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How To Disable IPv6 In CentOS 7

Method 1

Edit file /etc/sysctl.conf,

vi /etc/sysctl.conf

Add the following lines:

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

If you want to disable IPV6 for particular network card, for example enp0s3, add the following entry.

net.ipv6.conf.enp0s3.disable_ipv6 = 1

Save and exit the file.

Execute the following command to reflect the changes.

sysctl -p

Method 2:

To IPv6 disable in the running system, enter the following commands one by one:

echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6
echo 1 > /proc/sys/net/ipv6/conf/default/disable_ipv6

or,

sysctl -w net.ipv6.conf.all.disable_ipv6=1
sysctl -w net.ipv6.conf.default.disable_ipv6=1

That’s it. Now IPv6 has been disabled.

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