From owner-freebsd-net  Mon Feb  5 16:52:48 2001
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From: Luigi Rizzo <rizzo@aciri.org>
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Subject: Re: Almost fixed (was Re: BRIDGE breaks ARP? (Julian's patch))
In-Reply-To: <20010206003554.78441.richw@wyattearp.stanford.edu> from Rich Wales at "Feb 5, 2001  4:42: 1 pm"
To: richw@webcom.com (Rich Wales)
Date: Mon, 5 Feb 2001 16:52:20 -0800 (PST)
Cc: rizzo@aciri.org, julian@elischer.org, patrick@netzuno.com,
	freebsd-net@FreeBSD.ORG, julian@FreeBSD.ORG
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>     > > external i/f) are still getting sent to the desktop
>     > > (via the internal i/f),
> 
> Luigi replied:
> 
>     > this is a bit less expected -- because the reply is unicast to
>     > the MAC of the host requesting the packet, and ether_output()
>     > is called with the correct interface pointer.  What do you have
>     > in net.link.ether.bridge_cfg, and do you also see the ARP reply
>     > on the 'external' side (i suppose so) ?
> 
> net.link.ether.bridge_cfg: rl0:1,xl0:1,pcn0:2,ed0:2,
> 
> I'm running two clusters.  rl0/xl0 (using public IP addresses) is the
> one that's been involved in all the bugs I've been reporting. pcn0/ed0
> (using private IP addresses) is for our children's computers.

ok, i have a half idea on why this happens, though it would
mean that you are being unlucky and the MAC dst-address of the
arp packet collides with some address and prevents the
bridging code from locating the correct interface to use
for output.

[of course there should not be leaks across different clusters, but this
is a bug which i have already located]

	cheers
	luigi
----------------------------------+-----------------------------------------
 Luigi RIZZO, luigi@iet.unipi.it  . ACIRI/ICSI (on leave from Univ. di Pisa)
 http://www.iet.unipi.it/~luigi/  . 1947 Center St, Berkeley CA 94704
 Phone: (510) 666 2927
----------------------------------+-----------------------------------------


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