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    Hello!

    I have setup a test enviroment with one Hyper-V R2 Core installation running 4 VM. I have only one NIC.

    My problem is that occationally the Hyper-V looses network connection. No error messages. I can´t ping to or ping from. I cannot reach the server via RSAT either.

    My only option is to restart the Hyper-V server. After that everything will work again, until next time.

    I have tested with other Hypervisors like Xenserver and ESXi with the same hardware without such symptom.

    Thursday, May 17, 2012 9:56 AM

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    Hi,

    Please check the following KBs to see whether you can resolve the issue.

    The network connection of a running Hyper-V virtual machine may be lost under heavy outgoing network traffic on a computer that is running Windows Server 2008 R2 SP1
    http://support.microsoft.com/kb/2263829

    The network connection of a running Hyper-V virtual machine is lost under heavy outgoing network traffic on a Windows Server 2008 R2-based computer
    http://support.microsoft.com/kb/974909
    Friday, May 18, 2012 3:23 AM

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    Hi,

    When you had issue with Hyper-V host, did you have the same issue with virtual machines?

    By the way, you may need to disable TCP Offloading to see whether you can resolve the issue. 

    For more information, you can refer to:

    2 NICs on Hyper-V on the same subnet
    http://social.technet.microsoft.com/Forums/en-US/winserverhyperv/thread/7f386df0-0632-4064-8377-e3eeeb5ef446

    Thursday, May 17, 2012 3:05 PM
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    When you had issue with Hyper-V host, did you have the same issue with virtual machines?

    Yes, that was how I first noticed the problem.

    Thursday, May 17, 2012 7:30 PM
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    Hi,

    Please check the following KBs to see whether you can resolve the issue.

    The network connection of a running Hyper-V virtual machine may be lost under heavy outgoing network traffic on a computer that is running Windows Server 2008 R2 SP1
    http://support.microsoft.com/kb/2263829

    The network connection of a running Hyper-V virtual machine is lost under heavy outgoing network traffic on a Windows Server 2008 R2-based computer
    http://support.microsoft.com/kb/974909
    Friday, May 18, 2012 3:23 AM
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    Hi,

    Have you tried the suggestion? I want to see if the information provided was helpful. Your feedback is very useful for the further research. Please feel free to let me know if you have addition questions.

    Monday, May 21, 2012 2:39 PM
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    Hello, again.

    How do I do this: "disable TCP Offloading" on a Hyper-V Core?

    Sunday, May 27, 2012 7:16 AM