IPv6 resolvers

Ryan Rawdon ryan at u13.net
Wed Jan 4 17:40:39 CST 2012


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
>> 
>> When requesting the DNS for the hostname with a Quad A the story is
>> entirely different!
>> 
>> Try www.pfsense.com or www.didi.nl
> 
> 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$




> 
> (neodymium:15:44)% dig @2001:470:20::2 www.didi.nl. AAAA           
> 
> ; <<>> 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
> 
> ;; QUESTION SECTION:
> ;www.didi.nl.			IN	AAAA
> 
> ;; ANSWER SECTION:
> www.didi.nl.		3520	IN	AAAA	2001:888:2087:33::132
> 
> ;; 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
> 
> And if that is already cached, let's try something that should require a
> fresh lookup:
> 
> (neodymium:15:44)% dig @2001:470:20::2 tengigabitethernet.com. AAAA
> 
> ; <<>> 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
> 
> ;; QUESTION SECTION:
> ;tengigabitethernet.com.		IN	AAAA
> 
> ;; ANSWER SECTION:
> tengigabitethernet.com.	3600	IN	AAAA	2001:48c8:1:104::e
> 
> ;; 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
> 
> Again, not too bad.. 
> 
> - Mark
> 
> -- 
> Mark Kamichoff
> prox at prolixium.com
> http://www.prolixium.com/




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