Service provider reported not allowed MAC addresses in subnet

[Mohammed Labeebudeen]

We were trying to install Citrix Hypervisor on a baremetal server. After installation, we have created two VMs on it with each vm have its own MAC address. Our service provider won't allow outgoing traffics from multiple mac addresses. The network configuration of our hypervisor should only let packets exit the system with the MAC address of the real NIC. So is there any way to overcome this ?

[Mark Syms]

This is not a problem with the hypervisor but an issue with your network service provider.

The only thing you could do is create a separate VM as a "router" VM and route the traffic from the other VMs through that with a NAT firewall. The VMs each need to have a unique MAC address as that is what is used to ensure that network traffic for the VMs is sent to the correct place.

[Tobias Kreidl]

I believe you can create your own MAC address for a VM: https://docs.citrix.com/en-us/xencenter/7-1/vms-network-properties.html

 

-=Tobias

[Mark Syms]

You can, but each VM still requires a unique MAC, so if the service provider is only allowing traffic for a single MAC you will need some form of NAT firewall routing to present all the traffic as if it came from a single point.