Talk:Unix security
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Packet filtering
This article does not mention packet filtering and iptables.
grsecurity
This article does not mention grsecurity.
IDS
This article does not mention Intrustion Detection Systems and Snort.
Malware and Virus
Maybe ClamAV should be mentioned?
Log file monitoring
I think I'd go insane without LogWatch. Very good for finding out what's going on where on a Linux system (and I believe it works with others, but I don't use any others at the moment) without having to read all of /var/logs.