SIEMENS 5890 DSL Router
User’s Guide
Chapter 6 Security Setup
NAT
SIEMENS
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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.
Besides translating addresses, NAT also authenticates a request or matches it to a previous request.
Network administrators create a NAT table that does the global-to-local and local-to-global IP address
mapping. To confiugre NAT:
1. Click
NAT
on the left navigation pane of the Router Information page. This displays the NAT Configuration
page.
2. 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.
3. 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).
4. Click
Apply
.
5. Do both of the following:
•
Configure the WAN side for NAT support by clicking
NAT Server
from the left navigation pane.
•
Configure the Local Machine for NAT support by clicking
NAT Host Mapping
from the left navigation
pane.
