrom
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Preserve real client source IP in builtin port driver via IP_TRANSPARENT#565AkihiroSuda wants to merge 1 commit intorootless-containers:masterfrom
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Use IP_TRANSPARENT socket option in the child process to bind outgoing connections to the real client IP:port, so backend services see the original source address instead of 127.0.0.1. This leverages CAP_NET_ADMIN in the user namespace and policy routing to complete TCP handshakes without iptables. Falls back gracefully to normal dial on older kernels or when routing setup fails. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
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This was referenced Apr 3, 2026
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The src IP is now preserved in the case of nerdctl, but it seems still not propagated in the case of Docker (unless
userland-proxyis set tofalse).Fix #558
NOTE: used Claude Code