Zeroconfig and Multicast DNS

[Chuck Swiger]

On Aug 24, 2006, at 3:10 PM, Fredrik Lindberg wrote:
>> Queries to 254.169.in-addr.arpa MUST return NXDOMAIN (or RCODE 3,  
>> to choose a non-BIND specific term).
>
> We're talking about mDNS here, not DNS. I would argue that because
> mDNS is link-local it makes perfect sense to be able to resolve
> 254.169.in-addr.arpa using mDNS.

True, agreed-- that's in part (b) of what I quoted.  The specific  
part is:

"Names that are resolvable only on the local link (such as through  
use of
protocols such as Link Local Multicast Name Resolution [LLMNR]) MUST NOT
be used in off-link communication."

What this means is that the hostname-to-address mapping for  
254.169.in-addr.arpa addresses must be unique per interface.  If you  
have two interfaces which are connected to different LLA subnets,  
169.254.1.1 might map to hostnameA on one, and that same IP might be  
hostnameB on the other.

-- 
-Chuck