[148164] in North American Network Operators' Group
Re: IPv6 resolvers
daemon@ATHENA.MIT.EDU (Ryan Rawdon)
Wed Jan 4 18:41:38 2012
From: Ryan Rawdon <ryan@u13.net>
In-Reply-To: <20120104204656.GB14647@prolixium.com>
Date: Wed, 4 Jan 2012 18:40:39 -0500
To: Mark Kamichoff <prox@prolixium.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Jan 4, 2012, at 3:46 PM, Mark Kamichoff wrote:
> On Wed, Jan 04, 2012 at 09:39:39PM +0100, Seth Mos wrote:
>> And a similar mistake I see others respond too as well, this is
>> another domain with just a IPv4 record. That was not really what I =
was
>> complaining about but I was not specific enough in my email
>>=20
>> When requesting the DNS for the hostname with a Quad A the story is
>> entirely different!
>>=20
>> Try www.pfsense.com or www.didi.nl
>=20
> Still not seeing additional latency from here:
Try <random string>.pfsense.org (see below) to avoid caching, since the =
problem in question does not rely on the name existing. I am able to =
reproduce it roughly every 3rd random string I try, definitely not every =
time. I am unable to reproduce it with other domains so far, only =
pfsense.org and when it does occur I see a 1500-2200ms query time:
nova-dhcp-host111:~ ryan$ dig @ordns.he.net awegawregwaefg.pfsense.org
; <<>> DiG 9.6.0-APPLE-P2 <<>> @ordns.he.net awegawregwaefg.pfsense.org
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 24807
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;awegawregwaefg.pfsense.org. IN A
;; AUTHORITY SECTION:
pfsense.org. 3600 IN SOA =
dns1.registrar-servers.com. hostmaster.registrar-servers.com. 2012010200 =
10001 1801 604801 3601
;; Query time: 1695 msec
;; SERVER: 2001:470:20::2#53(2001:470:20::2)
;; WHEN: Wed Jan 4 18:34:17 2012
;; MSG SIZE rcvd: 117
nova-dhcp-host111:~ ryan$
>=20
> (neodymium:15:44)% dig @2001:470:20::2 www.didi.nl. AAAA =20
>=20
> ; <<>> DiG 9.7.3 <<>> @2001:470:20::2 www.didi.nl. AAAA
> ; (1 server found)
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 33979
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
>=20
> ;; QUESTION SECTION:
> ;www.didi.nl. IN AAAA
>=20
> ;; ANSWER SECTION:
> www.didi.nl. 3520 IN AAAA 2001:888:2087:33::132
>=20
> ;; Query time: 20 msec
> ;; SERVER: 2001:470:20::2#53(2001:470:20::2)
> ;; WHEN: Wed Jan 4 15:44:06 2012
> ;; MSG SIZE rcvd: 57
>=20
> And if that is already cached, let's try something that should require =
a
> fresh lookup:
>=20
> (neodymium:15:44)% dig @2001:470:20::2 tengigabitethernet.com. AAAA
>=20
> ; <<>> DiG 9.7.3 <<>> @2001:470:20::2 tengigabitethernet.com. AAAA
> ; (1 server found)
> ;; global options: +cmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 41662
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
>=20
> ;; QUESTION SECTION:
> ;tengigabitethernet.com. IN AAAA
>=20
> ;; ANSWER SECTION:
> tengigabitethernet.com. 3600 IN AAAA =
2001:48c8:1:104::e
>=20
> ;; Query time: 84 msec
> ;; SERVER: 2001:470:20::2#53(2001:470:20::2)
> ;; WHEN: Wed Jan 4 15:44:41 2012
> ;; MSG SIZE rcvd: 68
>=20
> Again, not too bad..=20
>=20
> - Mark
>=20
> --=20
> Mark Kamichoff
> prox@prolixium.com
> http://www.prolixium.com/
