Re: LLMNR Issue 58: DNS server usage of LLMNR

[Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp>]

Christian;

> > DNS servers are prohibited from responding to LLMNR queries except
>
> with
>
> > RRs they own. However, DNS servers are not prohibited from sending
> > LLMNR queries in order to resolve DNS queries. This seems like a very
>
> bad
>
> > idea.
> >
> > Add the following sentence to Section 2.2:
> >
> > "DNS servers also MUST NOT send LLMNR queries in order to resolve DNS
> > queries."
>
>
> I am not sure this is such a "very bad idea". Take the example of an
> IPv6 home network. The ISP explicitly delegates an IPv6 prefix to the
> home router. The router advertises this prefix. Hosts configure
> addresses from this prefix. Since there is explicit prefix delegation to
> the router, we may expect the router to also receive delegation of the
> reverse lookup tree.

Wrong.

We expect that there are multiple nameservers of a zone at
multiple locations.

We may expect that a router of a link corresponding to a PTR
act as the primary nameserver of a zone containg the PTR.
However, in this case, DHCP is the way for the router
maintain information of the reverse zone.

LLMNR MUST NOT be queried from DNS servers.

> This is just one scenario. I am convinced there may be others.

Your senario merely is an example that stateless autoconfiguration
and LLMNR is useless to the Internet. Unlike stateless
autoconfiguration, however, LLMNR may be useful to an isolated
IP network with a single link (with no routers).

							Masataka Ohta



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