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2516 - Creating DHCPv4 failover networks in NIOS


Your team has already created a DHCPv4 failover association. It is now time to provision a network to leverage this redundant service.

Estimate Completion Time

  • 10 to 15 minutes






Grid Manager UI




  • Administrative DHCP access to the Grid

  • Knowledge of which DHCPv4 failover associations to use

  • Basic DHCP configuration information such as the default gateway option

  • Network changes on DHCP relays such as routers to send DHCP messages to both Grid members

Course References

  • 2004 – Configuring NIOS DHCP Service and Properties

  • 2019 – Configuring NIOS DHCPv4 Failover

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. Reading DHCPv4 failover association configuration

  2. Creating a DHCPv4 failover network.

  3. Restarting Grid services.

Task 1: Reading DHCPv4 failover association configuration

The DHCPv4 failover association to use for this configuration is "D1-D2". Please read its configuration in order to create a DHCPv4 network to use this redundant service.

Task 2: Creating a DHCPv4 failover network

The IPv4 network that needs the redundant DHCP service is, with the default gateway

Task 3: Restarting Grid services

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



Task 1 Solution: Reading DHCPv4 failover association configuration

Understanding DHCP failover configuration is important for this task. While creating Network objects for DHCP failover ranges, both peers in the Failover Association should be assigned to the Network. Similarly, the MCLT value for DHCP failover association should also be verified to plan for service delivery.

  1. Navigate to Data Management  DHCP  Members  IPv4 DHCP Failover Associations

  2. Place a check next to D1-D2 and click Edit

  3. The General tab shows us the Members in a Failover Association

  4. The Advanced section (toggle advanced mode) of Failover Settings has the MCLT value

Task 2 Solution: Creating a DHCPv4 failover network

As stated above, while creating a Network meant for DHCP failover, the important step is to assign both the failover peers to the Network Object.

  1. Navigate to Data Management  DHCP  Networks  Networks

  2. Click the Add dropdown menu and select IPv4 Network

  3. Select the radio button for Add Network

  4. Click Next

  5. At Step 2 of 6, leave the Netmask set to 24

  6. Next to Networks, click the Add button

  7. Under the Network column, enter

  8. Click Next

  9. At Step 3 of 6, click the Add dropdown menu and select Add Infoblox Member, then click on the link for from the Member Selector window

  10. Repeat the above action once more to also assign to the Network

  11. Click Next after both the Members are populated

  12. At Step 4 of 7, click the Override button in the section for Routers (this will change the button color to black and the button will now say Inherit)

  13. Click the IP Address field in the Routers section

  14. Enter the IP address for the router on this network –

  15. Click Save & Close to save changes

Task 3 Solution: Restarting Grid services

Changes made to the DHCP configuration only take effect after the 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 by navigating to Grid  Grid Manager  Members or Data Management  DHCP  Members

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

  2. Select the radio button for Force restart services

  3. Click Restart

Note that the status of the failover association will display Failure until both networks and ranges have been assigned. This behavior is expected at the end of this lab.

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