On modern systems IPV6 protocol enabled by default. And in some situations, it sometimes gets in the way. Therefore, we will tell you how to disable this feature in Debian / Ubuntu systems.
Check that an IPv6 interface is available on the host:
$ ip addr | grep inet6
Output like this:
ip addr | grep inet6
inet6 ::1/128 scope host
inet6 fe80::20c:29ff:fe58:3263/64 scope link
Edit the sysctl.conf file to disable IPv6 support for all interfaces at once:
$ sudo nano /etc/sysctl.conf
Add the following line to the end of confuguration file
# disable IPv6 net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv6.conf.lo.disable_ipv6 = 1
To apply the change in sysctl.conf, you need to run the command:
sudo sysctl –p
On Debian 10/11
$ sudo /sbin/sysctl -p
This will disable IPv6 on system.
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