U.S. Robotics SureConnect ADSL Ethernet/USB Router User Guide
Network Address Translation (NAT) hides internal IP addresses of a network from the outside world and provides access to the Internet for multiple machines using a single or fixed number of public IP addresses. The NAT framework supports both dynamic and static NAT. The nat command enables dynamic NAT processing
With the nat command, all private addresses are mapped to the IP address of the specified WAN interface.
nat
- interface <interface>
Configures the specified WAN interface to use dynamic Network Address Translation. For all packets transmitted from the WAN interface, the source address is modified to use IP address of the WAN interface. The source port of the packet may be modified, as required. Packets received on the WAN interface will have their destination address modified appropriately to reach the appropriate machine on the LAN network.
-alias_address <ip_address>
The source address field of the outbound packets from the WAN interface will be overwritten with the specified ip_address.
-unregistered_only [yes no]
If yes, only the outbound packets with unregistered source IP addresses are translated. All the outbound packets with the registered source IP addresses are forwarded on the WAN interface without translation. This is useful if you have one more subnet having registered IP addresses that share the common WAN link with the subnet having unregistered IP addresses.
Registered addresses are addresses reachable and advertised in the Internet, whereas unregistered addresses are private addresses which are not reachable through the Internet. Currently there is no command to display registered addresses.
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