topic Re: how to use nslookup to search 2nd DNS server in Operating System - HP-UX

how to use nslookup to search 2nd DNS server

Hanry Zhou — Tue, 21 Jul 2009 14:37:11 GMT

I am trying to resolve a hostname, but it is existed on on 2nd DNS server, not the on the default one. without changing /etc/resolv.conf, how to search different DNS server within nslookup?

Thanks,

Re: how to use nslookup to search 2nd DNS server

Pete Randall — Tue, 21 Jul 2009 14:40:38 GMT

According to the man page, you can specify the server:

nslookup [-option ...] host-to-find [server]

Pete

Re: how to use nslookup to search 2nd DNS server

Vinod Kumar Yadav — Tue, 21 Jul 2009 17:39:30 GMT

Hi,

Frist check with resolv.conf then u got the dns entery in the that file.

Use the following step to resolve.

root # nslookup 135.37.9.18
Using /etc/hosts on: ts330

looking up FILES
Name: gab200dns.qip.hp.com
Address: 135.37.9.18

ah330 root # nslookup gab200dns.qip.hp.com
Using /etc/hosts on: ts330

looking up FILES
Name: gab200dns.qip.hp.com
Address: 135.37.9.18

ah330 root # nslookup 135.38.244.3
Using /etc/hosts on: ts330

looking up FILES
Trying DNS
Name: mo3980dns.qip.hp.com
Address: 135.38.244.3

Then u got the primay DNS & seconday DNS.

Thanks

Re: how to use nslookup to search 2nd DNS server

Pete Randall — Tue, 21 Jul 2009 17:51:03 GMT

Every one of those nslookups returns the fact that it is using /etc/hosts and not a dns server at all. To use a specific dns server, specify it in the nslookup command as I originally said.

# cat /etc/resolv.conf
domain holstein.com
nameserver 140.1.0.240
nameserver 140.1.0.239
# nslookup hp.com 140.1.0.240
Name Server: nsa.holstien.com
Address: 140.1.0.240

Trying DNS
Non-authoritative answer:
Name: hp.com
Addresses: 15.192.45.138, 15.192.45.139, 15.200.2.21, 15.200.30.21
15.200.30.22, 15.200.30.23, 15.200.30.24, 15.216.110.21, 15.216.110.22

15.216.110.139, 15.216.110.140, 15.192.45.21, 15.192.45.22

# nslookup hp.com 140.1.0.239
Name Server: nsb.holstien.com
Address: 140.1.0.239

Trying DNS
Non-authoritative answer:
Name: hp.com
Addresses: 15.216.110.139, 15.216.110.140, 15.192.45.21, 15.192.45.22
15.192.45.138, 15.192.45.139, 15.200.2.21, 15.200.30.21, 15.200.30.22
15.200.30.23, 15.200.30.24, 15.216.110.21, 15.216.110.22

#

Pete

Re: how to use nslookup to search 2nd DNS server

Pete Randall — Tue, 21 Jul 2009 17:53:04 GMT

Pete

> Every one of those nslookups returns the fact that it is using /etc/hosts and not a dns server at all.

Not true. The third one looks to DNS, but I'm still confused by what is being attempted.

Pete

Re: how to use nslookup to search 2nd DNS server

Andrew C Fieldsend — Wed, 22 Jul 2009 09:51:07 GMT

I usually force the server by using nslookup's command line:

# nslookup
> server
>

I'm curious why the hostname doesn't exist on both servers? DNS was designed as a distributed, resilient name service, and assumes that everything is the same whichever server you use (excluding zone propagation delays).

Re: how to use nslookup to search 2nd DNS server

Suraj K Sankari — Wed, 22 Jul 2009 09:58:39 GMT

Hi,
See the example

User: nslookup toolah.fourex.oz wurrup.fourex.oz
System: Server: wurrup
Address: 101.3.104.12

Name: toolah.fourex.oz
Address: 101.3.100.2

If you want to know more about nslookup see the below link.

http://publib.boulder.ibm.com/infocenter/zos/v1r9/index.jsp?topic=/com.ibm.zos.r9.halu101/f1a1c260347.htm

Suraj

Re: how to use nslookup to search 2nd DNS server

Duncan Edmonstone — Wed, 22 Jul 2009 10:02:51 GMT

feeling a little schizophrenic today Pete? Talking to yourself isn't generally a good sign... ;o)

Duncan