WESM zl Management and Configuration Guide WT.01.03 and greater

8-12
Configuring Network Address Translation (NAT)
Overview
When the module translates the destination IP address, it can also perform
port translation, assigning the traffic to the particular port used by the desti-
nation device.
Static NAT on Source Addresses
Static source NAT is an alternative to dynamic source NAT. However, instead
of allowing many stations to share one global address, static source NAT sets
up a one-to-one correspondence between a particular IP address and a trans-
lated IP address. Use this option only when relatively few devices in one
network (inside or outside) need to access devices in the other network.
Understanding Local and Global Addresses
When you configure NAT on the Wireless Edge Services zl Module, you define
a local address and a global address. As mentioned earlier, the local address
is the pre-translation address. For source NAT, the local address is always the
IP address assigned to the device for the network in which the device resides.
In Figure 8-6, the local address is any address used by a device in WLAN A—
the 10.1.1.0/24 subnetwork.