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Disable ipv6 on Ubuntu 20.04

How to disable ipv6 on Ubuntu 20.04?

tune

add the following lines into /etc/sysctl.conf

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
sudo sysctl -p

check

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

1

you may also find the inet6 in ifconfig is disappeared.

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