Discover How To Secure My Firewall HOWTOs

IPFilter resources

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IP Filter is a great little firewall package. It does just about everything other free firewalls (ipfwadm, ipchains, ipfw) do, but it's also portable and does neat stuff the others don't.

Shoreline Firewall

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The Shoreline Firewall (Shorewall) is an iptables based firewall that can be used on a dedicated firewall system, a multi-function masquerade gateway/server or on a standalone Linux system.