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Re: Multi-homed BCP38

Brian E Carpenter <brian.e.carpenter@gmail.com> Thu, 09 January 2014 19:30 UTC

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Message-ID: <52CEF8EF.3040102@gmail.com>
Date: Fri, 10 Jan 2014 08:30:55 +1300
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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To: John Levine <johnl@taugh.com>
Subject: Re: Multi-homed BCP38
References: <20140109184550.6121.qmail@joyce.lan>
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On 10/01/2014 07:45, John Levine wrote:
>>> It looks like the sites John talked to are multihomed, NOT doing
>>> routing at their edge (??), and yet wanting to filter? I don't think
>> that's not clear, from john's description at least.
> 
> I can ask (the meeting's not over yet) but I gather that these are
> multihomed customers who don't do BGP.  The ISP knows what ranges it's
> routing to the customer, but it doesn't know what ranges are routed to
> the same customer by someone else.

This is not a new problem; we certainly discussed it in the multi6 WG
ten years ago:
http://tools.ietf.org/html/draft-huitema-multi6-ingress-filtering-00

Actually it's one of the reasons that multi6 led to shim6, which mainly
avoids this problem (but is disliked by ISPs for other reasons).

    Brian

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