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DHCP mac binding with pxe boot

I'm seeing issues running DHCP in my routers with pxe boot in the boot sequence of the pc ahead of hard drive.

What I see when looking at the bindings are two ip addresses handed out by DHCP for one client.  One ip is without the 01 ethernet type prefix (address given at pxe post time) and a second ip given out when the PC boots from the hard drive, this ip containint the 01 ethernet type.

Is there any way within the DHCP server in the router to clear the first binding(the mac without the 01 prefix) when a second DHCP request comes in from the same mac with the 01 ethernet type in the mac. 

Any other suggestions are appreciated.

Thanks,


Dave

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