[lwip-users] Re: [lwip] Tcp - Retransmission of Fin

[Adam Dunkels]

Hi!

On Thursday 07 February 2002 06.55, you wrote:
> When there is a retransmission the pcb->snd_nxt is updated from the the
> tcphdr->seqno (tcp_slowtmr function). It seems to me that in a
> retransmission of FIN , pcb->snd_nxt should be updated to tcphdr->seqno++.

snd_nxt keeps track of the next sequence number that should be sent. Since 
the FIN is the last segment that is ever sent on a connection, snd_nxt isn't 
used once the FIN has been acked. When the FIN is retransmitted, snd_nxt is 
set to the sequence number of the FIN (since that now is the next segment to 
be transmitted).

/adam
-- 
Adam Dunkels <address@hidden>
http://www.sics.se/~adam
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