> PS I was not able to search too much on INRIA and on the university of
> Paris (as suggested) for the simple reason that 99% of the pages I found
> are in french.
Eh?
Typing ``X11R6 IPv6 INRIA'' in Google gives the following English page
as the third hit:
http://www.ipv6.org/impl/inria.html
Juliusz