How do i disable IPv6 on CentOS 7 / RHEL 7

CentOS 7
This is mini how to on disabling ipv6 on CentOS 7 / RHEL 7, it can be disabled either by using sysctl.conf or by placing conf in the /etc/sysctl.d directory. CentOS 7 now supports disabling IPv6 for all or particular network adapter.

Method 1:

Edit the /etc/sysctl.conf.

# vi /etc/sysctl.conf

Put the following entry to disable IPv6 for all adapter.

net.ipv6.conf.all.disable_ipv6 = 1

For particular adapter. (If the network card name is eno16777736).

net.ipv6.conf.eno16777736.disable_ipv6 = 1

To reflect the changes by executing the following command.

# sysctl -p

Method 2:

Create file called disableipv6.conf in /etc/sysctl.d.

# vi /etc/sysctl.d/disableipv6.conf

Put the following entry to disable IPv6 for all adapter

net.ipv6.conf.all.disable_ipv6 = 1

For particular adapter. (If the network card name is eno16777736).

net.ipv6.conf.eno16777736.disable_ipv6 = 1

You must reboot the server to take an effect of the changes.

# reboot

That’s All.

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  • Guillaume Morin

    You could also use this instead of rebooting :

    sysctl -p /etc/sysctl.d/disableipv6.conf

  • Kitty

    For an on-the-fly change you can do:

    echo “1” > /proc/sys/net/ipv6/conf/all/disable_ipv6

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