Disable IPv6 on Linux

To disable IPv6 on Linux, just type:

root# echo 1 > /proc/sys/net/ipv6/conf/eth0/disable_ipv6

To enable IPv6 on Linux, just type:

root# echo 0 > /proc/sys/net/ipv6/conf/eth0/disable_ipv6

In both cases, remember to replace your interface name.