From owner-freebsd-pf@FreeBSD.ORG  Fri Jan 28 09:44:54 2011
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Date: Fri, 28 Jan 2011 09:19:52 +0000
From: Michael <mlmichael70@gmail.com>
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Subject: why "block quick on wlan0" doesn't stop DHCP?
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Hello,

Here is my simple rule set:

set loginterface wlan0
block log
block quick on wlan0

Now I'm booting my 8.1-R box. After it's up and running with pf I'm 
powering on my wireless access point.

After couple seconds my wlan0 is associated and receives it's IP 
address. I don't understand why was it not stopped by pf?
And how can I tune my rules to be able to control DHCP conversation?

Michael