WESM zl Management and Configuration Guide WT.01.XX and greater

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Configuring Network Address Translation (NAT)
Overview
The Wireless Edge Services zl Module would then translate the destination IP
addresses of all traffic destined to port 80 to the Web server’s private IP
address (the address on wired network). Likewise, the module would translate
all traffic destined to port 21 to the FTP server’s private IP address.
Figure 8-5. Outside Destination NAT with Port Forwarding