Edimax Technology 3G-6200nL - Manual (Page 105)

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3-5-2 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.
This broadband router supports four types of NAT functions, and the
instructions of these functions will be given below.