The Virtual Machine Additions includes features designed to improve the integration and performance of a virtual machine. A guest operating system cannot be used efficiently until the Virtual Machine Additions is installed. Since it is not installed by default when you install R2, you must do so afterwards.

The installation process is very straightforward and there are very few problems that you will run into. If you are unable to install this component, check that you have the proper permissions. In order to run the Virtual Machine Additions Setup program, you require full administrative control on the guest operating system.

Connectivity Issues
People often run into connectivity problems with the guest operating system when running any type of virtualization software. To successfully network a guest operating system in Virtual Server 2005 R2, the network adapter for the guest operating system must be assigned the correct IP address.

The IP address of the virtual machine network adapter must be on the same physical subnet as the physical computer’s network adapter. Also verify that you have created a virtual network and assigned it to the Microsoft Loopback Adapter. The Microsoft Loopback Adapter provides the network connection between the guest operating system and the host operating system.

Finally, you may also see networking problems between guest operating systems on the same network. Any virtual machines on the same network that have the same Media Access Control (MAC) address will not recognize each other. The solution is to configure the network adapter for each guest operating system with a unique MAC address.

You can configure the MAC address using the steps described below.

  1. Open the Administration Web site.
  2. Under Virtual Machines, point to Configure and select the appropriate virtual machine.
  3. Select Network Adapters.
  4. In the Connect to section for the appropriate network adapter, select the virtual network that you want to connect the network adapter to.
  5. In the Ethernet (MAC) address section, select static and type in a unique MAC address.

As you can see, there are a handful of common problems that can pop up when you are running Virtual Server 2005 R2, most of which are relatively easy to resolve. The majority of problems can be avoided by paying close attention to installation requirements and directions. If you are unable to resolve the problem using the recommendations described throughout this article, chances are you have encountered one of those more uncommon problems that will require you to dig a little further to find a solution.

[tags]virtual server, r2[/tags]