Why does the multicast traffic among virtual machines quit working?

Solution Verified - Updated -

Issue

  • Why does the multicast traffic among virtual machines quit working after upgrade to RHEL 6.5?
  • In a virtualized environment based on KVM hypervisor the flow of multicast traffic between the Virtual Machines stops after a constant amount of time.
  • Multicast traffic fails to reach the intended destinations after a fixed time has passed.
  • Multicast packets can not be received on the guest from other guests

Environment

  • Red Hat Enterprise Linux 6.5
  • Red Hat Enterprise Linux 5.9 onwards
  • KVM virtualization or Red Hat Enterprise Virtualization
  • Bridged virtual machine network interfaces
  • Multicast traffic between guests

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