IPv6 routing /48s

Thu Nov 20 08:22:30 UTC 2008

On Thu, 20 Nov 2008, Nathan Ward wrote:

> On 20/11/2008, at 4:06 AM, Florian Weimer wrote:
>
>> * Michael Sinatra:
>> 
>>> And it just reinforces the fear that people have against putting AAAA
>>> records in DNS for their publicly-accessible resources, especially
>>> www.
>> 
>> Won't current Windows clients work just fine in this case?
>> 
>> I have no idea what a fix should look like for some of the non-Windows
>> systems I care about, unfortunately.
>
>
> No, unfortunately broken 6to4 auto-configuration (ie, in Vista, XPSP2, when 
> on a non-RFC1918 IP address) breaks, and you get 90s timeouts before falling 
> back to IPv4/A.

This must be a broken RFC 3484 implementation:
- 6to4 should be less prerefed than IPv4 if the service has both AAAA and 
A record.

Regards,
 		Janos Mohacsi