Knowledgebase

Disable IPv6 on Debian

This article provides a guide demonstrating how to disable IPv6 on Debian servers.

To disable IPv6 on Debian server, follow the steps below:

Edit the configuration file:

sudo nano /etc/sysctl.d/99-disable-ipv6.conf

Add the following lines:

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

Apply the changes:

sudo sysctl -p /etc/sysctl.d/99-disable-ipv6.conf

Verify:

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

should return:

You now know how to disable IPv6 on Debian servers.

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