Compression / Pointers on returned queries
Brian Feeny
bfeeny at ctiusa.com
Thu Jun 5 00:43:30 UTC 2008
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)
;; 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)
;; 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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