SMC Networks Barricade SMC2804WBR38 - Manual (Page 57)

Advanced Setup
47
Network Address Translation (NAT)
From this section you can configure the Address Mapping, Virtual
Server, and Special Application features that provide control over
the port openings in the router’s firewall. This section can be
used to support several Internet based applications such as VPN
Address Mapping
Allows one or more public IP addresses to be shared by multiple
internal users. Enter the Public IP address you wish to share into
the Global IP field. Enter a range of internal IPs that will share the
global IP.