There are two basic ways to connect a network to the Internet: a routed connection , which uses a router and requires public IP addresses for each connected computer; or a translated connection , which uses a single computer to access the Internet with a public address and translates the data to allow use of private IP addresses elsewhere in the network. Network Address Translation (NAT) translates private IP addresses to public addresses, allowing a single computer to provide Internet access for a private network and eliminating the need for public addresses for all machines on the network. NAT actually provides three separate services to clients on a Windows 2000 network:
Translates between public and private IP addresses.
Includes a simple DHCP server and can assign IP addresses to clients. NAT uses the pools of private IP addresses listed earlier in this chapter.
Acts as a DNS server. Rather than maintaining a name and address database, the NAT server forwards DNS requests to an Internet DNS server and returns the results to its clients.
NAT is configured as a routing protocol and must be used on a Windows 2000 computer running Routing and Remote Access Services. To install NAT, follow these steps:
In the Routing and Remote Access console, open the Routing and Remote Access key in the left pane. Open the entry for the server, then select IP Routing.
Highlight the General entry. Right-click ...