Cyber Militia

You can get IPv6 connectivity using a tunnel, if you don’t have native IPv6 support.
Doing this is pretty straightforward if you have a dedicated server or a KVM VPS.

However, with an OpenVZ VPS, things are a little different.

Here’s how you can get IPv6 working on a OpenVZ VPS with a tunnel – Tutorial for Debian (tested on wheezy).

1. Create a tunnel at tunnelbroker.net
   Hurricane Electric allows creation of up to 5 free IPv6 tunnels @ tunnelbroker.net. Create one for your VPS.
2. Enable TUN/TAP on your VPS.
   It should normally be possible to do this through your control panel (e.g., SolusVM). If not, a support ticket with your provider should get it done fairly quickly. Be advised that toggling this option forces a reboot. So plan accordingly.
3. Get tb-tun
   tb-tun is a userspace program that utilizes TUN/TAP to build a tunnelbroker tunnel on linux. Since we can't do it any other way on a OpenVZ VPS.

   apt-get install iproute gcc
   cd /root
   wget https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/tb-tun/tb-tun_r18.tar.gz
   tar -xf tb-tun_r18.tar.gz
   gcc tb_userspace.c -l pthread -o tb_userspace
   chmod 0777 /root/tb_userspace

4. Create a new init script
   

   nano /etc/init.d/ipv6tb

   and put in the following contents (after replacing the correct IP addresses, of course) Remember, for the tunnel, your VPS IP is the client and the Hurricane Electric IP is the server.

   #! /bin/sh
   
   ### BEGIN INIT INFO
   # Provides:          ipv6
   # Required-Start:    $local_fs $all
   # Required-Stop:     $local_fs $network
   # Default-Start:     2 3 4 5
   # Default-Stop:      0 1 6
   # Short-Description: starts the ipv6 tunnel 
   # Description:       ipv6 tunnel start-stop-daemon
   ### END INIT INFO
   
   # /etc/init.d/ipv6tb
   
   touch /var/lock/ipv6tb
   
   case "$1" in
     start)
       echo "Starting ipv6tb"
         setsid /root/tb_userspace tb [Server IPv4 Address] [Client IPv4 Address] sit > /dev/null 2>&1 &
         sleep 3s #ugly, but doesn't seem to work at startup otherwise
         ifconfig tb up
         ifconfig tb inet6 add [Client IPv6 Address from your Routed /64]::XXX/128 #Add as many of these as you need from your routed /64 allocation
         ifconfig tb mtu 1480
         route -A inet6 add ::/0 dev tb
         route -A inet6 del ::/0 dev venet0
       ;;
     stop)
       echo "Stopping ipv6tb"
         ifconfig tb down
         route -A inet6 del ::/0 dev tb
         killall tb_userspace
       ;;
     *)
       echo "Usage: /etc/init.d/ipv6tb {start|stop}"
       exit 1
       ;;
   esac
   
   exit 0

5. Make it executable, and add it to startup
   

   chmod 0755 /etc/init.d/ipv6tb
   update-rc.d ipv6tb defaults

6. Execute it right away
   

   /etc/init.d/ipv6tb start

   OR simply reboot.
7. Test to confirm that IPv6 connectivity is working
   

   ping6 -c 5 google.com