Microsoft Windows Server DHCP 2012 Percentage IPV4 Individual Scope Monitoring, returns a property bag containing the number of free percentage in the specified scope.
These are the parameters that we could override, if need it:
Number of Samples: Number of times to wait to calculate the new state of the monitor.
Warning Threshold: Minimum Percentage accepted as Healthy State.
Error Threshold: Minimum Percentage accepted as Warning State.
Interval Seconds: Amount of Seconds for each execution
Sync Time: Time expressed with this format: "hh:mm" since you will like to start the execution.
Timeout Seconds: Amount of seconds to wait until cancel execution for "timeout reasons."
Initial Row: Initial Row used for paging. Default value is 0 which returns all records.
Final Row: Final Row used for paging. Default value is 0 which returns all records.
Maximum supported paging quantity is 2,000 scopes
Check available scope addresses.
If the DHCP server 2012 does not have IP addresses available to provide to its clients, they could fail to obtain new assigned IPs. When this occurs, consider the following possible solutions:
Use scope extension to expand the address range for the current scope.
Reduce the lease duration and decrease the cleanup interval. This can help to speed the reclaiming of expired scope IP addresses.
Extend the DHCP scope
If you already have a DHCP scope and the Start Address and End Address do not currently include all addresses for your specific subnet, you can increase the number of addresses in the scope by extending the Start Address or End Address in the scope properties.
To increase the number of addresses available to clients:
At the DHCP server, click Start, point to Administrative Tools, and then click DHCP.
In the console tree, right-click the scope you want to extend, and then click Properties.
Change Start IP Address and End IP Address to extend the scope.
Reduce the lease duration
To perform these procedures, you must be a member of the Administrators group, or you must have been delegated the appropriate authority.
To reduce the lease duration:
In the DCHP console tree, right-click the scope you want to configure, and then click Properties.
On the General tab, under Lease duration for DHCP clients, type the new lease duration.
Decrease the cleanup interval
To use a Netsh command to set the cleanup interval time:
At the DHCP server, click Start, click Run, type cmd, and then press ENTER.
netsh dhcp set databasecleanupinterval "NewInterval"
(where "NewInterval" is the amount of time in minutes between DHCP database cleanups).
In the following example, this command sets the database cleanup interval to 10,080 minutes (every seven days).
netsh dhcp set databasecleanupinterval 10080