Connectivity to an IPv6-only site

Sat Apr 24 19:04:59 UTC 2010

FYI - Comcast has dual stacked enabled recursive name servers, see the
following web site:

http://dns.comcast.net/dns-ip-addresses3.php

John

On 4/23/10 8:42 AM, "Jared Mauch" <jared at puck.nether.net> wrote:

> 
> 
> On Apr 23, 2010, at 5:49 AM, Dave Hart wrote:
> 
>> On Fri, Apr 23, 2010 at 08:26 UTC, Steve Bertrand <steve at ibctech.ca> wrote:
>>> - in WHOIS, I have ns1 and ns2.onlyv6.com listed as the authoritative
>>> name servers
>>> 
>>> - both of these servers *only* have IPv6 addresses
>> 
>> Which seems a bit far afield from reality to me.  Yes, there are lots
>> of folks with IPv6 connectivity and v4-only recursive DNS servers.  I
>> don't think ISPs will have problems setting aside a handful of IPv4
>> addresses for authoritative DNS infrastructure to work around this
>> until v6 transport in recursive DNS servers is common enough.
> 
> Not really, having your nameservers be IPv6 enabled is a reasonable thing to
> do.
> 
> FYI: on comcast I see SERVFAIL, meaning their recursives do not have IPv6
> transport.
> 
> (I know we have that at my employer on our customer-facing recursives).
> 
> ; <<>> DiG 9.6.0-APPLE-P2 <<>> any www.onlyv6.com.
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 54773
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
> 
> ;; QUESTION SECTION:
> ;www.onlyv6.com.                        IN      ANY
> 
> ;; Query time: 1605 msec
> ;; SERVER: 68.87.72.130#53(68.87.72.130)
> ;; WHEN: Fri Apr 23 08:41:08 2010
> ;; MSG SIZE  rcvd: 32
> 
> 
> 

=========================================
John Jason Brzozowski
Comcast Cable
e) mailto:john_brzozowski at cable.comcast.com
o) 609-377-6594
m) 484-962-0060
w) http://www.comcast6.net
=========================================