Compression / Pointers on returned queries
Dawn Connelly
dawn.connelly at gmail.com
Thu Jun 5 18:59:38 UTC 2008
Whatever Cisco is doing is totally up to them. They aren't using BIND but
their own bastardized version of it...which is typical Cisco style.
http://www.cisco.com/en/US/products/sw/netmgtsw/ps1982/products_qanda_item09186a0080094b10.shtml#qa2
You'll need to open a case with Cisco to find out.
On Wed, Jun 4, 2008 at 5:43 PM, Brian Feeny <bfeeny at ctiusa.com> wrote:
> I am trying to query a Cisco CNR, which I was told by someone is BIND
> based. I am not sure, but thought I would mention this up front.
>
>
> When I query nameserver, I get back a reply that is sometimes 583 bytes,
> and sometimes its 457 bytes. The times its 457 bytes its using
> compression/pointers.
>
> What I am confused about is 1) Why does it sometimes use compression
> (about 1 out of 10 times) yet most of the time does not use compression,
> 2) Is there a way to force the compression?
>
>
>
>
>
> Here it is without compression:
>
>
>
> [signal at server signal]$ dig @69.42.101.232 images.tigerdirect.com
>
>
>
> ; <<>> DiG 9.2.4 <<>> @69.42.101.232 images.tigerdirect.com
>
> ; (1 server found)
>
> ;; global options: printcmd
>
> ;; Got answer:
>
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 49262
>
> ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 9, ADDITIONAL: 9
>
>
>
> ;; QUESTION SECTION:
>
> ;images.tigerdirect.com. IN A
>
>
>
> ;; ANSWER SECTION:
>
> images.tigerdirect.com. 600 IN CNAME
> images.tigerdirect.com.edgesuite.net.
>
> images.tigerdirect.com.edgesuite.net. 16525 IN CNAME a1125.g.akamai.net.
>
> a1125.g.akamai.net. 19 IN A 72.246.25.11
>
> a1125.g.akamai.net. 19 IN A 72.246.25.17
>
>
>
> ;; AUTHORITY SECTION:
>
> g.akamai.net. 1234 IN NS n1g.akamai.net.
>
> g.akamai.net. 1234 IN NS n4g.akamai.net.
>
> g.akamai.net. 1234 IN NS n0g.akamai.net.
>
> g.akamai.net. 1234 IN NS n8g.akamai.net.
>
> g.akamai.net. 1234 IN NS n7g.akamai.net.
>
> g.akamai.net. 1234 IN NS n6g.akamai.net.
>
> g.akamai.net. 1234 IN NS n5g.akamai.net.
>
> g.akamai.net. 1234 IN NS n2g.akamai.net.
>
> g.akamai.net. 1234 IN NS n3g.akamai.net.
>
>
>
> ;; ADDITIONAL SECTION:
>
> n1g.akamai.net. 2134 IN A 72.246.25.37
>
> n4g.akamai.net. 2134 IN A 8.14.56.44
>
> n0g.akamai.net. 1234 IN A 69.26.165.28
>
> n8g.akamai.net. 3034 IN A 69.26.165.28
>
> n7g.akamai.net. 2134 IN A 8.14.56.52
>
> n6g.akamai.net. 1234 IN A 8.14.56.23
>
> n5g.akamai.net. 3034 IN A 8.14.56.37
>
> n2g.akamai.net. 3034 IN A 8.14.56.4
>
> n3g.akamai.net. 1234 IN A 8.14.56.15
>
>
>
> ;; Query time: 175 msec
>
> ;; SERVER: 69.42.101.232#53(69.42.101.232)<http://69.42.101.232#53%2869.42.101.232%29>
>
> ;; WHEN: Tue Jun 3 20:30:09 2008
>
> ;; MSG SIZE rcvd: 583
>
>
>
>
>
> And here it is without compression:
>
>
>
> [signal at server signal]$ dig @69.42.101.232 images.tigerdirect.com
>
>
>
> ; <<>> DiG 9.2.4 <<>> @69.42.101.232 images.tigerdirect.com
>
> ; (1 server found)
>
> ;; global options: printcmd
>
> ;; Got answer:
>
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 31016
>
> ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 9, ADDITIONAL: 9
>
>
>
> ;; QUESTION SECTION:
>
> ;images.tigerdirect.com. IN A
>
>
>
> ;; ANSWER SECTION:
>
> images.tigerdirect.com. 600 IN CNAME
> images.tigerdirect.com.edgesuite.net.
>
> images.tigerdirect.com.edgesuite.net. 16559 IN CNAME a1125.g.akamai.net.
>
> a1125.g.akamai.net. 20 IN A 72.246.25.17
>
> a1125.g.akamai.net. 20 IN A 72.246.25.11
>
>
>
> ;; AUTHORITY SECTION:
>
> g.akamai.net. 1268 IN NS n2g.akamai.net.
>
> g.akamai.net. 1268 IN NS n3g.akamai.net.
>
> g.akamai.net. 1268 IN NS n1g.akamai.net.
>
> g.akamai.net. 1268 IN NS n4g.akamai.net.
>
> g.akamai.net. 1268 IN NS n0g.akamai.net.
>
> g.akamai.net. 1268 IN NS n8g.akamai.net.
>
> g.akamai.net. 1268 IN NS n7g.akamai.net.
>
> g.akamai.net. 1268 IN NS n6g.akamai.net.
>
> g.akamai.net. 1268 IN NS n5g.akamai.net.
>
>
>
> ;; ADDITIONAL SECTION:
>
> n2g.akamai.net. 3068 IN A 8.14.56.4
>
> n3g.akamai.net. 1268 IN A 8.14.56.15
>
> n1g.akamai.net. 2168 IN A 72.246.25.37
>
> n4g.akamai.net. 2168 IN A 8.14.56.44
>
> n0g.akamai.net. 1268 IN A 69.26.165.28
>
> n8g.akamai.net. 3068 IN A 69.26.165.28
>
> n7g.akamai.net. 2168 IN A 8.14.56.52
>
> n6g.akamai.net. 1268 IN A 8.14.56.23
>
> n5g.akamai.net. 3068 IN A 8.14.56.37
>
>
>
> ;; Query time: 168 msec
>
> ;; SERVER: 69.42.101.232#53(69.42.101.232)<http://69.42.101.232#53%2869.42.101.232%29>
>
> ;; WHEN: Tue Jun 3 20:29:34 2008
>
> ;; MSG SIZE rcvd: 457
>
>
>
>
>
>
>
> --------------------------------------
>
> Brian Feeny, CCIE #8036, CISSP
>
> Engineering Manager
>
> Coleman Technologies, Inc.
>
> 561-214-2470 cell
>
> 407-455-5404 fax
>
>
>
>
>
>
>
>
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