PXE client receiving two IP addresses.
dhcp1 at thehobsons.co.uk
Mon Jan 24 07:56:17 UTC 2011
Pooja Gada wrote:
>We have been facing a problem with respect to the PXE clients, the
>DHCP Server is assigning two different IP addresses to the same
>device, one for PXE client and other when the machine boots up.
>Has anyone faced a similar problem ?
>And, is there is a workaround ?
Yes this is a known problem. The RFCs require that the Client-ID is
used as the primary key if present, and fallback to using the MAC
address if the client doesn't supply a Client-ID. Since MS chose to
supply a Client-ID by default (which is allowed) which nothing else
does, then the server treats them as two different clients.
There were some patches to deal with this by (IIRC) setting the
Client-ID to the MAC address if it wasn't supplied - thus making
other clients behave like the MS ones. I don't know if they are still
Or, write a class that matches PXE clients, and give them very short
leases from a different pool.
You should find something if you search the list archives - it's
popped up regularly (and been answered) quite a few times over the
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