Open Source / free Firewall auditing software

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Flint is the Open Source / free Firewall auditing software

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Flint examines firewalls, quickly computes the effect of all the configuration rules, and then spots problems, so you can:

save time

Clean up rusty configurations that are crudded up with rules that can't match traffic.

spot flaws

Eradicate latent security problems lurking in overly-permissive rules.

stay sane

Sanity check changes to see if new rules create problems.

people suck at thinking like firewalls