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address (each computer must have a unique address to distinguish it on the network). The IP address scheme
used in Example #1 can be used for any LAN that requires up to 253 separate IP addresses (excluding the
Modem). Notice that the subnet mask is the same for all machines and the default gateway address is the LAN IP
address of the Modem.
It is a good idea to make a note of each device's IP address for reference during troubleshooting or when adding
new stations or devices.
Using DHCP
The second way to use the default settings is to allow the Modem to automatically assign IP settings for
workstation using DHCP. To do this, simply make sure your computers' IP addresses are set to 0.0.0.0 (under
Windows, choose the option Obtain an IP address automatically in the TCP/IP network component described
above). When the computers are restarted, their IP settings will automatically be assigned by the Modem. The
Modem is set by default to use DHCP. See the discussion in Chapter 5 for information on how to use configure
the Modem for DHCP.
Changing the IP Address of the Modem
When planning your LAN IP address setup, you may use any scheme allowed by rules that govern IP assignment.
It may be more convenient or easier to remember an IP scheme that use a different address for the Modem. Or
you may be installing the Modem on a network that has already established the IP settings. Changing the IP
address is a simple matter and can be done using the web manager. If you are incorporating the Modem into a
LAN with an existing IP structure, be sure to disable the DHCP function.
An IP addressing scheme commonly used for Ethernet LANs establishes 10.0.0.1 as the base address for the
network. Using Example #2 below, the Modem is assigned the base address 10.0.0.1 and the remaining
addresses are assigned manually or using DHCP.
Host
Modem
Computer #1
Computer #2
Computer #3
These two examples are only examples you can use to help you get started. If you are interested in more
advanced information on how to use IP addressing on a LAN there are numerous resources freely available on
the Internet. There are also many books and chapters of books on the subject of IP address assignment, IP
networking and the TCP/IP protocol suite.
DSL-300T ADSL Modem User's Guide
Alternative IP Assignment
IP Address
10.0.0.1
10.0.0.2
10.0.0.3
10.0.0.4
IP Setup - Example #2
45
Subnet Mask
Gateway IP
255.255.255.0
255.255.255.0
10.0.0.1
255.255.255.0
10.0.0.1
255.255.255.0
10.0.0.1
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