FIN_WAIT_[1,2] and LAST_ACK

[Andre Oppermann]

Julian Elischer wrote:
> On the topic of Session shutdown...
> 
>  I have noticed an increasing number of machines on the net
> are terminating their session (usually the server, but not always)
> with a  RESET packet instead of a FIN packet.
> In particular it seems that if the machine in question recieves
> a FIN packet, and has no more data to send, it replies with
> a RESET.
> 
> I don't know what kind of machines this is but next time I see it I
> guess I'll look at it harder.

I'd guess that are stateful firewalls in the path doing that.  But
finding it out with proof is better.

-- 
Andre