Openshift: dropped packets over vxlan due to nf_conntrack race condition

Solution Verified - Updated -

Issue

  • 200ms delay and TCP retransmits seen in Openshift environment when POD is transmitting to another node
  • A slight delay is sometimes experienced when connecting to a POD over TCP or when it services some app-level request.
  • Dropped UDP packets when sending UDP packets over vxlan.

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat OpenShift

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