Advanced Windows PowerShell Scripting Video Training

Advanced Windows PowerShell Scripting Video Training
Advanced Windows PowerShell Scripting Video Training

Tuesday, November 1, 2011

What is the DUID found with IPv6 DHCP?

Below is a screen shot of an IPConfig /all command:

image

The question from class is “What is the DUID?”

 

According to section 9 of RFC3315, DHCP servers use DUIDs to identify clients for the selection of configuration parameters and in the association of IAs with clients.  An IA (Identity Association) is a collection of addresses assigned to a client.  The DUID must be both unique in the environment and to be dynamically created.  This is because some devices cannot store this information.  For this reason, a DUID is generated in one of 3 ways.  The link above contains more detailed information.

  • Link-layer Address Plus Time
  • Vendor-assigned unique ID based on Enterprise Number
  • Link-Layer address

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