about the additional section
风河
shorttag at gmail.com
Fri Sep 2 03:45:49 UTC 2011
On Fri, Sep 2, 2011 at 11:36 AM, Mark Andrews <marka at isc.org> wrote:
> Named doesn't return records tagged as additional in the additional
> section. This stops the propogation of bogus records. Note there
> is no requirement for additional records to be added ever. Glue
> records are not additional records even though they are in the
> additional section.
>
Thank you Mark.
But why this named does returned additional section?
pyh at dwdns5:~$ dig txt chaos version.bind @119.147.163.133
; <<>> DiG 9.6.1-P2 <<>> txt chaos version.bind @119.147.163.133
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 40335
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0
;; WARNING: recursion requested but not available
;; QUESTION SECTION:
;version.bind. CH TXT
;; ANSWER SECTION:
version.bind. 0 CH TXT "9.6.1-P2"
;; AUTHORITY SECTION:
version.bind. 0 CH NS version.bind.
;; Query time: 0 msec
;; SERVER: 119.147.163.133#53(119.147.163.133)
;; WHEN: Fri Sep 2 11:44:03 2011
;; MSG SIZE rcvd: 65
pyh at dwdns5:~$ dig www.google.com @119.147.163.133
; <<>> DiG 9.6.1-P2 <<>> www.google.com @119.147.163.133
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2183
;; flags: qr rd ra; QUERY: 1, ANSWER: 7, AUTHORITY: 4, ADDITIONAL: 1
;; QUESTION SECTION:
;www.google.com. IN A
;; ANSWER SECTION:
www.google.com. 515063 IN CNAME www.l.google.com.
www.l.google.com. 300 IN A 74.125.71.105
www.l.google.com. 300 IN A 74.125.71.106
www.l.google.com. 300 IN A 74.125.71.147
www.l.google.com. 300 IN A 74.125.71.99
www.l.google.com. 300 IN A 74.125.71.103
www.l.google.com. 300 IN A 74.125.71.104
;; AUTHORITY SECTION:
google.com. 83063 IN NS ns3.google.com.
google.com. 83063 IN NS ns4.google.com.
google.com. 83063 IN NS ns1.google.com.
google.com. 83063 IN NS ns2.google.com.
;; ADDITIONAL SECTION:
ns1.google.com. 255954 IN A 216.239.32.10
;; Query time: 60 msec
;; SERVER: 119.147.163.133#53(119.147.163.133)
;; WHEN: Fri Sep 2 11:44:13 2011
;; MSG SIZE rcvd: 236
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