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TD-W8968 300Mbps Wireless N USB ADSL2+ Modem Router User Guide
Figure 4-13
¾ Obtain an IP address automatically: Select this option, the modem router will be able to
obtain IP network information dynamically from a DHCP server provided by your ISP.
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Note:
1) The response message from a DHCP server typically contains a number of configuration
parameters (DHCP options) for the modem router. The DHCP options include IP network
information, and also the vendor-specific options. In some cases, the modem router is
implemented to perform user-defined operations (as shown below). You can implement your
own treatment of all such options.
2) If the modem 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 Static 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.
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