Hot plugging and unplugging of vNICs attached to a virtual machine is now supported. It is no longer necessary to stop the virtual machine before adding or removing vNICs.

It is now possible to define logical networks on a virtualization host without requiring a bridge to support that network. A bridge is now only required if the logical network is marked as a virtual machine network, other logical network types do not require a bridge.

The network setup dialog box has been updated to better support complex networking operations. It is now possible to add or remove networks, add or remove bonds, and attach networks to bonds or detach networks from bonds in a single transaction.

It is now possible to configure the virtual Network Interface Card (vNIC) of a virtual machine to run in promiscuous mode. This allows the virtual machine to monitor all traffic to other vNICs exposed by the host on which it runs. This facility is useful for intrusion detection and other virtual appliances. Only users for which administrators have defined a custom role with the Manipulate port mirroring action group attached to it will be able to enable or disable port mirroring for a virtual machine.

Support for configuring the MTU of a logical network is now available from the Edit Logical Network screen.

By default nwfilter rules are now defined for all virtual machines, enhancing security. To disable this functionality set the value of the EnableMACAntiSpoofingFilterRules configuration key to False using the rhevm-config command.