How to Disable IPV6 in RHEL7/CentOS 7

How to Disable  IPV6 in RHEL7/CentOS 7

1. Un-comment "AddressFamily inet" in /etc/ssh/sshd_config.
2. create new file named /etc/sysctl.d/ipv6.conf.
3. Enter following Information in the file.

# To disable for all interfaces
net.ipv6.conf.all.disable_ipv6 = 1
# the protocol can be disabled for specific interfaces as well.
#net.ipv6.conf.<interface>.disable_ipv6 = 1

4. Reload new settings.
sysctl -p /etc/sysctl.d/ipv6.conf

5. Rebuild initial RAM Disk Image.
dracut -f

6. Reboot the Server to take effect.