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LAN Settings
The US Robotics ADSL Ethernet Modem has an integrated network
processor, which means it supports network features such as routing,
NAPT, DHCP, and DNS services. When configuring the modem for
routing, the following settings may need to be configured: Management
IP, NAPT, DHCP/DNS, and Routing Table. To access these settings,
click LAN Settings. These options will be shown at the bottom of the
Setup Menu. The configuration steps for these options are below.
Management IP
The Management IP address is the address of the inside Local Area
Network (LAN). This is a private address that is only accessible to the
computers that are connected to the US Robotics ADSL Ethernet
Modem. When packets are sent outside the network of the US Robotics
ADSL Ethernet Modem, the IP address gets converted to a globally
accessible IP address, or a WAN IP. The Subnet Mask is applied to an
IP address in order to mask a portion of the address. This will distinguish
the network ID from the host ID.
To access the Management IP address configuration, click LAN
Settings and then click Management IP. To change the Management IP
Address and the Subnet Mask, enter the values that were provided by
your service provider and click OK. The default IP address is
192.168.1.1 and the default subnet mask is 255.255.255.0. Usually these
settings will not need to be changed.
Configuring NAPT
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The NAPT feature converts IP addresses on a private network
(designated as inside or LAN) to global IP addresses that can forward
packets to another registered network (designated as "outside" or
"WAN"). It enables multiple PCs on the LAN to access the Internet for the
cost of one IP address. NAPT is a special case of NAT, where many IP
numbers are hidden behind a number of addresses. In contrast to the
original NAT, the number of connections is not limited to that number.
With NAPT, an almost arbitrary number of connections is multiplexed
using TCP port information. Enabling the NAPT inbound server will allow
WAN devices to access your LAN.
To set up the NAPT feature, you must select the appropriate Interface.
You must then select the Port number, Protocol (UDPor TCP), and the
Server IP Address for each port that you want to enable. Click OK to
save the settings.
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