dhcp1 at thehobsons.co.uk
Sat Jul 28 07:23:20 UTC 2012
Julie Xu wrote:
>I get complain about new machines. the problem is :
> when new machine come online first time, it get one ip
>address. when the machine reinstall company image and reboot, even
>it is in 10 minutes time, it get another ip address.
let me guess, the company image is Windows, and the <something else>
booted before that is not Windows ?
It's most likely that the first system booted does not send a
Client-ID - this is the default for pretty much everything other than
Then when the system is booted with Windows, a Client-ID is used.
The ISC server uses the Client-ID as the primary database key if one
is supplied, and only falls back to the MAC (hardware) address if
there is no Client-ID. So the two systems are different clients as
far as the server is concerned.
There used to be some patches that would "fix" this, but I've not
heard of them for a while and I've no idea if they are maintained. If
not maintained, they wouldn't work (I assume) against the current
But the obvious question is does it actually matter ?
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