Hyper-V VM Network issue

Question

I recently setup a Hyper-V cluster successfully. Everything was working fine but later when i migrated my workload to hyperv cluster i notice some of VMs start network issue. VM not able to detect the network (unidentified network) nor able to ping vice versa.

I have two Dell poweredge R420 Servers

Same OS installed on both servers

Some Of VMs have network issue on one server but same of VMs working fine on another server.

I search lot for this issue and got to know that there is similar issue mentioned in Microsoft articles. https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/vm-lose-network-connectivity-broadcom

As per microosft this is only with Server 2012 HyperV but i am facing same issue with Server 2022 HyperV as well. As a work around Microsoft said we can resolve this by disabling the VMQ but in my case VMQ is already disabled.

Currently Microsoft Provider driver is installed for network adaptor:-

InterfaceDescription : Broadcom NetXtreme Gigabit Ethernet

DriverVersion        : 214.0.0.0

DriverDate           : 2018-04-06

DriverProvider       : Microsoft

is there anyone face similar issue in their experience or know any fix for this issue. If anyone can help that would be great. Thanks !!!

Answer 1

Hello

Thank you for your question and reaching out. I can understand you are having query\issues related to Hyper-V Cluster VMs network.

1. Microsoft's native NIC drivers for the host were probably used in the construction of the hypervisor. Replacing using your OEM's original drivers , in your case its Dell.
2. Try to Disable ip v6 from VM.
3. Please check Hyper-V Virtual switch settings and make sure VMs assigned to correct VLAN and Virtual switch
4. In the VM Disable any Antivirus program or Windows firewall you may have for temporary purpose.
5. Run Cluster validation wizard to check overall health of the Cluster.
6. Update BIOS firmware and other Drivers using Dell SU.

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