Wireless/Redundant Edge Services xl Module Management and Configuration Guide WS.02.xx and greater

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Configuring Network Address Translation (NAT)
Overview
Figure 8-2 illustrates this configuration, which allows wireless stations to use
IP addresses local to the wireless network but still to open sessions with
servers in the Ethernet network.
Figure 8-2. Dynamic Source NAT on Wireless Traffic
You can also implement NAT on the module to ready wireless traffic for
transmission to the Internet—if you do not have another device that does so.
Many companies have only one public IP address although they have many
employees who need Internet access. With dynamic NAT, all these employees
can share one IP address. When users on the company’s wireless network send
requests to the Internet, the Wireless Edge Services xl Module translates the
senders’ local IP addresses to a global address—the module’s IP address in
the wired network. After translating packets’ source IP addresses, the module
forwards the requests onto the Ethernet network and toward the Internet.
Dynamic NAT for Wired Traffic
You can configure dynamic NAT for traffic bound from the wired network to
the wireless network. In this case, the Wireless Edge Services xl Module
translates wired devices’ IP addresses to one of the module’s own IP
addresses.