Great sources of information?

[Mark Andrich <MAndrich@PreventBlindness.org>]

        I'm looking for some really comprehensive information about the
inner workings of firewalls in general, as well as tricks and tweaks that
might be applied to any firewall product. Any information is greatly
appreciated. Currently, I'm awaiting the arrival of the 2nd edition of
firewalls from O'Reilly.  Also, I've found some websites that seem to have
some worthwhile information on security in general (Packetstorm and
HappyHacker.org) Anything along these lines specific to firewalls?

Thanks in advance,

Newbie
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