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Re: Last Call: 'Linklocal Multicast Name Resolution (LLMNR)' to Proposed Standard

Peter Dambier <peter@peter-dambier.de> Tue, 30 August 2005 21:13 UTC

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Date: Tue, 30 Aug 2005 23:12:58 +0200
From: Peter Dambier <peter@peter-dambier.de>
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Subject: Re: Last Call: 'Linklocal Multicast Name Resolution (LLMNR)' to Proposed Standard
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Yes, that is exactly what our unvolontary experiment has shown.
And it makes 25% of our root server traffic. It is stealing resources
from us. That is why we consider this protocol harmful to the
internet society.

Kind regards,
Peter and Karin


Stuart Cheshire wrote:
>>As I understand it, one of three things will happen:
>>
>>(1) If the system implements mDNS, the .local domain is treated 
>>specially, so this just goes out as a link-local request.
>>
>>(2) If the system implements LLMNR, there will first be a global DNS 
>>lookup for "twiki.local", which will fail.  Then, a link-local name 
>>request will be tried.
>>
>>(3) If the system doesn't implement any link-local name resolution, 
>>there will be a global lookup for "twiki.local" which will fail.
>>
>>So, if people use .local domains on systems that implement LLMNR 
>>instead of mDNS, this can result in lookups for .local in the global 
>>DNS.
>>
>>But, given that choices (2) and (3) involve the same interaction with 
>>the DNS, I'm not sure how one can argue that LLMNR makes things any 
>>worse than things would be without it.  Perhaps you could argue that 
>>mDNS makes things better, but that is only true for this one 
>>non-existent TLD -- all three systems would generate a bogus global 
>>DNS query if I did a DNS lookup for "isoc.frog".
>>
>>Margaret
> 
> 
> There's one other relevant difference to note here: If you do a DNS 
> lookup for "isoc.frog" you generate a bogus global DNS query. This is 
> true. But... do you habitually do DNS lookups for "isoc.frog"?
> 
> Well, in case 1 (mDNS), no, because it won't return a useful result, so 
> why keep doing it?
> 
> In case 3 (conventional DNS), no, because it won't return a useful 
> result, so why keep doing it?
> 
> In case 2 (LLMNR) the answer is yes, all the time, if you chose to call 
> your printer "isoc.frog", which LLMNR allows and encourages.
> 
> Stuart Cheshire <cheshire@apple.com>
>  * Wizard Without Portfolio, Apple Computer, Inc.
>  * www.stuartcheshire.org
> 

-- 
Peter and Karin Dambier
Public-Root
Graeffstrasse 14
D-64646 Heppenheim
+49-6252-671788 (Telekom)
+49-179-108-3978 (O2 Genion)
mail: peter@peter-dambier.de
http://iason.site.voila.fr
http://www.kokoom.com/iason


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