Implementation Considerations

Some things to consider before implementing NAT include the following:

■ Translation introduces delays into the switching paths.

■ NAT makes some applications that use IP addresses difficult or impossible to use. For example, public web pages that have links expressed using local IP addresses rather than DNS names are not usable by outside hosts.

■ NAT hides the hosts' real identity.

■ All packets that need to be translated must go through the NAT router, which might place limitations on the network design.

NOTE Further information on NAT and PAT is available from the Network Address Translation (NAT) Introduction page at tsd_technology_support_sub-protocol_home.html.

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