Zach Burlingame
Programming, Computers, and Other Notes on Technology

HOWTO: Disable IPv6 in Ubuntu Linux

Although we are edging closer to wide-spread IPv6 adoption with milestones such as World IPv6 Day, we aren’t quite there yet. Since I don’t use IPv6 on my LAN, I prefer to disable it. These instructions were written with Ubuntu 11.04, but it should work for 9.x,10.x, and probably many other distros as well.

Check if IPv6 is enabled

cat /proc/sys/net/ipv6/conf/all/disable_ipv6

0 means IPv6 is Enabled while 1 indicates that IPv6 is Disabled

Disable IPv6

Add the following to /etc/sysctl.conf

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

Reboot!

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