2517 - Overriding inherited DHCP options in NIOS
Scenario
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
Credentials
Description | Username | Password | URL or IP |
|---|---|---|---|
Grid Manager UI | admin | infoblox |
Requirements
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
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.
Tasks
Overriding the inherited option.
Restarting Grid services.
Reading the DHCP member configuration.
Task 1: Overriding inherited options
The default lease time for the Grid does not work for the member ibns2.techblue.net. 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 ibns2.techblue.net.
Solutions
Task 1 Solution: Overriding inherited options
Navigate to Data Management → DHCP → Members
Click the hamburger icon (=) next to ibns2 and choose Edit.
In the General section, scroll down to find Lease Time
Click Override and change the value to 15 minutes
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.
Restart the DHCP Service by clicking the Restart button in the notification banner at the top of Grid Manager
At the Restart Grid Services window, click Restart
Alternatively, we can also restart services from the Members menu.
Navigate to Grid → Grid Manager → Members
Place a check mark in the box beside ibns2.techblue.net
From the Toolbar on the right, click Restart Services
Select the radio button for Force service restart
Click Restart
Task 3: Reading the DHCP member configuration
Navigate to Data Management → DHCP → Members → Members
Place a check mark in the box next to ibns2.techblue.net
From the Toolbar on the right, click View DHCP Configuration
Select IPv4(Disable pop up blocker)
In the configuration file, locate the value of default-lease-time, it should be 900 seconds equivalent to 15mins.