We recently upgraded our DHCP servers to Windows Server 2012 and are taking advantage of the built-in DHCP failover. We have 2 servers, configured in Load Balance mode, 50/50 percentage split.
We are seeing errors in the event logs that suggest one scope is out of addresses:
DHCP client request from B8AC6F9F5B68 was dropped since the applicable IP address ranges in scope/superscope Central are out of available IP addresses. This could be because of IP address ranges of a policy being out of available IP addresses.
Looking on the 2 servers, against the scope that is reporting it is out of addresses, this is what I see.
Server 1:
Total Addresses: 42
In Use: 37
Available: 5
Addresses Available (this Server's pool): 0
Addresses Available (Partner pool): 5
Addresses Granted (this Server's Pool): 35
Addresses Granted (Partner pool): 2
Server 2:
Total Addresses: 42
In Use: 37
Available: 5
Addresses Available (this Server's pool): 0
Addresses Available (Partner pool): 5
Addresses Granted (this Server's Pool): 7
Addresses Granted (Partner pool): 30
I don't understand why there are 5 addresses but yet we continue to see the error messages in the event logs saying the scope is out of addresses. Also, why do the figures for address available not make sense, eg: server 1 says it has no addresses
in it's pool, 5 addresses in the partner pool, server 2 says the same...