NAT allows all of the hosts inside of your local LAN (off of the Ethernet) to appear to the outside world as if they had the same IP address as the Serial Interface. Some implementations of NAT refer to this as the Inside Global Address. NAT can be applied to multiple Serial Interfaces.
To allow access to specific servers inside of your LAN, you need to explicitly identify which servers can be accessed. This is done by Creating Public Server Lists. If no servers (and their address/port combinations) are specified, then any connection attempts from the external network to an internal host will be rejected.
Benefits of using NAT:
Saves IP Address space
Only need to change the IP Address of the Serial Interface if you change ISPs
Only one host address is visible to the outside world (helps with security issues)
To enable NAT on this Serial Interface, check the Enable Network Address Translation box:
Next: Adding Tunnels for VPN Support
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