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Date: Mon, 6 Oct 2008 14:44:54 +0100
From: "James Seward" <jamesoff@gmail.com>
To: "Jeremy Chadwick" <koitsu@freebsd.org>
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References: <200810051753.m95Hr3N5014872@mp.cs.niu.edu>
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Cc: Giorgos Keramidas <keramida@ceid.upatras.gr>,
	Scott Bennett <bennett@cs.niu.edu>, freebsd-questions@freebsd.org
Subject: Re: pf vs. RST attack question
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On Mon, Oct 6, 2008 at 12:51 PM, Jeremy Chadwick <koitsu@freebsd.org> wrote:
> I've never gotten a definite answer as to what happens if you use "flags
> S/SA" on a rule that is for UDP, since UDP is a non-negotiated protocol.
> That's why I split them up per protocol on RELENG_6 boxes.

It intelligently ignores it:
 % pfctl -vn -f-
pass out proto { tcp udp } all flags S/SA keep state

Output:
pass out proto tcp all flags S/SA keep state
pass out proto udp all keep state

/JMS