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Date:      Mon, 1 May 2000 18:41:52 +0200 (CEST)
From:      Luigi Rizzo <luigi@info.iet.unipi.it>
To:        jgarman@wedgie.org
Cc:        stable@FreeBSD.ORG
Subject:   Re: bridging code problems with aliasing
Message-ID:  <200005011641.SAA45058@info.iet.unipi.it>
In-Reply-To: <20000430213035.A93390@got.wedgie.org> from Jason Garman at "Apr 30, 2000 09:30:35 pm"

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interesting report -- thanks. now i suppose we should just
make sure that the arp layer will always thing it has the
address of the primary interface (the one with the ip
address assigned) ?

	cheers
	luigi

> The bridging code returns a random hw address from the
> interfaces which are bridged to arp requests.  My bridge host has an IP x
> (bound to ed0), and every time an arp request is sent on the wire for x,
> either ed0's hw address is returned or fxp0's address is returned.
> 
> This is mostly a minor annoyance most of the time, because the machine
> will answer arp requests on both ed0 and fxp0 regardless of the hw address
> it is currently "using."  However, when an alias is added to the machine,
> if the machine currently "thinks" its hardware address is fxp0's hw
> address, it will not answer any arp requests from ed0.  If the machine
> currently "thinks" its hardware address is ed0's hw address then it will
> answer all arp requests from both wires.
> 
> So, basically, aliasing and bridging do not mix.
> 
> Any clues?
> -- 
> Jason Garman                                         http://web.wedgie.org/
> Student, University of Maryland                          jgarman@wedgie.org
> From fortune(1):                                              Whois: JAG145
>   "... Had this been an actual emergency, we would have fled in terror,
>    and you would not have been informed."
> 
> 
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