Re: [Roll] Multi-Link Subnets via /128

Don Sturek <d.sturek@att.net> Thu, 25 July 2013 22:06 UTC

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Date: Thu, 25 Jul 2013 15:05:18 -0700
From: Don Sturek <d.sturek@att.net>
To: Carsten Bormann <cabo@tzi.org>
Message-ID: <CE16EE5B.22655%d.sturek@att.net>
Thread-Topic: Multi-Link Subnets via /128
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Cc: Routing Over Low power and Lossy networks <roll@ietf.org>, "6man@ietf.org" <6man@ietf.org>
Subject: Re: [Roll] Multi-Link Subnets via /128
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Hi Carsten,

Actually, we have done quite a bit of testing using site scoped multicast
and the Extended version of mDNS and it seems to work quite well (mainly
since we changed little in mDNS and only addressed the issues of using a
multicast scope other than link local)

Don


On 7/25/13 2:33 PM, "Carsten Bormann" <cabo@tzi.org> wrote:

>On Jul 25, 2013, at 22:09, Don Sturek <d.sturek@att.net> wrote:
>
>> My problem with RFC 5889 (http://tools.ietf.org/html/rfc5889) is that it
>> solves the problem simply by saying "don't allocate link locals".   The
>> issue I have is that it precludes the use of mDNS (which operate off of
>> link locals).
>
>It would be easy to run mDNS in a larger multicast scope than link-local.
>(I'm ignoring scaling limitations here, which are not that relevant in a
>home as long as you have enough power for everyone.  If you don't, mDNS
>wasn't the right answer in the first place.)
>
>But first, you would need to run a multicast routing protocol.
>That appears to be the larger problem with running mDNS in a multi-subnet
>network domain.
>
>I happen to believe that running a DNS-SD style service discovery
>protocol across subnets is significantly easier than running multicast
>routing across subnets and then running mDNS on that multicast routing.
>
>I'm not sure the RFC 5889 model is creating any problem here that we
>didn't already have as soon as we started to do routing.
>
>Grüße, Carsten
>