RST packets

Jörg Harmuth harmuth at
Thu Jul 21 12:56:40 CEST 2005

Jan Engelhardt schrieb:

> What would be the use of RST if it is not part of a connection?
> Is it...vv?
>   A and B are connected
>   A crashes
>   B tries to send
>   A sends RST,!ACK

Yes, half-open connections. The other purpose is to recover from
duplicate SYNs, where SYN2 arrives before SYN1, which could confuse
TCPs. See figure 9 in RFC793, p. 32ff for a discussion of RST generation
and processing.

Have a nice time,


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