DHCP reservations using a unique identifer (Not a MAC address)

Question

_{Wednesday, May 29, 2013 3:57 AM | 1 vote}

I am trying to create a DHCP reservation based on a 20 character unique identifier (Not a MAC address)

When the client requests an IP address it does not get the reservation correctly.

I tried connecting to the DHCP server, obtained an IP address successfully, then went to the DHCP leases and right clicked the lease to create a reservation based on the unique identifier, but upon releasing and reconnecting I got a different address.

Also I have found that other people have been assigned the reserved address which is very mystyfying!

The 20 character identifier that is being used can potentially have the same first 12 digits, so I wonder if this is confusing the DHCP server as it could be expecting a 12 character MAC address.

All replies (2)

_{Thursday, May 30, 2013 8:23 AM ✅Answered}

Firstly, would you please let us know the edition of your DHCP server.

Meanwhile, based on my knowledge, we can only use MAC address to configure DHCP Reservations in current DHCP servers.

To create a reservation:

1. In the DHCP snap-in, expand the scope for which you want to create a reservation.

2. Select and right-click Reservations, and then click New Reservation.

3. In the NewReservation dialog box, enter the Reservation name, IP address, MAC address, and Description of the reservation.

4. Select the appropriate Supported types: DHCP only, BOOTP only, or Both.

5. Click Add.

Quote from: Creating Reservations

Thanks.

_{Wednesday, June 5, 2013 3:35 AM}

Thanks Alex, but mysteriously the problem seems to have gone away now, we can create a reservation based on a 20 chararcter identifier and it is now "Sticking" correctly!

I appreciate this is probably not that common as the majority of people will be using MAC addresses!