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Network Load Balancing and Microsoft Virtual Machines

Ben Armstrong sets the record straight about using Microsoft network load balancing and Microsoft virtual machines.  He says, two issues to be aware of are:

  1. Virtual Server / Virtual PC will not utilize any NLB capabilities on the host operating system.  This is because Virtual Server / Virtual PC perform their network operations at a lower layer on the host network stack than NLB.  Note - Virtual Server and Virtual PC will function correctly when NLB is present on the host - they will just not benefit from it.
  2. Virtual Server / Virtual PC have some network optimizations that actually cause problems when running NLB systems inside of virtual machines.  These optimizations are simply that if we see a network packet that is going from the host to a virtual machine, or from a virtual machine to another virtual machine, we will send the packet directly to that virtual machine - without sending a copy of it on to the physical network connection.  Similarly if we see a network packet coming into the physical computer that is destined for the host operating system - we will not send it on to any of the virtual machines.

Find out the rest of the problems and results by visiting his site and leaving your comments.

Visit his site and the original article, here.

 

Published Thursday, March 23, 2006 8:10 AM by David Marshall
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