RHEV: VMs lost network connectivity after RHEL Hypervisor upgraded to 6.7

Solution Verified - Updated -

Issue

  • VMs lost network connectivity when migrated to RHEL hypervisors running kernel-2.6.32-573.el6 or later.
  • Migrating VM back to a not upgraded hypervisor simply made it accessible again.
  • DHCP replies/offers are not forwarded to KVM Guest.
  • PXE boot in the KVM guest times out.
  • Hypervisor bridge not forwarding ARP requests to virtual machine vnetX.
  • Virtual Machines can only ping other Virtual Machines running in the same Host.
  • Hosted-Engine can only ping the host it is running on, cannot connect to other Hosts.
  • Server cannot communicated unless NIC is in promiscuous mode

Environment

  • Cisco UCS
  • Red Hat Virtualization 3.4, 3.5, 3.6 and 4.x
  • Red Hat Enterprise Linux 6.7, 6.8 based Hypervisor
    • kernel-2.6.32-573.el6 (and higher)
  • Red Hat Enterprise Linux 7.x based Hypervisor
    • kernel-3.10.0-123.el7 (and higher)
      • driver: enic version 2.1.1.67

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