ipv6 addressing

[Radu Malica]

Hi

i have 2 ipv6 block addresses from some time now. i have studied ipv6
tunnels. on cisco on linux now i know them perfectly. But in despite of all
RFC related to ipv6 i read, i can't understand how to allocate ipv6
addresses from my block

for example i have 2001:600:4:80cf::/48
and a /64 from sprint 3FFE:2900:E004::/48

and i don't know how to give to my clients ipv6 tunnels and sub block
addresses

could anyone give me a hint?

thanks a lot

Radu Malica