IPV6 off permanently

Discussion in 'all things UNIX' started by Palancar, Oct 13, 2014.

  1. Palancar

    Palancar Registered Member

    Joined:
    Oct 26, 2011
    Posts:
    1,599
    I am experimenting running some VM's with ipv6 fully disabled in 14.04. Nothing magic but I have no current use for 6 and considering security I figured I would disable it until/unless at some future time I need it.

    I used a procedure described over at ubuntu forums:

    To disable ipv6 open /etc/sysctl.conf using any text editor, insert the following lines at the end.

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

    If still ipv6 not disabled, then the problem is sysctl.conf still not activated, to solve it you can do the following,

    Open terminal(Ctrl+Alt+T) and type the following command,

    sudo sysctl -p

    You will get result in terminal as,

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

    After that if you check,

    $ cat /proc/sys/net/ipv6/conf/all/disable_ipv6

    You will get result as,

    1

    If you get result as 1, ipv6 disabled successfully.

    **This was of course really easy to do. I was wondering if there have been any investigations of ways that ipv6 could be maliciously turned backed on remotely? I am still going to leave my firewall imposing blocks on ipv6.