Why messages like 'nf_conntrack: table full, dropping packet.' are seen in logs and how to stop them from occuring ?

Solution Verified - Updated -

Issue

  • What do the following messages in the Red Hat Enterpriss Linux 6 system log mean?
nf_conntrack: table full, dropping packet.
  • Packet drops on this system for connections using nf_conntrack iptables connection tracking
  • How do I increase the nf_conntrack_max in RHEL6?

Environment

  • Red Hat Enterprise Linux 6
  • iptables firewall with connection tracking

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