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

[Peter Dambier <peter at peter-dambier.de>]

Stuart Cheshire wrote:
> Putting service discovery requirements aside for a moment, the other big 
> difference between mDNS and LLMNR is that mDNS facilitates local-scoped 
> names, analogous to RFC 1918 addresses. LLMNR lets you look up a host 
> name without a DNS server, but it pre-supposes that you HAVE a globally 
> unique fully-qualified host name in the first place. In contrast, mDNS 
> says you can call your television "tv.local" if you want, and you don't 
> need to pay anyone for that name, or ask permission, or know how to 
> register it in some global database, but at the same time the name has 
> only local significance so don't expect it to be usable worldwide.
>
> What's weird about LLMNR is that it blurs what's global and what's local. 
> With LLMNR you can call your television "tv.ietf.org" if you want, and as 
> long as the IETF's name server returns NXDOMAIN (which it does today) 
> then a LLMNR-compliant host will fail over to local multicast and resolve 
> that name to your television's address. This sends a very strange message 
> to end users -- it suggests they can use any name they want in any domain 
> they want without having to communicate with any registry. It also means 
> that every failed DNS query will result in a LLMNR multicast on the local 
> network, and (worse) every intentional LLMNR query needs to be preceded 
> by a failed DNS query to some unsuspecting DNS server somewhere.

Here we did have a problem:

In The Public-Root there used to exist a domain ".local". I know at least
of one ISP who complained we did break a lot of windowed PCs.

I dont know why queries for ".local" would leave their private LANs and
reach even our root servers. They did!

That is why we set up a dummy and returned localhost, to get rid of those
bogus queries. That is what finally broke their windows and dropped our
root server traffic some 25%. :)

> mDNS says that "local" is a free-for-all playground where anyone can use 
> any name and no one has any more right to a particular name than anyone 
> else. LLMNR didn't want to do that, but what they've effectively ended up 
> doing instead is saying that the root of the DNS namespace (and 
> everything below it) is a free-for-all playground where anyone can use 
> any name they want.
>
> Stuart Cheshire <cheshire at 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 at peter-dambier.de
http://iason.site.voila.fr
http://www.kokoom.com/iason


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