So if I wanted to set a static IP for a Windows Server 2012 VM in order for clients to connect to it as a DHCP and other roles, I would need to reserve the address on the router for the IP of the VM I'm guessing?ĮDIT: To quash your Type-2 setup fears this is for a test environment only.Īssuming your server hands out DHCP over the entire subnet, then yes, you must reserve the static IP so that you don't risk two NICs grabbing an overlapping IP. When bridged, your guest acts like like a first class citizen on the network and is seen transparently by other network devices as if it was on the network directly itself.Īh right, since they create virtual NICs. A DHCP address, floating or reserved, will work just fine. No, static IPs are not needed in this scenario. The host OS can be on a different subnet than the VM it doesn't matter because they are not associated. The VM connects to a virtual switch in the host OS the same level as the host OS. The bridged interface connects below the host operating system. 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.No your VM host system does not need a static (fixed) IP address, or any IP address for that matter. 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: 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. 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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