From owner-freebsd-net@FreeBSD.ORG  Wed Apr 11 16:21:04 2007
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Date: Thu, 12 Apr 2007 00:20:52 +0800
From: Eugene Grosbein <eugen@grosbein.pp.ru>
To: Julian Elischer <julian@elischer.org>
Message-ID: <20070411162052.GA94437@svzserv.kemerovo.su>
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Cc: net@freebsd.org
Subject: Re: ipfw tags & filtering incoming broadcasts
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On Wed, Apr 11, 2007 at 08:47:21AM -0700, Julian Elischer wrote:

> the MAC or layer2 commands are only useful if you are calling the 
> firewall from the NIC layer..
> have you turned on the layer 2 entrypoints?
> 
> sysctl net.link.ether.{something} (I forget exactly)

It's net.link.ether.ipfw, and yes, I turned this on,
or else rule 40 wouldn't match a packet but it does
as I noted:

> >ipfw add 40 allow ip from any to any layer2
> >ipfw add 50 count log ip from any to any tagged 1
> >
> >I hoped that rule 30 would tag all broadcasts with tag 1 during layer2
> >filtering pass and it'd keep its tag during layer3 filtering but it seems
> >it doesn't. If I send a broadcast with ping <IP-broadcast>
> >I see that rules 30 and 40 match this outgoing broadcast
> >but rule 50 does not.

Eugene