Some links of mine:

snort http://www.snort.org  they also have a port search which will tell you what port
is known to have exploits.
ipchains how-to  http://linuxdocs.org/HOWTOs/IPCHAINS-HOWTO.html  this sometimes gets a
little heady for me, but check it out.
The Abacus Project (ippl, logcheck, and portsentry) http://www.psionic.com/abacus/


--
Organizing Linux users is like herding cats,
only harder.


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