tcpdump: Monitor ALL eth1 Traffic Except My Own SSH Session

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 1.2.3.4

See also:

man tcpdump

Posted by: SXI ADMIN

The author is the creator of SXI LLC and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.