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TD-W8960N 300Mbps Wireless N ADSL2+ Modem Router User Guide
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Note:
1) The response message from a DHCP server typically contains a number of configuration
parameters (DHCP options) for the Router. The DHCP options include IP network information,
and also the vendor-specific options. In some cases, the Router is implemented to perform
user-defined operations (as shown below). You can implement your own treatment of all such
options.
2) If the Router is functioning as a DHCP client, it must identify itself in option 61 (client-identifier)
in every DHCP message. DUID/IAID is portion of option 61.
• Option 60 Vendor ID: The option code 60 used to identify Vendor class.
• Option 61 IAID: IAID (Identity Association ID) assigns an Identity Association ID to
individual interfaces. In cases where the device is functioning with a single DHCP client
identity, it must use value 1 for IAID for all DHCP interactions. In cases where the device
is functioning with multiple DHCP client identities, the values of IAID have to start at 1 for
the first identity and be incremented for each subsequent identity. For example, the
device may use IAID value 1 for the first physical interface and value 2 for the second.
Alternatively, the device may use IAID value 1 for the virtual circuit corresponding to the
first connection object in the data model and value 2 for the second connection object in
the data model.
• Option 61 DUID: Specifies the name of the interface whose link-layer address the server
is to use as its DUID (DHCP Unique Identifier). You must enter a value for this parameter
or the server will not start. When the server starts, the DUID is written to the system log.
• Option 125: The option 125 allows DHCP server to be pre-configured with policy for
handling classes of devices in a certain way without requiring DHCP server to be able to
parse the unique format used in client-identifier option.
¾ Use the following IP Address: If you are provided with a static IP/gateway Address, please
select this option, and then enter the WAN IP Address, WAN Subnet Mask and WAN
gateway IP Address manually.
5. You will see the next screen as below. You can enable the NAT, SPI Firewall, and IGMP
Multicast, if you are not sure about the settings, just leave the default settings. Click Next.
Figure 4-16
¾ Enable NAT: This technology translates the IP addresses of a local area network to a
different IP address for the Internet. If this Router is hosting your network’s connection to the
Internet, please select the check box. If another Router exists in your network, you don’t need
to select the option.