How to configure DHCP Exclusion range – Windows Server 2012 R2.

http://www.prohut.net: In this video we have explained the steps of configuring DHCP Exclusion in Windows server 2012 R2.

DHCP Exclusion is the range of IPs that you don’t want DHCP Server to assign.

Transcript:

Hello friends, welcome back to ProHut IT Services. Good to see you back.

In this video, we’ll learn the steps of configuring exclusion in DHCP Server on Windows Server 2012 R2.

To start with, click on start, click on down arrow, select DHCP. This will open DHCP Console.

Expand Server Name, expand IPv4, expand scope.

Select Address Pool. It shows the range of IPs that we have considered while creating scope. In this example, we can see that start IP is 192.168.1.100 and end IP is 192.168.1.200. This means that our DHCP Server will start assigning IPs from 192.168.1.100.

Now click on Address leases. It shows list of IPs that are already assigned by DHCP Server. In this example, we can see that IP address 192.168.1.100 is assigned to Win8-01 machine and IP Address 192.168.1.101 is assigned to Win8-02 machine.

It also gives information about the lease expiration i.e. when the lease is going to expire for these machines.

To add exclusion range, we need to select “Address Pool” and right click on Address Pool and click on “New Exclusion Range”. This will open Add exclusion Window. We’ll close this window and see another option to add exclusion.

Click on Yellow Star on the top, it will open the same Exclusion window.

Let’s define the range of IPs that we want to exclude. DCHP server will not assign these IPs. For this video we’ll define a range from 192.168.1.100 to 192.168.1.120. Click on Add and then close this window.

Let’s go to client machine to verify if it has taken another IP or not. On client, open command prompt.

Type Ipconfig /release to release old IP Address.

Type Ipconfig /renew to renew an IP Address.

Great, it has taken an IP Address 192.168.1.121.

Let’s go back to our second client machine and verify if it is taking another IP or not.

Open command prompt, type Ipconfig/ release to release an existing IP. Type Ipconfig /renew to request new IP address.

Great, this machine has taken an IP Address 192.168.1.122.

Let’s go back to our DHCP Server. Select Address leases and refresh the window.

Boom, we can see new IPs appearing here. Win8-01 is assigned with new IP Address i.e. 192.168.1.121 and Win8-02 also assigned with new IP i.e. 192.168.1.122.

To conclude, let’s go back to Address Pool and verify our configuration.
We defined the range of IPs from 192.168.1.100 to 192.168.1.200. This means that DHCP Server is authorized to assign IPs from 192.168.1.100 to 192.168.1.200.

But we have also defined an exclusion range from 192.168.1.100 to 192.168.1.120, which means, that DHCP Server is going to exclude an IP address range from 192.168.1.100 to 192.168.1.120. And it will start assigning IPs from 192.168.1.121.

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