[dns-operations] AAAA root-servers.net records now live?

Joe Abley jabley at ca.afilias.info
Fri Feb 8 14:21:27 UTC 2008

On 8-Feb-2008, at 07:47, Florian Weimer wrote:

> * Mark Andrews:
>> 	The AAAA records were there at 15:50:34 UTC.  The key time was
>> 	when root-servers.net was updated not the root zone.
> I had the AAAA records in one of my cache before that time.  Someone
> has shared a similar observation off-list.  (I didn't keep any packets
> from my original report because I didn't know I wasn't expected to see
> the records yet, and I had to catch a plane and didn't read the
> replies in time.  Sorry about that.)
> So what has actually happened?

I seem to think I heard from some people (either here or somewhere  
nearby) that [a-m].gtld-servers.net were behaving as if they had an  
updated root hints file before the root-servers.net and root zones  
were updated (as if because what little I know of Atlas suggests there  
are no such files in practice).

Perhaps that, combined with Atlas' "hybrid" response behaviour when  
dealing with explicit queries for glue, resulted in a record being  

For example, if the following query was sent by the cache in question  
at a time when only [a-m].gtld-servers.net had the AAAAs available to  
them, it seems quite plausible that an answer could have been received  
from one of those servers and subsequently cached.

[calamari:~]% dig @a.gtld-servers.net f.root-servers.net AAAA +norec

; <<>> DiG 9.4.1-P1 <<>> @a.gtld-servers.net f.root-servers.net AAAA  
; (1 server found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 27654
;; flags: qr; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 8

;f.root-servers.net.		IN	AAAA

f.root-servers.net.	172800	IN	AAAA	2001:500:2f::f

root-servers.net.	172800	IN	NS	a.root-servers.net.
root-servers.net.	172800	IN	NS	f.root-servers.net.
root-servers.net.	172800	IN	NS	j.root-servers.net.
root-servers.net.	172800	IN	NS	k.root-servers.net.

a.root-servers.net.	172800	IN	A
a.root-servers.net.	172800	IN	AAAA	2001:503:ba3e::2:30
f.root-servers.net.	172800	IN	A
f.root-servers.net.	172800	IN	AAAA	2001:500:2f::f
j.root-servers.net.	172800	IN	A
j.root-servers.net.	172800	IN	AAAA	2001:503:c27::2:30
k.root-servers.net.	172800	IN	A
k.root-servers.net.	172800	IN	AAAA	2001:7fd::1

;; Query time: 101 msec
;; WHEN: Fri Feb  8 09:20:52 2008
;; MSG SIZE  rcvd: 302



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