[dns-operations] ANY request

Phil Regnauld regnauld at nsrc.org
Sun Feb 7 09:40:48 UTC 2010

Fabien CHABANNE (chabanne) writes:
> I tested the ANY request

	Hi Fabien,

	Could you detail how you have queries the nameservers ?

	Did you use dig ?

	i.e.: dig +norec @ns1.google.com google.com any 

	Or was it via an API (Ruby, Perl, C, ...)

	Also, the output, especially the flags (flags: qr aa rd;) would be useful.

	See my example output below.

> on some nameservers of google
> (ns1.google.com., ns2.google.com., ...) and I see that they do not
> always reply by a full response and they do not set the Truncated bit.
> For exemple they do not always return the SOA record and all of the NS
> records but a part of it. So I was wondering if this way of answering
> to an ANY query was correct and how can we have the entire response ? 

	I will let more knowledgeable people on this list answer, but
	for one thing I don't what nameserver implementation Google
	is using for their authoritative servers.  Also, answers to ANY
	are somewhat implementation dependent, for example:


Sample output -- SOA is always returned in my case.

; <<>> DiG 9.6.0-APPLE-P2 <<>> +norec @ns1.google.com google.com any
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 44792
;; flags: qr aa rd; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;google.com.			IN	ANY

google.com.		300	IN	A
google.com.		300	IN	A
google.com.		300	IN	A
google.com.		3600	IN	TXT	"v=spf1 include:_netblocks.google.com ip4: ip4: ~all"
google.com.		345600	IN	NS	ns2.google.com.
google.com.		900	IN	MX	200 google.com.s9a2.psmtp.com.
google.com.		900	IN	MX	300 google.com.s9b1.psmtp.com.
google.com.		345600	IN	NS	ns4.google.com.
google.com.		345600	IN	NS	ns3.google.com.
google.com.		86400	IN	SOA	ns1.google.com. dns-admin.google.com. 1406150 7200 1800 1209600 300
google.com.		900	IN	MX	400 google.com.s9b2.psmtp.com.
google.com.		345600	IN	NS	ns1.google.com.
google.com.		900	IN	MX	100 google.com.s9a1.psmtp.com.

;; Query time: 50 msec
;; WHEN: Sun Feb  7 10:39:40 2010
;; MSG SIZE  rcvd: 422

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