Re: TCP socket close problem

Right. So indeed it looks like the server doesn't really see the
incoming FIN/RST at all.

I added the TCPDEBUG option to the server's kernel; this is the trpt
output on the socket in question:

369 ESTABLISHED:drop (src=212.209.153.82,55478, dst=212.247.27.201,5000)3746edf6@8ed0b5b(win=ffff)<ACK> -> ESTABLISHED
rcv_nxt 3746edf6 rcv_wnd 100a4 snd_una 8ed0b5b snd_nxt 8ed27df snd_max 8ed27df
snd_wl1 3746edf6 snd_wl2 8ed0b5b snd_wnd ffff
370 ESTABLISHED:output (src=212.247.27.201,5000, dst=212.209.153.82,55478)[8ed16c3..8ed16af)@3746edf6(win=ffff)<ACK> -> ESTABLISHED
rcv_nxt 3746edf6 rcv_wnd 100a4 snd_una 8ed0b5b snd_nxt 8ed27df snd_max 8ed27df
snd_wl1 3746edf6 snd_wl2 8ed0b5b snd_wnd ffff
370 ESTABLISHED:drop (src=212.209.153.82,55478, dst=212.247.27.201,5000)3746edf6@8ed0b5b(win=ffff)<ACK,FIN> -> ESTABLISHED
rcv_nxt 3746edf6 rcv_wnd 100a4 snd_una 8ed0b5b snd_nxt 8ed27df snd_max 8ed27df
snd_wl1 3746edf6 snd_wl2 8ed0b5b snd_wnd ffff
370 ESTABLISHED:drop (src=212.209.153.82,55478, dst=212.247.27.201,5000)3746edf7@8ed110f<ACK,RST> -> ESTABLISHED
rcv_nxt 3746edf6 rcv_wnd 100a4 snd_una 8ed0b5b snd_nxt 8ed27df snd_max 8ed27df
snd_wl1 3746edf6 snd_wl2 8ed0b5b snd_wnd ffff
413 ESTABLISHED:output (src=212.247.27.201,5000, dst=212.209.153.82,55478)[8ed0b5b..8ed0b47)@3746edf6(win=ffff)<ACK> -> ESTABLISHED
rcv_nxt 3746edf6 rcv_wnd 100a4 snd_una 8ed0b5b snd_nxt 8ed110f snd_max 8ed27df
snd_wl1 3746edf6 snd_wl2 8ed0b5b snd_wnd ffff

So, indeed, the packets with the FIN and RST (and also, a preceeding
ACK) are dropped by tcp_input. Need to figure out why...

Staffan
.

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