When your operating system is Windows 2000 and you connect to a DNS server, Network and Dial-up Connections attemps to register a Dynamic Domain Name System (DDNS) "A" record.
When you are connected to your ISP or to any DNS server that does not support DDNS, like windows NT, you should disable this feature to avoid unnecessary traffic:
1. Right-click My Network Places and choose Properties.
2. Right-click the connection and choose Properties.
3. Select Internet Protocol (TCP/IP) and press Properties.
4. Press Advanced and select the DNS tab.
5. Uncheck the Register this connection's address in DNS box.
6. Press OK, OK, and OK.
NOTE: This disables the DHCP client from registering with DNS. It has no effect on static addresses.