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WR1500 4-Port Wireless DSL/Cable Router
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Chapter 9:
Single User Account (SUA) /
Network Address Translation (NAT)
This chapter discusses how to confi gure SUA/NAT on the WR1500 Wireless Router.
9.1 NAT Overview
NAT (Network Address Translation - NAT, RFC 1631) is the translation of the IP address of
a host in a packet. For example, the source address of an outgoing packet, used within one
network is changed to a different IP address known within another network.
9.1.1 NAT Defi nitions
Inside/outside denotes where a host is located relative to the WR1500 Wireless Router For
example, the computers of your subscribers are the inside hosts, while the web servers on the
Internet are the outside hosts.
Global/local denotes the IP address of a host in a packet as the packet traverses a router. For
example, the local address refers to the IP address of a host when the packet is in the local
network, while the global address refers to the IP address of the host when the same packet is
traveling in the WAN side.
Note that inside/outside refers to the location of a host, while global/local refers to the IP
address of a host used in a packet. Thus, an inside local address (ILA) is the IP address of
an inside host in a packet when the packet is still in the local network, while an inside global
address (IGA) is the IP address of the same inside host when the packet is on the WAN side.
The following table summarizes this information.
TERM DESCRIPTION
Inside
This refers to the host on the LAN.
Outside
This refers to the host on the WAN.
Local
This refers to the packet address (source or destination) as the packet travels on the LAN.
Global
This refers to the packet address (source or destination) as the packet travels on the WAN.
NAT never changes the IP address (either local or global) of an outside host.