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5.2.1 Configuring Network Address Translation (NAT) Settings
Network Address Translation (NAT) converts an IP address in one network to a different IP address or
set of IP addresses in another network. The AP-5131 router maps its local (inside) network addresses
to WAN (outside) IP addresses, and translates the WAN IP addresses on incoming packets to local IP
addresses. NAT is useful because it allows the authentication of incoming and outgoing requests, and
minimizes the number of WAN IP addresses needed when a range of local IP addresses is mapped to
each WAN IP address. NAT can be applied in one of two ways:
• One-to-one mapping with a private side IP address
The private side IP address can belong to any of the private side subnets.
• One-to-many mapping with a configurable range of private side IP addresses
Ranges can be specified from each of the private side subnets.
Use the NAT screen to configure IP address mappings. To configure IP address mappings for the
AP-5131:
1. Select Network Configuration -> WAN -> NAT from the AP-5131 menu tree.