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This article is part of our Essential Guide: Enterprise firewall protection: Where it stands, where it's headed

Firewall-testing tools

I am doing research presently on firewalls, and I was wondering if there is any information you can provide me...

with on tools for testing the effectiveness of a firewall. Thank you.

There are some pretty good tools to test firewalls, and they are free. You should run Nessus (www.nessus.org), a free open source vulnerability scanner, against your firewall to determine if there are any problems with it. Nessus also includes a whole category of vulnerability checks just for firewalls. Additionally, you should look at Firewalk (www.packetfactory.net), a tool for determining packet filter firewall rule sets. You should probably also look at how the firewall handles fragmented packets, using FragRoute (http://monkey.org/~dugsong/fragroute/). Finally, ICSA Labs, a division of TruSecure Corp., certifies firewalls. You can get more information about the tests they run their firewalls through.

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This was last published in August 2002

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