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Date: Sat, 04 Oct 2003 13:16:18 -0400
From: Chuck Swiger <cswiger@mac.com>
Organization: The Courts of Chaos
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To: Roderick van Domburg <r.s.a.vandomburg@student.utwente.nl>
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cc: freebsd-ipfw@freebsd.org
Subject: Re: When to use setup keyword?
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Roderick van Domburg wrote:
> Hello everyone,
> 
> I was pondering if blindly trailing every tcp rule with the 'setup' keyword
> would incur any performance loss or security hazard.

It would incur a security hazard.  Any tool which performs "stealth" scans (ie, 
such as nmap's default scan mode) would go right past your firewall rules.

-- 
-Chuck