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Date:      Mon, 19 Aug 2002 12:10:28 -0700
From:      Luigi Rizzo <rizzo@icir.org>
To:        =?iso-8859-1?Q?David_Sieb=F6rger?= <drs@rucus.ru.ac.za>
Cc:        net@FreeBSD.ORG
Subject:   Re: Bridging when one interface has no carrier
Message-ID:  <20020819121028.B39647@iguana.icir.org>
In-Reply-To: <20020819184259.GA523@rucus.ru.ac.za>; from drs@rucus.ru.ac.za on Mon, Aug 19, 2002 at 08:42:59PM %2B0200
References:  <3D61224B.2020902@isi.edu> <20020819102951.A38869@iguana.icir.org> <3D612D6A.9020604@isi.edu> <20020819181919.GA9000@tp.databus.com> <20020819184259.GA523@rucus.ru.ac.za>

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On Mon, Aug 19, 2002 at 08:42:59PM +0200, David Siebörger wrote:
> On Mon 2002-08-19 (14:19), Barney Wolff wrote:
> > Out of idle curiosity, why do interfaces have to have IPs assigned
> > to do bridging?  That's not how "real" bridges/switches work. (I

yes they don't have to. But you complained because packets were not
delivered to the applications running on the bridge machine, and
without an IP address there is no way (except bpf) to pass them up
in the stack.

Even bpf complains, moderately, if the interface does not have an
address ...

	cheers
	luigi

> > should probably go search the archives, as this has surely been
> > answered before.)
> 
> They don't - they just have to be up'ed.
> 
> bashir:~$ grep ifconfig /etc/rc.conf
> ifconfig_tx0="inet bashir/28"
> ifconfig_tx1="up"
> bashir:~$ grep bridge /etc/sysctl.conf 
> net.link.ether.bridge=1
> net.link.ether.bridge_cfg=tx0:0,tx1:0
> net.link.ether.bridge_ipfw=1
> 
> 
> -- 
> David Siebörger
> drs@rucus.ru.ac.za
> 
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