TD-W8950N
150M bps Wireless N ADSL2+ M odem Router User Guide
22
Figure 4-15
Obtain an IP address automatically:
Select this option, the router will be able to obtain IP
network information dynamically from a DHCP server provided by your ISP.
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.
