GNU/Linux Desktop Survival Guide
by Graham Williams
Useful tools include ethereal which is a graphical
interface to the same output you might get from tcpdump. A
typical usage of tcpdump is:
# tcpdump -l -i eth0
The pktstat package provides terminal top-like view of network connections. This is useful to provide an instantaneous summary of network conenctions. The -F option will expand hostnames, rather than listing just the first part of a hostname (without the domain name).