RHEL 7.6 HyperV (Azure) guest loses network connectivity at boot or after bring the NIC down and up

Solution Verified - Updated -

Issue

  • For a guest running in Hyper-V or an Azure instance, sometimes the hv_netvsc NIC does not function at boot or stops functioning after an ifdown and ifup cycle (restart of the network service).

Environment

  • Red Hat Enterprise Linux RHEL 7.6
  • kernel-3.10.0-957.el7 series
  • Microsoft Hyper-V virtualization
  • Microsoft Azure Cloud

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