> On Mac OSX 10.11.5 (latest version), we have found that when tcp > connections are abruptly terminated (via ^C), a FIN is sent followed > by an RST packet. The RST is sent with the same sequence number as the > FIN, and thus dropped since the stack only accepts RST packets matching > rcv_nxt (RFC 5961).
The Linux behaviour appears to be correct, and accepting a broken FIN is most definitely a bad idea, it has a very different effect to a FIN because there can be data going the other direction and a FIN is a one way close Alan
