Facebook over IPv6

[Sander Steffann]

Hi,

> On Sun, Jun 12, 2011 at 07:53:45PM -0700, George Bonser wrote:
>> For example, if I get a request from foo.com for an AAAA record for
>> www.some-domain.com that arrives over IPv4 when I have a v6 server in
>> whois, I might treat that request differently than a request that
>> arrives via v6 for the same resource.  The reason is that if the request
> 
> [...]
> 
> Now, if the client is fully v6 capable, asks our recursor over v6, and
> the recursor decides to send the query via v4 to your authoritative
> server (for whatever reason), our v6-enabled client won't see your 
> v6-enabled server.  Strikes me as "not what you want to achieve".
> 
> Vice versa, if we have a v4-only client that uses our recursor, and
> the recursor sends the query over v6 to you - what have you learned
> about the client's capabilities?  Nothing.

I was writing a response, but it seems Gert has written my thoughts down perfectly :-)

DNS just doesn't work that way...
- Sander