How do I configure DNS in a child domain?

How I can configure DNS in a child domain? My domain is nwtraders.msft (server name: London) and my child domain is asia1.nwtraders.msft (server name: Bangalore). I did the following steps:

1. I installed two Windows 2000 Advanced Servers and set the namespaces.
   
2. I installed DNS on London and created forward lookup zone nwtraders.msft and reverse lookup zone 1.168.192. Both zones are configured for dynamic updates.
   
3. I created a new delegation for asia1.nwtraders.msft. I typed the server name and clicked resolve. I got an error message saying: "There is no NS record for the server." I entered the IP address 192.168.1.4 and finished the delegation.
   
4. I did the same for reverse lookup zone.
   
5. I changed the primary DNS server address of Banglore to local address 192.168.1.4.
   
6. I installed DNS on Bangalore and created forward lookup zone asia1.nwtraders.msft and secondary reverse lookup zone for nwtraders.msft.
   
7. I ran dcpromo.exe and installed domain controller on London for the domain nwtraders.msft.
   
8. I ran dcpromo.exe and tried to install a child domain for nwtraders.msft, but it is giving me an error message saying it is not able to locate domain controller.

Please help me to solve this problem.