ipt_unclean: TCP flags bad: 4
I only see them when my ppp link is up - pppd version 2.4.0
Looking at ipt_unclean.c it seems that this message will be generated
when I send a packet with flags set to RST only.
I've run a ppp session with the pppd option "record" turned on, and
analysed the output with "ethereal". This is indeed what is on the
wire. I'm no expert on TCP I'm afraid. The complete TCP stream
follows:
------------------------------------------------------------------------------
No. Time Source Destination Protocol Info
129 12.800000 62.137.113.223 news.svr.pol.co.uk TCP
1148 > nntp [SYN] Seq=3684831495 Ack=0 Win=5840 Len=0
131 12.900000 news.svr.pol.co.uk 62.137.113.223 TCP
nntp > 1148 [SYN, ACK] Seq=2607886663 Ack=3684831496 Win=32736 Len=0
137 13.300000 62.137.113.223 news.svr.pol.co.uk TCP
1148 > nntp [FIN, ACK] Seq=3684831502 Ack=2607887466 Win=7090 Len=0
142 13.400000 62.137.113.223 news.svr.pol.co.uk TCP
1148 > nntp [RST] Seq=3684831503 Ack=0 Win=0 Len=0
------------------------------------------------------------------------------
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