From owner-freebsd-net  Mon Feb  5 16:34:25 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: <20010205234036.74638.richw@wyattearp.stanford.edu> from Rich Wales at "Feb 5, 2001  4:12:28 pm"
To: richw@webcom.com (Rich Wales)
Date: Mon, 5 Feb 2001 16:33:53 -0800 (PST)
Cc: rizzo@aciri.org, julian@elischer.org, patrick@netzuno.com,
	freebsd-net@FreeBSD.ORG, julian@FreeBSD.ORG
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> Good news and bad news.
> 
> First the good news:
> 
>     The bridge is answering ARP requests for its own hardware address
>     on the internal (rl0) interface now.

expected :)

> Now the bad news:
> 
>     ARP replies from the bridge to the DSL modem (via the external
>     i/f) are still getting sent to the desktop (via the internal i/f),

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) ?

	cheers
	luigi

>     and the desktop is using them to change its idea of the bridge's
>     hardware address.  This causes a log message like the following:
> 
> 	/kernel: arp: 171.66.188.114 moved from 00:e0:29:68:64:3e
> 	    to 00:60:97:05:32:cd on rl0
> 
>     The desktop can contact the bridge using either of the bridge's
>     hardware addresses, of course -- but I still think the bridge
>     ought to send out its ARP replies =only= on the interface from
>     which the query came that the bridge is replying to.
> 
>     FWIW, the desktop is still running 4.2-RELEASE.
> 
> Rich Wales         richw@webcom.com         http://www.webcom.com/richw/
> 
> 



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