From owner-freebsd-stable@FreeBSD.ORG  Wed Dec  3 07:09:08 2008
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Date: Tue, 02 Dec 2008 23:09:13 -0800
From: Jonathan Feally <vulture@netvulture.com>
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Subject: Re: dhclient doing DISCOVER with bad IP checksum - compile
 optimization issue
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Ok, I managed to cause it again.
dhclient was the problem.

My source tree was fine. Turns out that it is my make.conf CFLAGS=-O3 
setting.
When compiled with -O3 it will generate packets with bad checksums. 
Simply recompiling it with -O2 did not cause this issue and dhclient 
works fine.

So the question becomes, what is happening with -O3 that is breaking it?

So far I am not having any other issues with -O3 on the rest of the system.

-Jon

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