# DUID Configuration List

A Device-Unique Identification (DUID) identifies a network device such as a host or a router. You can use the DUID (or a name associated with the DUID) to determine how an interface performs prefix delegation for a particular router or host that has a particular DUID.

Each DUID entry table lists the following information:

- IAPD-ID: An Identity Association Prefix Delegation-Identification (IAPD-ID) is a positive integer that identifies a certain prefix on the server. The client can use this value to request a specific prefix from the server.

- Prefix: The 48-bit to 64-bit prefix for each DUID entry that you want to specify for use on a DHCPv6 server.

- Preferred Lifetime: The period that the entry is active. It can be permanent or specified in the format days:hours:minutes:seconds.

- Valid Lifetime (optional): The period during which the entry is valid. It can be permanent or specified in the format days:hours:minutes:seconds.

- Configure: This column lists Edit and Remove options.

## Changing Viewing Preferences

You can choose to view 5, 10, 20, 50, or 100 entries per page by selecting the number you want to view from the drop-down list in the upper left-hand corner of the page.

## Creating a DUID Entry

To create a new DUID entry, click New DUID.

## Adding a Prefix Entry

To add a prefix entry, click Add Prefix Entry, which appears across from the DUID entry name in the shaded header.

## Deleting a DUID Entry

To delete a DUID entry, click Remove, which appears in the shaded header.