https://blog.imcaoxuan.cn/en/tags/tcpdump/Recent content in Tcpdump on CX's BlogHugoen-USimcaoxuan.cnFri, 23 Oct 2026 16:30:00 +0800https://blog.imcaoxuan.cn/en/posts/2026-10-23-troubleshooting-dns-timeouts-on-a-bypass-router-sing-box-upstream-queries-leave-through-the-wrong-network-interface/Fri, 23 Oct 2026 16:30:00 +0800https://blog.imcaoxuan.cn/en/posts/2026-10-23-troubleshooting-dns-timeouts-on-a-bypass-router-sing-box-upstream-queries-leave-through-the-wrong-network-interface/Downstream DNS requests reach sing-box, but upstream forwarding bypasses WireGuard; locate the fault with targeted packet captures and fix it with bind_interface.