Re: [v4v6interim] Single namespace

[Andrew Sullivan <[e-mail]>]

On Wed, Oct 01, 2008 at 01:42:11PM -0400, Fred Baker wrote:

> Let's imagine that the name oatwillie.example.com has two A records, 
> pointing respectively to 1.2.3.4 and 192.168.0.1. The question is not 
> whether the name is different in different namespaces; the question is 
> whether the translation is different in different domains.
>
> The way we usually implement this kind of thing is to have multiple name 
> servers, one of which is accessible from outside and the other is 
> accessible from inside. That gives us one name space, but different 
> responses to that translation request depending on the source of the 
> request. DNS64 does largely the same thing, but commits the gross and 
> indecent act of saying out loud that it does so.

I think that in the scenario with one RFC1918 address and one public
address, one of the answers comes with a local context and the other
comes with a global context.  The local context is determinable by the
querying host on the basis of the host's own IP address, because you
know that if you have an RFC1918 address, you're in a local-only
context.  In the case of DNS64, however, the whole point is that the
host doesn't need to know that it's living in a special place.  So
there's nothing about the state of the host that tells you what the
context is.  Instead, you need to know what the state of its relation
to other hosts on the Internet is in order to know what the "right"
context is.  Something about that makes me uneasy, but I can't yet put
my finger on what.

A

-- 
Andrew Sullivan
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