Configure IPv6 tunnel on Ubuntu

Having trouble configuring IPv6 tunnel on Ubuntu. Follow these 10 simple steps below to configure IPv6 tunnel on Ubuntu easily.

Step 1: First signup with a free account on gogo6.


Step 2: Get free freenet6 tunnel from here (gogo6 account required from step 1). You will receive a username and password in your email box from this step. These will be your tunnel username and password. These will be used in step 4.


Step 3: Install gogoc and Router Advertisement Daemon from Ubuntu Software Center.


Step 4: Now edit /etc/gogoc/gogoc.conf in your favorite text editor. Super User or root privileges are required.

• Open terminal: ctrl+alt+t .

• Run this command:  sudo gedit /etc/gogoc/gogoc.conf

• Run ifconfig command in new terminal window [ctrl+alt+t] and get interface name. Usually it is eth0 for wired and wlan0 for wireless connection.

• Edit the following fields:

userid= #tunnel user id from step 2
passwd= #tunnel password from step 2
server=montreal.freenet6.net or amsterdam.freenet6.net
auth_method=any
host_type=router
if_prefix=eth0   #run command "ifconfig" to check its correct value, usually its eth0 or eth1 for ethernet and wlan0 or wlan1 for wireless lan.
dns_server=2001:4860:4860::8888
tunnel_mode=v6anyv4
log_console=0
log_stderr=1
log_file=1
log_syslog=0
log_filename=/var/log/gogoc/gogoc.log

Leave the rest fields to their default. Save the file [ctrl+s] and close.

For Sever use montreal if tunnel endpoint you choose in step 2 is montreal then it becomes montreal.freenet6.net or use the naked IPv4 address (64.86.88.116) of montreal server.

Step 5: Open terminal and check that gogo6 service is running or not.

• To start gogo6: sudo service gogoc start 

• To restart: sudo service gogoc restart 

• To Stop: sudo service gogoc stop

• After a proper start or restart you will see [OK] in terminal.

-->

This command will be helpful if you face any key related problem in gogoc :

sudo /usr/sbin/gogoc -n

Input Yes when it asks and press ctrl+c to end after a minute.


Step 6: Now open the gogo6 log file /var/log/gogoc/gogoc.log . If you are successfully connected then you will see:

Your IPv6 address is 2gge:0ty0:1000:000b:0000:0000:0000:gfgf
Your IPv6 prefix is 2gge:0ty0:1rr6:ty00:0000:0000:0000:0000/56
Your IPv6 DNS address is 2001:4860:4860:0000:0000:0000:0000:8888


These address will be different in your gogoc log file. Computer now have its own global IPv6 address.

If you see finished at the end of gogo6 log file then it means gogo6 tunnel is disconnected and repeat step 5. If problem persist then check userid and password are correct and are from step 2.


Step 7: Create if does not exist and edit /etc/radvd.conf , Similar to step 4. Replace its contents with

interface eth0
{
   AdvSendAdvert on;
   prefix 2gge:0ty0:1rr6:ty00:0000:0000:0000:0000/56
   {
        AdvOnLink on;
        AdvAutonomous on;
   };
};

Replace the prefix value in above lines with the prefix value that your computer get from gogo6. Its in log file at /var/log/gogoc/gogoc.log. 

Restart Radvd Service: sudo service radvd restart.


Enable IPv6 routing: Edit the sysctl.conf to enable IPv6 routing with the following command.

sudo gedit /etc/sysctl.conf

Un-comment the following line / Remove hash from the start of the following line:

net.ipv6.conf.default.forwarding=1

Step  8: Reset network connection (disconnect and connect) or restart computer. Wait few seconds and IPv6 tunnel will connect itself. View Connection Information to check IPv6 address.

Step 9 (optional): Sometimes tunnel will take too much time to reconnect. To avoid this you can change the following fields in gogoc configration file at /etc/gogoc/gogoc.conf

auto_retry_connect=yes
retry_delay=5
retry_delay_max=30

You can repeat step 5 to check gogoc is running or not.

Step 10: You are required to add IPv6 DNS server address manually. To add IPv6 DNS server:

Edit Network Connections

Change method to "Automatic, address only" and add the Google IPv6 DNS server address.

After saving settings and resetting network, Connection Information will show this.

+ Point: With this setup you can make free calls to USA and Canada. Check out Google Voice in your Gmail.

Now Google my ip to get to now your IPv6 or Test IPv6. The tunnel will break if the network connection is reset. Gogoc tunnel will reconnect if not then restart it manually. If you want to force IPv6 over IPv4 than visit this blog article.

Raspberry Pi IPv6 tunnel and creating IPv6 home network instructions here and its the most reliable way.