A VM’s MAC address can be used for network diagnostics and other purposes. If the "MAC Address Changes" policy is set to accept (or true, via PowerCLI), this is a finding.įor each virtual switch and port group, click Edit settings (dots) and change "MAC Address Changes" to reject. Checking a MAC Address in vSphere Client. Open the Hyper-V console and go to the virtual machine settings.
#Vmware mac address change software
We usually have to do this kind of operation on machines where the software uses the MAC address cards to generate the licenses. Get-VirtualPortGroup | Get-SecurityPolicy It is possible in Hyper-V as in VMware to change the MAC address of a network adapter of a virtual machine. View the properties on each virtual switch and port group and verify "MAC Address Changes" is set to reject.įrom a PowerCLI command prompt while connected to the ESXi host, run the following commands: VMware vSphere 6.7 ESXi Security Technical Implementation Guideĭetails Check Text ( C-42547r674869_chk )įrom the vSphere Client, go to Configure > Networking > Virtual Switches. Switch-level settings can be overridden at the Portgroup level. Reject MAC Changes can be set at the vSwitch and/or the Portgroup level. It will affect applications that require this functionality, how a layer 2 bridge will operate, and applications that require a specific MAC address for licensing. This will prevent VMs from changing their effective MAC address. This allows it to stage malicious attacks on the devices in a network by impersonating a network adaptor authorized by the receiving network. For each virtual switch go to properties and change "MAC Address Changes" to reject for the switch and each port group.If the virtual machine operating system changes the MAC address, it can send frames with an impersonated source MAC address at any time. If the "MAC Address Changes" policy is set to accept, this is a finding.įrom the vSphere Client go to Configuration > Networking > vSphere Standard Switch. Get-VirtualPortGroup | Get-SecurityPolicy
View the properties on each virtual switch and port group and verify "MAC Address Changes" is set to reject.įrom a PowerCLI command prompt while connected to the ESXi host run the following commands: MAC won’t change frequently until there is no change with the server hardware.Achieving this in virtual Machine is bit tricky because there are many chances MAC address will change, if the location of the virtual machine changes or If you have a plan to convert a physical server to virtual server using P2V. VMware vSphere ESXi 6.0 Security Technical Implementation Guideįrom the vSphere Client go to Configuration > Networking > vSphere Standard Switch. You can override switch level settings at the Portgroup level.
This will also affect applications that require a specific MAC address for licensing. The MAC addresses of the host interfaces, shown in the vSphere Client. 1 shows the three interfaces on a ProLiant ML 350 host in my lab. This will also affect how a layer 2 bridge will operate. The first step would be to clearly identify the MAC addresses of the network adapters of the host, which is done in the network adapters section of the vSphere Client.
It will affect applications that require this functionality. If the virtual machine operating system changes the MAC address, it can send frames with an impersonated source MAC address at any time.
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