I have a local network. On my server the o/s is windows2000 server installed. But on my one node red hat linux 6.2 installed. How i can configure network and communicate both machine or o/s.

If you can help me then please help me.

1. Plug them into the same network ;)
2. Allocate linux box an IP address on the Win2K network
3. You can either: create a /etc/hosts entry to reference the Win box by name and add an entry to Win2K host file or add the Linux box to a common DNS server.
4. This will allow each machine to ping eachother, ftp and do internet type stuff between them.
5. If you want to share file systems between them, use something like samba.

There is a lot to the question you are asking. You will need to set up IP addresses and a netmask on both computers and connect them using a crossover network cable or use straight connections to a hub.

To share files between the Windows and Linux computers, you will need to run Samba on the Linux computer.

The following link may be helpful:
http://ctdp.tripod.com/os/linux/usersguide/index.html
See item 31 (use netconf to set the linux network up) and item 38, Samba.