User guide

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NAT
Network Address Translation allows multiple users to access the
Internet, while sharing only one public IP.
Address Mapping
Allows one or more public IP addresses to be shared by multiple
internal users. This also hides the internal network for increased
privacy and security. Enter the Public IP address that you wish to
share into the Global IP field. In the from field, enter a range of
internal IPs that will share the global IP.