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MCSE : Security Specialist

Network Address Translators (NATs)

 

Private addresses cannot receive traffic from Internet locations. Therefore, to enable a network, which uses private addresses internally, to communicate with Internet locations, you must use a network address translator (NAT). The NAT is a device, or service, that translates private IP addresses to public IP addresses. Network address translation is an Internet standard that enables a public intranet to use a set of private IP addresses for internal traffic and to connect to a computer that uses a public IP address for external traffic.

 

 

How Does a NAT Work?

The NAT is a router that is placed between a public intranet, which uses private IP addresses, and the Internet, which uses public IP addresses. The NAT translates the private IP addresses of outgoing packets into public IP addresses. It also translates the public IP addresses of incoming packets from the Internet into private IP addresses.  NATs serve two main purposes:

 

  • Increase security by hiding internal IP addresses
  • Enable an organization to require fewer public IP addresses

 

Windows 2003 NAT Services

Microsoft Windows 2003 includes NAT services that enable you to configure your home network or small office network to share a single connection to the Internet.

 


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