Linux network status cheat sheet

I’ll keep adding some good reference material here for checking Linux connections from the command line:

TCPDUMP

yum install tcpdump

See all port 25 connections

tcpdump -n dst port 25
tcpdump -n dst host * port 25
tcpdump -n dst host any port 25
tcpdump -i eth1 tcp port 25

Apachetop

Go to the link above if you’re looking for a way to view Apache logs in real-time.

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