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nameserver

Reverse nslookup Command

How do I use nslookup command line administrative tool for testing and troubleshooting DNS servers including reverse lookup under UNIX or Windows operating systems? How do I look up an IP address of a domain or host on a network using nslookup command?
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I'm using GNU/Linux with the Internet Systems Consortium DHCP Client. The dhclient, provides a means for configuring one or more network interfaces using the Dynamic Host Configuration Protocol. It also updates my /etc/resolv.conf file each time my laptop connects to different network. I would like to keep my existing nameservers. How do I skip /etc/resolv.conf update on a Linux based system?
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Q. I've 3 corporate domains registered with Go Daddy. Recently we setup our own nameserver using BIND9 under Linux. My setup is as follows:
example.com domain
ns1.example.com 202.5.1.23
ns2.example.com 202.5.1.24
ns3.example.com 202.5.1.25

However, when I try to change nameserver using Go Daddy domain control panel, I get an error that read as follows:

Errors were detected.

How do I configure my server to avoid errors?
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