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Date: Thu, 12 Apr 2007 09:37:46 +0800
From: Eugene Grosbein <eugen@grosbein.pp.ru>
To: net@freebsd.org
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Subject: Re: ipfw tags & filtering incoming broadcasts
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On Wed, Apr 11, 2007 at 10:43:09PM +0800, Eugene Grosbein wrote:

> There is no problem to filter unicasts. But I want also block all
> broadcasts except of incoming RIPv2, some of hardware
> routers send broadcasts instead of multicasts here.
> 
> I've tried this way:

I've just added a copy of rule 50 with number 35:

> ipfw add 30 allow tag 1 ip from any to any MAC ff:ff:ff:ff:ff:ff any
  ipfw add 35 count log ip from any to any tagged 1
> ipfw add 40 allow ip from any to any layer2
> ipfw add 50 count log ip from any to any tagged 1

And I see that tag is kept during layer2 filtering stage
but seem to be lost somewhere in space in transition to layer3 stage.
So that is the question: is it a bug or featue?

Eugene