User's Guide

Chapter 10 WAN
EMG3435-Q20A User’s Guide
88
Fig ure 58 Expert Mode > WAN > NAT > General
The following table describes the labels in this screen.
Table 22 Expert Mode > WAN > NAT > General
LABEL DESC RIPTIO N
General
Network Address
Translation (NAT)
Network Address Translation (NAT) allows the translation of an Internet protocol address used
within one network (for example a private IP address used in a local network) to a different IP
address known within another network (for example a public IP address used on the
Internet).
Select Ena ble to activate NAT. Select Disa ble to turn it off.
Default Server Setup
Default Server You can decide whether you want to use the default server or specify a server manually. In
addition to the servers for specified services, NAT supports a default server. A default server
receives packets from ports that are not specified in the port forwarding summary table
below.
Select this to use the default server.
Change To Server Select this and manually enter the server’s IP address.
Port Forwarding (Max Limit : 32)
# This is the number of an individual port forwarding server entry.
Name Select a pre-defined service from the drop-down list box. The pre-defined service port
number(s) and protocol will be displayed in the port forwarding summary table. Otherwise,
select Use r de fine to manually enter the port number/range and select the Pro to c ol.
Protocol Select the transport layer protocol supported by this virtual server. Choices are TC P, UDP, or
TC P_UDP.
If you have chosen a pre-defined service in the Na m e field, the protocol will be configured
automatically.
External Port This shows the port number(s) that identifies the service if you select a pre-defined service. If
you select Use r de fine in the Na m e field, enter the port number(s) manually.
Server IP Address Select Use r de fine to manually enter the inside IP address of the virtual server here.
Internal Port This shows the port number(s) that identifies the service if you select a pre-defined service. If
you select Use r de fine in the Na m e field, enter an internal port number manually or leave the
field blank for port range forwarding.