Troubleshooting slow DNS lookup
Rianto Wahyudi
me at rwahyudi.com
Fri Nov 26 01:48:32 UTC 2010
Hi all,
Im trying to troubleshoot and find out the reason why some of our DNS lookup
take a long time :
ns-dev ~ # rndc flushname www.paypal.com ; dig www.paypal.com @localhost
; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_4.2 <<>> www.paypal.com @localhost
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29297
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 3, ADDITIONAL: 2
;; QUESTION SECTION:
;www.paypal.com. IN A
;; ANSWER SECTION:
www.paypal.com. 300 IN A 64.4.241.33
www.paypal.com. 300 IN A 64.4.241.49
www.paypal.com. 300 IN A 66.211.169.2
www.paypal.com. 300 IN A 66.211.169.65
;; AUTHORITY SECTION:
paypal.com. 252 IN NS ns2.isc-sns.com.
paypal.com. 252 IN NS ns3.isc-sns.info.
paypal.com. 252 IN NS ns1.isc-sns.net.
;; ADDITIONAL SECTION:
ns3.isc-sns.info. 3559 IN A 63.243.194.1
ns3.isc-sns.info. 86352 IN AAAA 2001:5a0:10::1
;; Query time: 5119 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Fri Nov 26 12:05:49 2010
;; MSG SIZE rcvd: 225
Doing trace :
; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_4.2 <<>> www.paypal.com @localhost
+trace
;; global options: printcmd
. 516870 IN NS i.root-servers.net.
. 516870 IN NS j.root-servers.net.
. 516870 IN NS k.root-servers.net.
. 516870 IN NS l.root-servers.net.
. 516870 IN NS m.root-servers.net.
. 516870 IN NS a.root-servers.net.
. 516870 IN NS b.root-servers.net.
. 516870 IN NS c.root-servers.net.
. 516870 IN NS d.root-servers.net.
. 516870 IN NS e.root-servers.net.
. 516870 IN NS f.root-servers.net.
. 516870 IN NS g.root-servers.net.
. 516870 IN NS h.root-servers.net.
;; Received 492 bytes from 127.0.0.1#53(127.0.0.1) in 2 ms
com. 172800 IN NS b.gtld-servers.net.
com. 172800 IN NS h.gtld-servers.net.
com. 172800 IN NS f.gtld-servers.net.
com. 172800 IN NS m.gtld-servers.net.
com. 172800 IN NS c.gtld-servers.net.
com. 172800 IN NS e.gtld-servers.net.
com. 172800 IN NS d.gtld-servers.net.
com. 172800 IN NS a.gtld-servers.net.
com. 172800 IN NS g.gtld-servers.net.
com. 172800 IN NS l.gtld-servers.net.
com. 172800 IN NS j.gtld-servers.net.
com. 172800 IN NS i.gtld-servers.net.
com. 172800 IN NS k.gtld-servers.net.
;; Received 504 bytes from 192.36.148.17#53(i.root-servers.net) in 57 ms
paypal.com. 172800 IN NS ns1.isc-sns.net.
paypal.com. 172800 IN NS ns2.isc-sns.com.
paypal.com. 172800 IN NS ns3.isc-sns.info.
;; Received 177 bytes from 192.33.14.30#53(b.gtld-servers.net) in 5498 ms
www.paypal.com. 300 IN A 66.211.169.65
www.paypal.com. 300 IN A 64.4.241.33
www.paypal.com. 300 IN A 64.4.241.49
www.paypal.com. 300 IN A 66.211.169.2
paypal.com. 300 IN NS ns3.isc-sns.info.
paypal.com. 300 IN NS ns1.isc-sns.net.
paypal.com. 300 IN NS ns2.isc-sns.com.
;; Received 285 bytes from 72.52.71.1#53(ns1.isc-sns.net) in 174 ms
Version of bind installed : bind-9.3.6-4.P1.el5_4.2
IPv6 has been disabled on the host and firewall turned off during the test.
Any toughts ?
Regards,
Rianto
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.isc.org/pipermail/bind-users/attachments/20101126/129aca13/attachment.html>
More information about the bind-users
mailing list