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

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Configuring Network Address Translation (NAT)
Configuring NAT
4. Select either TCP or UDP in the Protocol drop-down menu.
This setting, which is available only for destination NAT, allows you to
configure port forwarding. Choose the protocol for the application for
which you are creating the NAT definition. For example, if you are setting
up destination NAT to allow wireless stations to reach your Web server,
select TCP.
5. In the Before Translation section, specify the IP address and port to the
traffic to be translated is destined.
a. In the Local Address field, enter the IP address to be translated.
This address depends on the choices that you made in the NAT section.
Refer to Table 8-5.
Table 8-7. Determining the IP Address for the Local Address Field
For destination NAT, the local address is actually the IP address of a
host as it appears to hosts in the opposite network. So if you are using
destination NAT to translate wireless requests to a wired server, enter
the address known in the wireless network (typically, the Wireless
Edge Services xl Module’s).
b. In the Local Port field, enter the port to which the traffic to be
translated is destined. Specify a number from 1 through 65,535.
This setting is used for port forwarding and is available only when you
select Destination for the Address Type . See “Using Port Forwarding
with Static Destination NAT” on page 8-10 for more information.
For example, you are setting up NAT for traffic inbound from a public
wireless network to your internal FTP server. This traffic from the
public network is destined to port 21, so you enter 21 in the Local Port
field.
6. In the After Translation section, specify how the Wireless Edge Services xl
Module should translate the IP header:
a. In the Global Address field, enter the IP address as it should appear
after translation. In other words, enter the actual IP address of the
server to which the traffic is destined.
Interface Type Address Type IP Address for the Local Address Field
Inside (Private) Destination IP address of an outside device as it appears on the
inside network
Outside (Public) Destination IP address of an inside device as it appears on the
outside network