IPv4 reservations check all of Option 61, not just MAC address

I am trying to use Server 2012 R2 DHCP to assign IPv4 addresses in a mixed network.
Most systems send a very brief Client Identifier (Option 61) which includes only hardware type and MAC address. Some systems (most importantly Fedora 21 in my case) send more information including an IAID, DUID type, and time in addition to hardware
type and MAC address. MAC address still comes at the end of the option.
I am attempting to use reservations to assign addresses to workstations, but DHCP doesn't seem to know what to do with the extended options sent by Fedora 21; it checks all of the client identifier against the MAC address and then rejects the request because
the client identifier has additional information. Has anyone found a server setting to resolve this? Once a Fedora client is set up it can be configured to send only the MAC address and hardware type in Option 61, but I am looking for something
that will work with the default options. It seems odd to me that DHCP requires a MAC address to identify clients in a reservation, but compares the MAC address to all of the contents of Option 61.

Hi,
According to your description, my understanding is that DHCP server(Windows Server 2012) can’t reserve IP address to Fedora 21, due to extended options(61) sent by this client.
Windows DHCP server, reservation is based on MAC address. as you mentioned that DHCP server will check the message sent from the client, if the matched MAC address has been detected, reserved IP address will assign to the client.
As far as I know, there is no additional setting for Windows DHCP server to control the identifiable field of message sent from client.
Configure the Fedora client to send only the MAC address and hardware type in Option 61, could be a better way to resolve this problem.
Best Regards,
Eve Wang
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IPv4 reservations check all of Option 61, not just MAC address

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