Siemens se5880 User Manual

Page 55

SIEMENS se5880 Ethernet Security Router
User’s Guide

Chapter 6 Security Setup

NAT

SIEMENS

NAT

Network Address Translation (NAT) provides a level of security by hiding the private IP addresses of your LAN
behind the single public IP address of your router. All connections pass through the router and are translated
by NAT. Network addresses on inbound traffic are translated from public to private IP addresses; while
addresses on outbound traffic are translated from private IP addresses to the router’s public IP address.

1. To configure NAT, click NAT on the left navigation pane of the Router Information page. This displays the

NAT Settings page. (You can also view the current inbound NAT settings for each protocol in the Current
Inbound NAT Setting table.)

2. In the Outbound NAT Setting section of this page, select Enable or Disable to enable or disable NAT for

communications from your LAN to the Wide Area Network (WAN).

3. Click Apply.

4. In the NAT Passthrough section of this page, select Enable or Disable to specify whether or not multiple

VPN clients are allowed. Enabled, multiple VPN clients are allowed; disabled, only a single VPN client is
allowed.

5. Click Apply.

6. On the Wan side of the Inbound NAT Setting section on this page, do one of the following:

•

Select the network service you are configuring from the Service drop-down menu for Easy Setup. This
configures NAT to support the most common network services.

•

For Advanced Setup, select a protocol from the Protocol drop-down menu and specify a First Port # to
assign a port number for the protocol to use. To assign a range of port numbers, specify a Last Port #
as well.

7. On the Local Machine side of the Inbound NAT Setting section on this page, enter the IP address of the

local machine in IP Address.

8. Do one of the following to enter port Information for the selected service:

•

Click Add next to Default Port # to use the default port for the specified service.

•

Enter the port number on the local machine you want the specified service to use in Port #, and click
Add. Leave this field blank if you want the local machine to use the same port number as the WAN.

9. Click Reboot.