[Unbound-users] Question about qtype=any
W.C.A. Wijngaards
wouter at NLnetLabs.nl
Mon Jul 11 09:14:06 UTC 2011
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Hi,
Yes, unbound continues processing and follows the CNAME, also for qtype
ANY. It fetches the qtype ANY at the CNAME destination for the client.
Best regards,
Wouter
On 07/11/2011 02:59 AM, Luo Ce wrote:
> Not only www.google.com, I tried www.sohu.com <http://www.sohu.com> and
> www.yahoo.com <http://www.yahoo.com>, the results unbound gave me all
> include the A records.
>
> So the problem may not be the authoritative server, it looks like
> unbound continue to process the cname response and get the final A records.
>
>
>
> ; <<>> DiG 9.7.3-P1 <<>> @localhost www.sohu.com any
>
> ; (1 server found)
>
> ;; global options: +cmd
>
> ;; Got answer:
>
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55095
>
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 3, ADDITIONAL: 3
>
>
>
> ;; QUESTION SECTION:
>
> ;www.sohu.com. IN ANY
>
>
>
> ;; ANSWER SECTION:
>
> www.sohu.com. 600 IN CNAME d7.a.sohu.com.
>
> d7.a.sohu.com. 300 IN CNAME frontend-tc7.a.sohu.com.
>
> frontend-tc7.a.sohu.com. 300 IN A 61.135.181.169
>
> frontend-tc7.a.sohu.com. 300 IN A 61.135.181.171
>
> frontend-tc7.a.sohu.com. 300 IN A 61.135.181.167
>
>
>
> ;; AUTHORITY SECTION:
>
> a.sohu.com. 3600 IN NS y.a.sohu.com.
>
> a.sohu.com. 3600 IN NS x.a.sohu.com.
>
> a.sohu.com. 3600 IN NS z.a.sohu.com.
>
>
>
> ;; ADDITIONAL SECTION:
>
> x.a.sohu.com. 7200 IN A 121.14.0.42
>
> y.a.sohu.com. 7200 IN A 220.181.26.169
>
> z.a.sohu.com. 7200 IN A 61.135.179.168
>
>
>
> ; <<>> DiG 9.7.3-P1 <<>> @localhost www.yahoo.com any
>
> ; (1 server found)
>
> ;; global options: +cmd
>
> ;; Got answer:
>
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 24745
>
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 0
>
>
>
> ;; QUESTION SECTION:
>
> ;www.yahoo.com. IN ANY
>
>
>
> ;; ANSWER SECTION:
>
> www.yahoo.com. 300 IN CNAME fp.wg1.b.yahoo.com.
>
> fp.wg1.b.yahoo.com. 60 IN CNAME any-fp.wa1.b.yahoo.com.
>
> any-fp.wa1.b.yahoo.com. 60 IN A 98.137.149.56
>
> any-fp.wa1.b.yahoo.com. 60 IN A 72.30.2.43
>
>
>
> *From:*Blacka, David [mailto:davidb at verisign.com]
> *Sent:* Friday, July 08, 2011 8:25 PM
> *To:* Luo Ce
> *Cc:* <unbound-users at unbound.net>
> *Subject:* Re: [Unbound-users] Question about qtype=any
>
>
>
>
>
> On Jul 7, 2011, at 9:30 PM, Luo Ce wrote:
>
>
>
> Hi all,
>
>
>
> When I use unbound and send a query with qtype = any
>
> dig @localhost www.google.com <http://www.google.com> any
>
> unbound returns me the following results:
>
> ; (1 server found)
>
> ;; global options: +cmd
>
> ;; Got answer:
>
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 11161
>
> ;; flags: qr rd ra; QUERY: 1, ANSWER: 7, AUTHORITY: 0, ADDITIONAL: 0
>
>
>
> ;; QUESTION SECTION:
>
> ;www.google.com. IN ANY
>
>
>
> ;; ANSWER SECTION:
>
> www.google.com <http://www.google.com>. 604800 IN
> CNAME www.l.google.com <http://www.l.google.com>.
>
> www.l.google.com <http://www.l.google.com>. 300 IN
> A 74.125.71.147
>
> www.l.google.com <http://www.l.google.com>. 300 IN
> A 74.125.71.99
>
> www.l.google.com <http://www.l.google.com>. 300 IN
> A 74.125.71.106
>
> www.l.google.com <http://www.l.google.com>. 300 IN
> A 74.125.71.105
>
> www.l.google.com <http://www.l.google.com>. 300 IN
> A 74.125.71.103
>
> www.l.google.com <http://www.l.google.com>. 300 IN
> A 74.125.71.104
>
>
>
> I just want to know whether the A records are needed for the qtype any,
> cos when I send the same query to bind, it only returns me the cname answer.
>
>
>
> I believe what is happening here is that unbound is returning what the
> authoritative server returns for 'www.google.com/ANY', while BIND is
> reconstructing the answer (that is, looking at its cache and returning
> all RRsets that match the qname).
>
>
>
> So, maybe a better question is: why does google's authoritative
> nameservers return the A records with qtype=ANY?
>
>
>
> --
> David Blacka <davidb at verisign.com
> <mailto:davidb at verisign.com>>
> Principal Engineer Verisign Infrastructure Engineering
>
>
>
>
>
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> Unbound-users mailing list
> Unbound-users at unbound.net
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