ip_conntrack or nf_conntrack : table full, dropping packet

Solution Verified - Updated -


  • What do the following messages in the system log mean?
ip_conntrack: table full, dropping packet.
nf_conntrack: table full, dropping packet.
  • Packet drops on this system for connections using ip_conntrack or nf_conntrack iptables modules.
  • Messages seen in /var/log/messages on the compute nodes when one of the instances drops packets
  • How do I increase the nf_conntrack_max?
  • How to Increase the number of simultaneous/concurrent TCP connections through the nftables firewall?


  • Red Hat Enterprise Linux 4 and later
  • Linux kernel netfilter-based firewall with connection tracking (iptables, firewalld, nftables, etc)

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