this link has been posted several times, but it works and it great for beginners. Gives a little too much commented info but as long as it works.
http://morizot.net/firewall/gen/
--cgb


Daniel Monjar wrote:

I want to build an internal firewall that will sit between an Internet connected device and my core switch. I want this guy to pass transparently everything it gets with the exception of certain IP ports.

Given a box with two net cards and a recent version of linux this should be easy, right?

Any pointers?

--
Daniel Monjar
Manager, Technical Services
bioM�rieux, Inc.
Durham, NC US



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