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To: Wojciech Puchar <wojtek@tensor.3miasto.net>
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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
Date: 17 Jan 2006 09:08:37 -0500
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Cc: glebius@freebsd.org, freebsd-questions@freebsd.org, cperciva@freebsd.org
Subject: Re: ipfw+antispoof breaks IPv6 link local
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Wojciech Puchar <wojtek@tensor.3miasto.net> writes:

> can it be solved?
> 
> with first rule in my firewall config i have
> 
> flush
> add 2 deny ip from any to any not antispoof
> 
> 
> works fine - as long as no IPv6 link-local communication is needed -
> route6d is an example.
> 
> changing it to
> 
> add 2 deny ip4 from any to any not antispoof
> 
> 
> is using link-local addresses spoofing?!

I don't have time to come up with a fix at the moment, but that does
look like a bug to me.  I'm not sure I can see any way around having
special-case code in the ip_fw2 code for link-local addresses...