With Windows Server 2008 R2, you may encounter that you are unable to add a DHCP
reservation if the reservation you are attempting to create is not within the
address pool range.
|Address Pool||192.168.1.1 - 192.168.1.100|
Consider the following scearnio:
- You have a computer that is running Windows Server 2008 R2.
- Dynamic Host Configuration Protocol (DHCP) Server role is installed.
- There is an active scope on the DHCP server
- The distribution range does not cover all IP addresses in the scope.
- You try to add a reservation to the scope, but the reservation is outside the scope range.
The reservation for 192.168.1.101 may fail. The error message that will be displayed is:
"The specified DHCP client is not a reserved client"
The Windows 2008 R2 DHCP Server will not allow reservations to fall outside of the configured address pool.
To resolve this issue, expand the address pool to cover the entire subnet. If you do not want the DHCP server to assign addresses
in a portion of the address pool, create an exclusion range. DHCP Reservations can be created even if they fall within an
The new scope for this example should look like this:
|Address Pool||192.168.1.1 - 192.168.1.254|
|Exclusion Range||192.168.101 - 192.168.1.254|
Alternatively, you could install a hotfix that is avaiable on the Microsoft website to correct this behavior.
Recommended Books & Training Resources