nl6cl allows you instantly to be connected to 6bone via the Native LABS infrastructure.
Native LABS offer free Tunnel Broker IPv6 services.

First of all, register to the website http://www.nativelabs.org/
And please make sure that you have set up device, username and password in the /etc/nl6cl.conf file.
 
nl6cl is free software; you can redistribute it and/or modify it under the terms of the GNU
General Public License as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.See the GNU General Public License for more details.

For more information visit the project's web site at:
http://www.nativelabs.org/downloads/

have fun!