DHCP server does not allow reservation of a Mac address, although it is not reserved yet.

Question

I have two DHCP servers within an active directory. Each client gets a static IP, for which its mac address is reserved.
Now I have a problem with one mac address of a single client. It is impossible to reserve it in first DHCP server.
The second one accepts the reservation, but after that replication with the first server fails.
I've double checked if the mac address or the IP is already used, but it is not.

Even with Powershell's Get-DhcpServerv4Reservation and Get-DhcpServerv4Lease I don't find any use of this specific mac address.
Is there another way to read the DHCP database besides Powershell?
Could a mac address be corrupted in any way?
Or is there another reason why a mac address cannot be reserved?

Answer 1

Hello

Thank you for your question and reaching out. I can understand you are having issues related to MAC reservation.

1. Most of time is the reservation entry if mac address is not correctly entered ,or if you have two network cards and you enter the wrong interface mac details .
2. Please check if there is not any other DHCP Server on the network other than that.
3. Exclude 70-85 from the scope in DHCP management. When the clients check back to renew their leases
4. Please make sure that you make reservation for IP in the address pool

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