Date: 2008apr15 Update: 2025sep2 OS: Linux Q. Linux: What's an alternate way to see network activity? A. Use lsof - which stands for List Open Files. Sounds weird, huh? But on Linux/Unix everything is a file -- even network connections! Here are some exampel uses (run as root): All TCP/IP connections:

lsof | grep -w TCP

All IPv6 connections:

lsof | grep -w IPv6

Or

lsof -i6

If you don't want any IPv6 running see my tip on disabling it: http://www.davekb.com/search.php?target=disable+IPv6 What's Apache doing:

lsof | grep -w httpd

(Lists files it has open and network connections - nice) lsof has many options. But I prefer simply grep-ing. If you aren't root some files will be unavailable.