Enable IPv6 by default #1222

Expected/Desired Behavior:

Mininet VM to be able to use IPv6

Actual Behavior:

Not being able to use it

Detailed Steps to Reproduce the Behavior:

Download the VM and launch it on any virtual manager

Additional Information:

Can be corrected by changing the value of ipv6.disable in /etc/default/grub to 0 and running "sudo update-grub"

But I don't know why it's not by default for a network simulator ?