28e553bc5f
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Root cause found via pcap analysis: MikroTik with connection-count=N sends UDP from N different source ports (2257, 2258, 2259, ...) all to our single server port 2001. A connect()'d UDP socket only accepts packets from the one connected address, silently dropping ~75% of traffic with conn_count=4. Fix: when tcp_conn_count > 0, leave the UDP socket unconnected and use send_to()/recv_from() instead of send()/recv(). This accepts packets from all MikroTik source ports. This bug also exists in the original C btest-opensource. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>