IPS 4255 - Network Sniffer?

Unanswered Question
Feb 12th, 2007

one of my network engineers has asked if I can use our IPS device as a sniffer to identify specific host to host traffic via a specific port. I am somewhat new to IPS and am looking for some direction



I have this problem too.
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mhellman Fri, 02/16/2007 - 13:21

Yes, but there are some limitations. Probably the best way to do this is via the CLI. Login with a normal account on the sensor (not a service account). Use the packet capture command:

sensor# packet capture gigabitEthernet0/0 expression

where is a tcpdump expression. So:

sensor# packet capture gigabitEthernet0/0 expression host and port 80

To get the capture off the sensor, use the "copy packet-file" command. The biggest limitation is the size. I think it's something like 15MB, which isn't always big enough.


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