Slowness with Windows 2008 R2 and Virtual Machines

In my last post I walked through my network setup.  I added an additional VM to the host machine for a web server (Windows 2008 x86 SP2).  After adding this I was getting extremely slow download speeds ( 1- 10 KB per second) and I have FIOS.  I was even getting the problem from a machine inside the network.  After a while of searching I found the solution.

 

Disable TCP Offload on both the HOST and the Virtual Machine.

1. Open the NIC Card Properties
2. Click on configure
3. Under the advanced tab – turn of CheckSum Offloading

Problem Resolved.

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