"The following IP/MAC addresses have already been used by running virtual machines: MAC addresses IP addresses: " error when powering on a virtual machine in VMware Cloud Director

Products

• VMware Cloud Director

Issue/Introduction

Powering on a virtual machine in Cloud Director fails with a UI error in the form:

The following IP/MAC addresses have already been used by running virtual machines: MAC addresses: IP addresses: xx:xx:xx:xx  Use the Fence vApp option to use same MAC/IP. Fencing allows identical virtual machines in different vApps to be powered on without conflict, by isolating the MAC and IP address of the virtual machine.

Environment

VMware Cloud Director 10.6.x

Cause

This is expected behavior when there is a conflict of IP address allocated in external network.

Allocated IP address can be found in "Gateway IP Allocations" under External Networks.

Resolution

Work with network design team:

1. Change the IP address of the running virtual machine out of allocated in external network.

2.Adjust allocated IP range from external network.

Additional Information

Add an External Network Connection to an NSX Edge Gateway in VMware Cloud Director