Enable or disable IPv6

This is a reminder on how to either disable or enable IPv6 for troubleshooting purposes.

Disabling:

$ sudo sysctl -w net.ipv6.conf.all.disable_ipv6=1

$ sudo sysctl -w net.ipv6.conf.default.disable_ipv6=1

$ sudo sysctl -w net.ipv6.conf.lo.disable_ipv6=1

Also, in order to make the change permanent add the following lines 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

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To Re-Enable, simply replace 1 with 0:

$ sudo sysctl -w net.ipv6.conf.all.disable_ipv6=0

$ sudo sysctl -w net.ipv6.conf.default.disable_ipv6=0

$ sudo sysctl -w net.ipv6.conf.lo.disable_ipv6=0

 And make the changes to /etc/sysctl.conf as well or simply remove those lines.