iptables producing 'Unknown error 18446744073709551615' in RHEL 5

Solution Verified - Updated -

Issue

  • Creating a large number of rules such as 50000, iptables will produce "iptables: Unknown error 18446744073709551615".
  • iptables bulk updates (eg: iptables-restore) fails with return code -1
  • Gives the error "kernel: allocation failed: out of vmalloc space - use vmalloc=<size> to increase size" in /var/log/messages

Environment

  • RHEL 5
  • kernel - 2.6.18-128.el5
  • iptables-1.3.5-5.3.el5_4.1

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