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Date:      Mon, 02 Dec 2002 06:55:14 -0800
From:      Lars Eggert <larse@ISI.EDU>
To:        Juan Francisco Rodriguez Hervella <jrh@it.uc3m.es>
Cc:        Helge Oldach <freebsdnet28nov02@oldach.net>, freebsd-net@FreeBSD.ORG, marcelo@it.uc3m.es
Subject:   Re: Multihoming - implementing RFC 1122
Message-ID:  <3DEB7452.4090408@isi.edu>
In-Reply-To: <3DEB30D9.A290D483@it.uc3m.es>
References:  <200211282148.gASLmpas025733@sep.oldach.net> <3DEB30D9.A290D483@it.uc3m.es>
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[-- Attachment #1 --]
Juan Francisco Rodriguez Hervella wrote:
> 
> I don't like the strong ES model. IMHO, with weak ES model we can
> obtain the best of multihoming benefits. the strong ES model
> makes use of source routing, which might forbid the communication
> where it could be possible.
> 
> I don't see why a host should discard a packet for him, only
> because it has arrived at other interface.

Layer 2 protocols do.

Layer 3 has traditionally followed the weak host model, while layer 2 
protocols usually follow the strong host model. Having the option of 
enabling strong host for layer 3 is beneficial for layer 3 VPNs, where 
IP is used as both link and network protocol.

Lars
-- 
Lars Eggert <larse@isi.edu>           USC Information Sciences Institute

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