Re: strange Mac OSX RST behavior

[One Thousand Gnomes]

> 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