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
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