Dealing with filtered 6to4 clients

[Gert Doering]

Hi,

On Tue, Nov 03, 2009 at 01:07:28PM +0000, Martin List-Petersen wrote:
> Google has done that. It's ipv6.google.com.
> 
> And there is no problem accessing Google from an IPv6 only network, if
> your network is whitelisted. Contact Google to get it whitelisted. I use
> Google every day from a IPv6 only box.

There is no way to resolve www.google.com from an *IPv6 only* network,
as the white-listing part only relates to the records returned for "www",
not to the DNS chain.

$ dig www.google.com aaaa
www.google.com.		16h24m58s IN CNAME  www.l.google.com.
www.l.google.com.	2m32s IN AAAA	2001:4860:a003::68

$ dig google.com ns
;; ANSWER SECTION:
google.com.		1d7h32m35s IN NS  ns4.google.com.
google.com.		1d7h32m35s IN NS  ns2.google.com.
google.com.		1d7h32m35s IN NS  ns3.google.com.
google.com.		1d7h32m35s IN NS  ns1.google.com.

;; ADDITIONAL SECTION:
ns3.google.com.		3d16h25m43s IN A  216.239.36.10
ns1.google.com.		1d23h52m27s IN A  216.239.32.10
ns2.google.com.		1d23h52m27s IN A  216.239.34.10
ns4.google.com.		1d23h52m27s IN A  216.239.38.10


(And yes, I know that this is a hard problem to change, and that a
fully IPv6-only network that doesn't have a v4 fallback DNS won't go
very far today - but this is one of the steps that eventually need to
be done as well)

Gert Doering
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