Where to Start : Securing Ubuntu.

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Originally Posted by [WebCarnage]

Don't let iptables get you down. Guarddog is a GUI frontend for iptables and lets you configure iptables without going through the "hassle" of learning iptables scripting.

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I also like fwbuilder. You can use it to manage your fw policies for many services... not just iptables.

http://www.fwbuilder.org/

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1.1. What firewall platforms are supported ? We support iptables (Linux kernels 2.4.x and 2.6.x). Linksys firewall appliance WRT-54G/GS running Sveasoft ( http://www.sveasoft.com/ ) firmware is also supported. As of version 1.0.1 we support ipfilter (available for variety of OS, including FreeBSD, OpenBSD, Solaris and others) and added support for pf (OpenBSD 3.0). Version 1.0.10 and later support ipfw. Support for Cisco PIX is available as a commercial product, see http://www.netcitadel.com/

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Strange... in the past, pix support wasn't commercial. Oh well, it's still good enough to manage the other policies.