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2517 - Overriding inherited DHCP options in NIOS


You realized that one of the Grid members serving DHCP for a branch office can be better managed by changing all of its default lease time to something different than the inherited value from the Grid. Please override this inherited configuration and verify it has taken effect.

Estimate Completion Time

  • 10 to 15 minutes






Grid Manager UI




  • Administrative DHCP access to the Grid

Course References

  • 1003: NIOS DHCP Service Overview

  • 2004: Configuring NIOS DHCP Service and Properties

Lab Initiation

Access jump-desktop

Once the lab is deployed, you can access the virtual machines required to complete this lab activity. To initiate the lab, click on the jump-desktop tile and login to the Linux UI:

Username: training

Password: infoblox

Initiate lab

To initiate the lab, double-click the Launch Lab icon on the Desktop.

Launch Lab

Launch Lab

Choose the lab number from the list and click OK.

After clicking OK, you will see a pop-up message with a brief description of the lab task. If the description looks correct, click Yes to continue lab initiation.

Lab initiation will take a couple of minutes to finish.

Once complete, you will see another pop-up message with the login credentials and the URL for the Grid Manager’s User Interface. Note that the credentials may differ from those from prior labs.

Screenshot 2024-05-06 at 3.16.57 PM.png


  1. Overriding the inherited option.

  2. Restarting Grid services.

  3. Reading the DHCP member configuration.

Task 1: Overriding inherited options

The default lease time for the Grid does not work for the member Please make the necessary changes so all networks served by ibns2 have the default lease time of 900 seconds (15 minutes).

Task 2: Restarting Grid services

After saving changes, you should be prompted to restart services. If not, please manually restart services.

Task 3: Reading the DHCP member configuration

Please verify by examining the DHCP configuration file for



Task 1 Solution: Overriding inherited options

  1. Navigate to Data Management DHCP Members

  2. Click the hamburger icon (=) next to ibns2 and choose Edit.

  3. In the General section, scroll down to find Lease Time

  4. Click Override and change the value to 15 minutes

  5. Click Save and Close to save changes

Task 2 Solution: Restarting Grid services

Changes made to the DHCP configuration only take effect after a service restart.

  1. Restart the DHCP Service by clicking the Restart button in the notification banner at the top of Grid Manager

  2. At the Restart Grid Services window, click Restart

Alternatively, we can also restart services from the Members menu.

  1. Navigate to Grid Grid Manager Members

  2. Place a check mark in the box beside

  3. From the Toolbar on the right, click Restart Services

  4. Select the radio button for Force service restart

  5. Click Restart

Task 3: Reading the DHCP member configuration

  1. Navigate to Data Management → DHCP → Members → Members

  2. Place a check mark in the box next to

  3. From the Toolbar on the right, click View DHCP Configuration

  4. Select IPv4(Disable pop up blocker)

  5. In the configuration file, locate the value of default-lease-time, it should be 900 seconds equivalent to 15mins.

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