Avoid Windows Server 2012 R2 DHCP servers from giving IPs that are static assigned?

[riahc3]

There are PC on my network that have a IP static assigned. Is there any way the DHCP server can detect a IP that has already been assigned by a client on the network and not reassign it to avoid IP conflicts?

 

[xSauronx]

There are PC on my network that have a IP static assigned. Is there any way the DHCP server can detect a IP that has already been assigned by a client on the network and not reassign it to avoid IP conflicts?

well you should have a couple of things configured

the DHCP scope should not overlap, or should have exclusions for, ranges of assigned static addresses.

that is, if your subnet is 192.168.150.0 /24, and you have static IPs assigned as 192.168.150.1-49, then you create a DHCP scope of
1 - 192.168.150.50 - 200
or
2 - 192.168.150.1 - 200 with exclusion 192.168.150.1-49 [i think this is best practice, since you can arrange exclusions to cover address range changes without having to delete/recreate the entire scope]

second, you can enable address conflict detection for the dhcp server. this will ping an IP before handing it out when a request comes in.
https://technet.microsoft.com/en-us/library/cc737924(v=ws.10).aspx

you could, if you wanted, also just let the PCs get a DHCP address, then right-click the lease in the dhcp scope and assign that pc to a DHCP reservation, so that it will only get that particular IP address assigned from the DHCP server every time it asks for an address/renewal [based on the mac address of the network adapter in the pc]

 

[riahc3]

second, you can enable address conflict detection for the dhcp server. this will ping an IP before handing it out when a request comes in.
https://technet.microsoft.com/en-us/library/cc737924(v=ws.10).aspx

Thats EXACTLY what I wanted. 3 pings should be enough to check if the IP is free or not. Thank you for making my life easier.

 

[DrGreen2007]

Put in a reservation on the DHCP server so it wont give out that IP?

 

[BonzaiDuck]

Put in a reservation on the DHCP server so it wont give out that IP?

I agree with both respondents. With my limited experience, I know that a server OS such as yours can be a DHCP server. So can a gigabit router, though.

Either way, you should be able to create reservations for the individual static addresses within the DHCP assignment range, or simply exclude a sub-range of addresses used for static assignment from DHCP range. I actually do it both ways with a total of 256 addresses in my subnet range, with the DHCP range beginning at 100, ending at 200. I have printers and workstations with static addresses below 100. If it had been more convenient to let DHCP assign an address to a workstation or device, I then reserve that specific address for that particular device and MAC at the router. I couldn't imagine how it would be any different if the server itself is also acting as DHCP server (in which case you'd turn off that feature in your router hardware).