Unable to set VCHA it fail with error "A dynamic IP configuration was found on the management network interface (NIC 0) of the Active node. vCenter HA requires static IP addresses."

Products

• VMware vCenter Server

Issue/Introduction

This issue might happen if previously there was a VCHA and it was destroyed.

Symptoms:
Unable to set VCHA

GUI it throws error "A dynamic IP configuration was found on the management network interface (NIC 0) of the Active node. vCenter HA requires static IP addresses. Log in to the appliance management interface of the Active node to remove any dynamic IP addresses and switch off any IPv6 DHCP or router advertisement settings."
Login to VAMI page show static IP and no IPv6

Cause

VAMI page is showing invalid information

Resolution

Checking and Configuring Network Interfaces

To verify the configuration of your network interfaces (eth0 and eth1 if present), follow these steps:

1. Locate Configuration Files:

• Network interface configurations are stored in /etc/systemd/network/.
• List the configuration files using the command: ls /etc/systemd/network/

     2.View a Specific Interface Configuration:

• For example, to view the configuration of eth0, use the command: cat /etc/systemd/network/10-eth0.network

     3.Validate DHCP Settings:

• Ensure that IPv6 is disabled within the DHCP configuration.
• Look for a line similar to DHCP=IPv6 and ensure it's set to DHCP=no.
• An example of a correct configuration is:
  [Match] Name=eth0 [Network] Gateway=192.168.0.1 Address=192.168.0.51/24 DHCP=no

     4.Correcting IPv6 Configuration:

• If IPv6 is enabled in the DHCP settings, you can resolve this by accessing the VAMI (vCenter Server Appliance Management Interface) page.
• Edit the network configuration, ensure IPv6 is disabled, set a static IP address, and save the changes.
• In some cases, you may not need to modify the settings. Simply editing and saving the existing configuration can update the eth configuration files and resolve the issue.

This approach provides a clear and concise guide, making it easier for users to understand and follow. It includes key steps, examples, and explanations, along with troubleshooting tips.

Additional Information