Monitoring Captured Packets on a Cisco Switch
Sniffing on a switch
Note that once you are monitoring these ports you can feed all the data into Ethereal the handy color coding on the packets makes troubleshooting the data stream so much easier.
the command to sniff from say 10.70.1.2 port interface fa0/15 to 10.70.1.5 port interface fa0/14? I am using a Cisco 2950 switch.

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