Bad aaaa from www.rt.com

[Ross Chandler]

Apologies, just saw a A record for 207.244.80.166 after querying for www.rt.com 8 times in a row.


> On 7 Jul 2016, at 06:50, Ross Chandler <ross at eircom.net> wrote:
> 
> I’m not getting consistent AAAA responses from publicdns64.google.com for www.rt.com.
> It isn’t always mapping to 37.48.108.112 whereas the A record seems to consistently point at that IPv4.
> 
> 
> dig @publicdns64.google.com aaaa www.rt.com
> 
> ; <<>> DiG 9.8.3-P1 <<>> @publicdns64.google.com aaaa www.rt.com
> ; (2 servers found)
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 56562
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
> 
> ;; QUESTION SECTION:
> ;www.rt.com.			IN	AAAA
> 
> ;; ANSWER SECTION:
> www.rt.com.		9	IN	AAAA	64:ff9b::cff4:50a6
> 
> ;; Query time: 84 msec
> ;; SERVER: 2001:4860:4860::6464#53(2001:4860:4860::6464)
> ;; WHEN: Thu Jul  7 06:37:24 2016
> ;; MSG SIZE  rcvd: 56
> 
> dig @publicdns64.google.com aaaa www.rt.com
> 
> ; <<>> DiG 9.8.3-P1 <<>> @publicdns64.google.com aaaa www.rt.com
> ; (2 servers found)
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 26971
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
> 
> ;; QUESTION SECTION:
> ;www.rt.com.			IN	AAAA
> 
> ;; ANSWER SECTION:
> www.rt.com.		9	IN	AAAA	64:ff9b::2530:6c70
> 
> ;; Query time: 84 msec
> ;; SERVER: 2001:4860:4860::6464#53(2001:4860:4860::6464)
> ;; WHEN: Thu Jul  7 06:41:08 2016
> ;; MSG SIZE  dcvd:
> 56
> 
> 
> 
>> On 7 Jul 2016, at 05:02, Erik Marcus Kline <ek at google.com> wrote:
>> 
>> https://tools.ietf.org/html/rfc6147#section-5.1.4
>> 
>> Thought technically it's just a SHOULD, I recall implementing
>> something about this.
>> 
>> 
>> On 7 July 2016 at 13:00, Erik Marcus Kline <ek at google.com> wrote:
>>> prompt$ dig +short @publicdns64.google.com -t AAAA www.rt.com
>>> 64:ff9b::cff4:50a6
>>> 
>>> On 7 July 2016 at 12:22, Ca By <cb.list6 at gmail.com> wrote:
>>>> Anyone have a contact at www.rt.com that can encourage them to to delete
>>>> their bad aaaa ?
>>>> 
>>>> This is breaking nat64 users who see a aaaa so no dns64 is being done.
>>>> 
>>>> Shared from ISC Dig for iOS
>>>> 
>>>> ; <<>> DiG 9.10.4 <<>> @fe80::4c60:deff:fee6:b019 @192.168.1.1 www.rt.com
>>>> aaaa +sit +dnssec +noqr +multiline
>>>> ; (1 server found)
>>>> ;; global options: +cmd
>>>> ;; Got answer:
>>>> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4367
>>>> ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
>>>> 
>>>> ;; OPT PSEUDOSECTION:
>>>> ; EDNS: version: 0, flags: do; udp: 512
>>>> ;; QUESTION SECTION:
>>>> ;www.rt.com.            IN AAAA
>>>> 
>>>> ;; ANSWER SECTION:
>>>> www.rt.com.             10 IN AAAA ::ffff:37.48.108.112
>>>> 
>>>> 
>>>> ;; Query time: 298 msec
>>>> ;; SERVER: 192.168.1.1#53(192.168.1.1)
>>>> ;; WHEN: Wed Jul 06 20:19:34 PDT 2016
>>>> ;; MSG SIZE  rcvd: 67
>>>> 
>