Disable IPv6 on Raspberry Raspbian

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Disabling IPv6

Firstly, check for presence of IPv6 using ifconfig. You should be seeing a few lines containing inet6 addr: ....

To disable, edit a file: sudo nano /etc/sysctl.conf

Add the following line:

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net.ipv6.conf.all.disable_ipv6 = 1

For the change to take effect without rebooting:

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sudo sysctl -p

Verify that IPv6 address does not show up in ifconfig.

Re-enabling IPv6

If you wish to re-enable, change the value in the setting above from 1 to 0 then execute the following two lines:

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sudo sysctl -p
sudo ifconfig eth0 down && sudo ifconfig eth0 up

If you are doing this over SSH, the current session will of course be cut off. You should be able to reconnect in just a few seconds.