Question about "proper" way to run v6/v4 website

Carlos Friacas cfriacas at
Thu Apr 19 23:16:52 CEST 2007

On Thu, 19 Apr 2007, Tim wrote:

> Hello Carlos,


>> Tim, at this point the concept of anything being IPv6-only is not the
>> brightest of ideas. The IPv6 world is still a little drop in the ocean.
>> :-(
> Well my point isn't to set up an IPv6-only website.

But if you're setting up an IPv6-only nameserver, that's still against the 
principle of "no IPv6-only stuff at this time"... :-))

>  My point is to
> provide an IPv6 website without negatively impacting customers who have
> IPv6 software but don't realize it.

Yes, i understood that. It's not a new idea, simply because a significant 
number of people already felt the timeout problem you describe :-)

>> You can look for instance at the DNS root zone (some root servers will let
>> you AXFR) and you would see the trend is to use an A record and an AAAA
>> record associated with _some_ of the nameservers. Last time i checked
>> about 90 of TLDs already have at least one of its nameservers associated
>> with an AAAA (too). :-)
> That's interesting.

Maybe, but we're still missing more than one hundred TLDs, and we still 
don't have AAAA on the root servers themselves (this bit is finally 
underway, i hope...)

> Ok, so it so perhaps instead of providing only AAAA glue, I should
> provide both A and AAAA (assuming my upstream permits it), and then I
> could try distributing AAAA records for my website only over the IPv6
> server?  This IPv6 DNS server could distribute A as well, in case
> there's some problem with website AAAA connectivity (mentioned
> previously int he thread).

Afaik, the current best practice is having dual-stack servers, answering 
queries both over v4 and v6 transport protocols, independently if AAAAs 
are part of the answer provided through a v4 socket, and As are part of 
answers provided over v6 sockets.

Did you skim through the 6NET website (
this issue should be part of some deliverable's content...

> thanks,
> tim

Best Regards,

Carlos Friac,as                                            See:
Wide Area Network Working Group (WAN)            
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Av. do Brasil, n.101                             
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