VM on the same host and vSwitch talk internally?

VM on the same host, using the same vSwitch automatically talk to each other internally on the host when they need pass data without using the NETWORK interface card or is there something specific that needs to be configured to do?

Thank you

With the virtual machines on the same vSwitch network traffic will proceed on via virtual network cards so the interaction network will not differ from the VM to communicate to a physical host.  Network traffic between virtual machines (assuming that they are on the same VLAN) will stay in the vSwitch and not go through the physical network on the host layer.  Thus the inter-VM traffic can exceed the speed of the NIC port in the vSwitch.

vSphere includes VM Communication Interface (VMCI) that allows a host to communicate with the virtual machines without going through the network layer.  You can also enable VMCI for VM VM communication.

http://pubs.VMware.com/VMCI-SDK/

http://KB.VMware.com/kb/1010806

Dave

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