Marcel Gagné has retired "Tux Knows It's Nice to Share"
and he's moved on to "Your Network's Secret Life," which offers an
overview of network management and visualization tools.
"Over the course of this series, I want to be able to
give you some insight into your network. What's happening out there
over your twisted pair cabling that you don't know about? We'll
look at the tools you already have and then some nice, graphical
tools that not only let you monitor your network but visualize it.
Looking to impress the boss with what Linux can do? The old Corner
may have the ticket.
While it may seem incredibly obvious, the best way to understand
what is happening on your network is to know your network. If there
is a host out there doing anything, you need to be able to identify
it (or at least account for it).
One of the single most effective (and overlooked) network
discovery tools is netstat. It comes bundled with every Linux
distribution, and it can tell you a great deal about what is
happening on your server. For instance, by using the program with
the -a and -p flags, you can find every connection (or port) open
on your system and what programs are using those ports."
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