Hyper-V Network Disconnects

LVITGUY 1 Reputation point
2020-10-22T21:27:41.473+00:00

Hey All,

I'm having trouble with the hyper-v network becoming unavailable.

The host is running Windows 2012 R2, fully patched. I have two VMs, both lose network access.

I'm able to access the host and connect to the VMs through the console, both are up and running normally.

A restart of the host fixes the issue temporarily but after a few days the network stalls out again.

I've found a documented broadcom NIC issue, but we have Intel NICs. I haven't found any other known issues.

Thanks in advance for any tips or ideas.

Hyper-V
Hyper-V
A Windows technology providing a hypervisor-based virtualization solution enabling customers to consolidate workloads onto a single server.
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  1. Dave Patrick 426.1K Reputation points MVP
    2020-10-22T21:29:37.163+00:00

    Please post an unedited ipconfig /all in both conditions.

    --please don't forget to Accept as answer if the reply is helpful--

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  2. Xiaowei He 9,866 Reputation points
    2020-10-23T05:34:33.1+00:00

    Hi,

    1. Please check if the network NIC driver is up to date, if not, please update the NIC driver.
    2. Please try to disable VMQ and TCP offloading on the NIC, check if it could help:

    Disable TCP offloading which would cause network delays and intermittent failures, open CMD as administrator and run the following command to disable TCP offloading:

    Netsh int tcp set global chimney=disabled
    Netsh int tcp set global netdma=disabled
    Netsh int tcp set global autotuninglevel=disabled
    netsh interface teredo set state disabled
    netsh int ipv4 set global taskoffload=disabled

    Open powershell and run the following command to disable VMQ:

    Set-NetAdapterVmq -Name "NIC 1" -Enabled $False

    Besides, please check if there's any network throttling configure on the host, if yes, please try to disable the throttling.

    Thanks for your time!
    Best Regards,
    Anne

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