Gilles Dufour Tue, 10/02/2007 - 23:59
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that's not the CSS.

From my lab:


[[email protected]-1 cisco]# !tel

telnet 192.168.30.120 12176

Trying 192.168.30.120...

0.000000 192.168.30.48 -> 192.168.30.120 TCP 4306 > 12176 [SYN] Seq=0 Ack=0 Win=5840 Len=0 MSS=1460 TSV=1818741423 TSER=0 WS=0

2.995762 192.168.30.48 -> 192.168.30.120 TCP 4306 > 12176 [SYN] Seq=0 Ack=0 Win=5840 Len=0 MSS=1460 TSV=1818741723 TSER=0 WS=0

8.995756 192.168.30.48 -> 192.168.30.120 TCP 4306 > 12176 [SYN] Seq=0 Ack=0 Win=5840 Len=0 MSS=1460 TSV=1818742323 TSER=0 WS=0


[[email protected]-1 cisco]#

wilson_1234_2 Wed, 10/03/2007 - 05:36
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Thanks for the reply.


Just to learn something:


Are you verifying this by there being no "ack" in the attempt to connect on that port?

Gilles Dufour Wed, 10/03/2007 - 05:48
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indeed, the SYN stays unanswered by the CSS.

As opposed to a telnet to an open port :


[[email protected]-1 cisco]# telnet 192.168.30.120

Trying 192.168.30.120...

Connected to 192.168.30.120 (192.168.30.120).

Escape character is '^]'.

0.000000 192.168.30.48 -> 192.168.30.120 TCP 4311 > telnet [SYN] Seq=0 Ack=0 W in=5840 Len=0 MSS=1460 TSV=1820838209 TSER=0 WS=0

0.001906 192.168.30.120 -> 192.168.30.48 TCP telnet > 4311 [SYN, ACK] Seq=0 Ac k=1 Win=8192 Len=0 MSS=1460


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