Edimax Technology 3G-6218n - Manual (Page 96)

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3-6 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.