Multiple IP Addresses for a single MAC address

Glenn Satchell Glenn.Satchell at
Wed Sep 5 23:33:38 UTC 2007

>Date: Wed, 5 Sep 2007 20:43:02 +0100
>To: dhcp-users at
>From: Simon Hobson <dhcp1 at>
>Subject: Re: Multiple IP Addresses for a single MAC address
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>daniel.bender at wrote:
>>Can anyone shed some light on the following problem we are encountering?
>Sigh, check the archives, look for PXE - it comes up and is explained 
>every few months.
>In short, your OS (Windows I assume) supplies a client-id whilst PXE 
>Boot doesn't - therefore they are (as far as the DHCP Server is 
>concerned different clients and are given different addresses. This 
>is in accordance with the RFC.

Another workaround is to create a class for PXE clients and set a really
short lease time, say 10 or 20 minutes. About the time it takes for the
PXE installation, so the lease will expire shortly after the PXE part
is finished. Examples are in the archives.


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