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 eth1 -s 1500 port not 22
You can skip additional ports too:
tcpdump -i eth1 -s 1500 port not 22 and port not 53
You can also use ip or hostname:
tcpdump -i eth1 port not 22 and host 220.127.116.11