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JSI Tip 4316. How do I configure the NAT service in Windows 2000?

The Windows 2000 Routing and Remote Access service includes a Network Address Translation (NAT) routing protocol. When the NAT protocol is installed and configured on the RRAS server, internal network clients with private IP addresses can access the Internet through the external interface of the NAT server.

When internal network clients send a request for the Internet, the NAT protocol driver intercepts the request and forwards the request to the destination Internet server. All requests appear to come from the external IP address of NAT server. This effectively hides your internal IP addresses scheme.

To configure the Windows 2000 RRAS NAT server:

  1. On the Administrative Tools menu, press Routing and Remote Access.

  2. In the Routing and Remote Access console, expand your server name and then expand the IP Routing node in the left pane of the console.

  3. Right-click the General node, and press New Routing Protocol.

  4. In the New Routing Protocol dialog box, select the Network Address Translation (NAT) protocol, and press OK.

  5. Right-click the Network Address Translation (NAT) node in the left pane, and press New Interface.

  6. Select the interface that represents your internal network interface, and press OK.

  7. In the Network Address Translation Properties dialog box, select the Private interface connected to private network option, and press OK.

  8. Right-click the Network Address Translation (NAT) no The Windows 2000 NAT server can automatically assign IP addresses to internal network clients. This is a viable option if you do not have a DHCP server already assigning addressing information to clients on the internal network.

Configure RRAS NAT Service To Assign IP Addresses And Perform Proxy DNS Queries

The NAT server can also perform DNS queries on the behalf of NAT clients. The RRAS NAT server resolves the Internet host name that is included in the client request and then forward the IP address to the client.

To configure the RRAS NAT service to assign IP addresses and perform proxy DNS queries on the behalf of internal network clients:
  1. Right-click the Network Address Translation (NAT) node in the left pane, and press Properties.

  2. In the Network Address Translation (NAT) Properties dialog box, select the Address Assignment tab. Select the Automatically assign IP addresses by using DHCP check box. You can type a network ID and subnet mask in the IP address and Mask boxes.

  3. Click the Name Resolution tab. Select the Clients using Domain Name System (DNS) check box. If you use a demand-dial interface to connect to the Internet, select the Connect to the public network when a name needs to be resolved check box. Select the interface to dial in the Demand-dial interface box.

  4. Press Apply and OK.

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