How to Enable/Disable IPv6 in Linux Machine?

Enable IPV6 : 

Step 1:

                 Add the below entry in the modprobe.conf file

      # vi /etc/modprobe.conf

      alias net-pf-10 ipv6

Note : Remove if any entry like “alias net-pf-10 off or alias ipv6 off or options ipv6 disable=1” in the modprobe.conf file.

Step 2:

                 Change the “ NETWORKING_IPV6” parameter value to yes in the network file.

      # vi /etc/sysconfig/network

      NETWORKING_IPV6=yes

Step 3:

                 Restart the server to enable the IPV6 support

            # shutdown -r now

Disable IPV6:

Step 1: 
           Add the below line in the modprobe.conf file

            # vi /etc/modprobe.conf

            alias net-pf-10 off

            alias ipv6 off                   

            options ipv6 disable=1    

Note : If any entry available like “alias net-pf-10 ipv6”, delete that entry.

             Step 2:     

                 Also add the below entry in the network file to prevent error

            # vi /etc/sysconfig/network

            NETWORKING_IPV6=no 
Step 3:        

                             Reboot the server to disable the IPV6

      # shutdown -r now