Lease file questions

Simon Hobson dhcp1 at
Fri Nov 16 23:21:49 UTC 2007

Ryan McCain wrote:

>Doing a quick google search and looking in the index of "The DHCP 
>Handbook" didn't turn up any results on how the UID is formed.  Any 
>clue on this?

There is no 'rule' - it's simply any unique string (optionally) 
provided by the client. Some clients (specifically Windows) set this 
to the hardware address, others (including Mac OS X and Linux) don't 
supply it by default. In most cases (I've heard that even Windows 
supports it), the user/administrator can configure this in the device.

Interestingly, I've looked up the first three bytes of the hardware 
address, and they aren't allocated to anyone for use in ethernet.

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