The freenet6.lrp package provides tspc - tunnel setup protocol client - used by the ipv6 tunnel broker freenet6 to give you access to 6bone. It will allow you to connect to 6bone with an ipv6 address for your LEAF router or a complete ipv6 subnet for your network. It will also setup a tunnel from your LEAF router to the ipv6 network. This works with fixed as well as with dynamic ipv4 addresses (Dial-up links, ADSL links etc...)

tspc has been outlined in the Internet draft draft-vg-ngtrans-tsp-01, another explanation and test of this approach can be found here.

A very good introduction, setup instruction for Debian packages and recommended reading is available from Jean Marc Liotier - Jim's insignificant LAN IPv6 global connectivity HOWTO. Because we just adapted the Debian package for LEAF Bering-uClibc, almost everything fit's to the freenet6.lrp as well.