Wednesday, September 14, 2011

Monitor ALL eth0 Traffic Except My Own SSH Session tcpdump:

I'm using tcpdump to dump, debug and monitor traffic on a network. However, there is lots of noise and I would like to exclude ssh from my dumps. How do I monitor all traffic except my ssh session?

The tcpdump command displays out the headers of packets on a network interface that match the boolean expression. In other words you can use boolean expression to drop ssh traffic from dumping and monitoring operation using the following syntax:
tcpdump -i eth0  -s 1500 port not 22
You can skip additional ports too:
tcpdump -i eth0  -s 1500 port not 22 and port not 53
You can also use ip or hostname:
tcpdump -i eth0 port not 22 and host 1.2.3.4

See also:

man tcpdump
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