nslookup

I am running windows 2003 domain name/ip (baba-e-urdu )(172.16.0.3)
controller and also having dns server on it.
i am having isa server 2004 on another computer 172.16.0.1
when i use to run nslookuo on client machine it gives following error


C:\Documents and Settings\raf>nslookup
Default Server: baba-e-urdu.fuuast.edu
Address: 172.16.0.3

> yahoo.com
Server: baba-e-urdu.fuuast.edu
Address: 172.16.0.3

DNS request timed out.
timeout was 2 seconds.
*** Request to baba-e-urdu.fuuast.edu timed-o
>


kindly help me out to setup forwarder