User's Manual

Configuring Network Address Translation
308625-14.00 Rev 00
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How NAT Works
In the example that follows, company A uses NAT to obtain global Internet access
for its hosts. Hosts on company A’s network need access to resources in company
B’s network. Company B is located in a different network on the Internet. Its
addresses are registered. NAT is configured on the router bordering company A’s
network and the global network. NAT enables communication between the
networks of company A and company B without requiring either company to
restructure its existing network.
The network administrator at company A configures NAT to detect the following
ranges of unregistered local addresses:
• 10.0.0.0 through 10.255.255.255
• 15.0.0.0 through 15.255.255.255
• 50.1.1.0 through 50.1.1.255
The network administrator also configures the following ranges of registered
global addresses:
• 192.55.10.0 through 192.55.10.255
• 192.20.10.0 through 192.20.10.255