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• Edit /etc/sysctl.conf and add the following lines at the bottom:

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1

•  Reconfigure kernel runtime paramaters using the command sysctl -p
• Verify it worked
• cat /proc/sys/net/ipv6/conf/all/disable_ipv6 (should return a value of "1")
• ifconfig -a (the IPv6 addresses should be gone)