RHEL: TCP sockets are gone but nf_conntrack entry remains

Solution In Progress - Updated -

Issue

  • The nf_conntrack table is getting filled and “kernel: nf_conntrack: table full" messages are observed in /var/log/messages.
  • Because of this, call drops are observed – It was recovered by performing node switch over. But still net.netfilter.nf_conntrack_count is still increasing at high rate.

Environment

  • Red Hat Enterprise Linux
    • RHEL6 and RHEL7
  • nf_conntrack
  • Ipv4 or Ipv6
  • TCP

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