Disable IPv6 in Ubuntu

Good when you don`t know much about stuff and don`t know how to configure IPv6 firewall.

Edit /etc/sysctl.conf

Paste to the end:

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

Run sysctl -p

After that if you check,

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

You will get result as,

1

If you get result as 1, ipv6 disabled successfully.