Disabling IPv6 module from sysctl.conf results in "unknown key" while booting in RHEL 6.

Solution In Progress - Updated -

Issue

  • Disabling IPv6 module from sysctl.conf results in below error while booting.
error: "net.ipv6.conf.default.disable_ipv6" is an unknown key
error: "net.ipv6.conf.all.disable_ipv6" is an unknown key

Environment

  • Red Hat Enterprise Linux 6.5

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