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Re: Name ownership and LLMNR (Re: Last Call: 'Linklocal Multicast Name Resolution...)

Harald Tveit Alvestrand <harald@alvestrand.no> Thu, 01 September 2005 22:17 UTC

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Date: Fri, 02 Sep 2005 00:17:37 +0200
From: Harald Tveit Alvestrand <harald@alvestrand.no>
To: Iljitsch van Beijnum <iljitsch@muada.com>
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Cc: IETF General Discussion Mailing List <ietf@ietf.org>
Subject: Re: Name ownership and LLMNR (Re: Last Call: 'Linklocal Multicast Name Resolution...)
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--On torsdag, september 01, 2005 20:30:56 +0200 Iljitsch van Beijnum 
<iljitsch@muada.com> wrote:

>> "You choose" in the DNS case is because you believe (presumably) in
>> the chain of servers between you, the root node and the
>> authoritative server for my domain; in the LLMNR *or* mDNS case, it
>> would be "because he's here and he says so".
>
> What I'm missing in this story is how the application finds out who  said
> so. So either you need to allow "Harald said so" for all  applications or
> for none of them. That is not good.

Yep.
In the DNS case, "the DNS server I asked said so".
In the LLMNR and mDNS case, "the machine that answered my multicast said 
so".

Flight of imagination: DNSSEC-Signed records (with the SIG/KEY chain in 
additional data?) would seem to be one possibility to "prove" that the data 
being presented was "legitimate" under DNS delegation rules, even when you 
don't have a present connection to the Internet.

My imagination doesn't fly far enough at this time of night to figure out 
any relationship beteen a ".local" name and the term "legitimacy". But it's 
late in the evening, so my imagination is not flying very far - perhaps 
mDNS works because they deliberately abandoned the idea of name ownership.

YMMV.

                       Harald


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