SIEMENS 5930/5935 Business Gateway
User’s Guide
Chapter 6 Security Setup
NAT
SIEMENS
57
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
.