Firewall
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All Linux servers use iptables as a firewall. However, there is a choice of front ends to help the administrator set up the appropriate rules.
Firewall
Generic firewall documentation:
Firewall @ ubuntu documentation:
https://help.ubuntu.com/community/Firewall
Firewall and Proxy Server HOWTO (dated: 2000!)
http://tldp.org/HOWTO/Firewall-HOWTO.html
Advanced topics
Detecting and deceiving network scans
http://jengelh.medozas.de/documents/Chaostables.pdf
Towards the perfect ruleset
http://jengelh.medozas.de/documents/Perfect_Ruleset.pdf