TRENDnet TDM-C400, User Manual, Page: 100 / 205

TDM-E400 / TDM-C400 ADSL2+ Ethernet Modem Router User’s Manual
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Configuring DHCP Relay
Some ISPs perform the DHCP server function for their customers’
home/small office networks. In this case, you can configure the
device as a DHCP relay agent. When a computer on your network
requests Internet access, the Ethernet Modem Router contacts your
ISP to obtain an IP address (and other information), and then
forwards that information to the computer. Follow these instructions
to configure DHCP relay:
First, you must configure your PCs to accept DHCP information
assigned by a DHCP server:
1. Open the Windows Control Panel and display the computer's
Networking properties. Configure the TCP/IP properties to
"Obtain an IP address automatically" (the actual text may
vary depending on your operating system). For detailed
instructions, see “Quick Start Part 2 — Configuring Your
Computers,” for instructions.
Next, you specify the IP address of the DHCP server and select the
interfaces on your network that will be using the relay service.
2. Log into the Web Configuration, click the LAN tab, and then
click
DHCP Relay
in the task bar.
The DHCP Relay Configuration page displays:
Figure 38. DHCP Relay Configuration Page
3. In the DHCP Server Address fields, type the IP address of
your ISP’s DHCP server.
If you do not have this address, it is not essential to enter it
here. Requests for IP information from your LAN will be passed
to the default gateway, which should route the request
appropriately.
4. Select the device’s WAN interface from the drop-down list
and click .
The WAN interface may be named ppp-0, eoa-0, or ipoa-0.
Contact your ISP if you are unsure which type to use.
(Note that you can also delete an interface from the table by
clicking
in the right column.)