Edimax Technology AR-7266WNA - Manual (Page 81)

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5.2.6. NAT (
Network address translations
)
NAT (Network address translations) solve the problem if sharing a single IP
address to multiple computers. Without NAT, all computers must be assigned
with a valid Internet IP address to get connected to Internet, but Internet service
providers only provide very few IP addresses to every user. Therefore it’s
necessary to use NAT technology to share a single Internet IP address to
multiple computers on local network, so everyone can get connected to Internet.
Please follow the following instructions to set NAT parameters:
5.2.6.1. Port Forwarding
The Port Forwarding allows you to re-direct a particular range of service port
numbers (from the Internet) to a particular LAN IP address. It helps you to host
some servers behind the router NAT firewall.