fec0 is an site-local address( scope: site) so we use this only for asking a prefix from server( it likes 0.0.0.0 in IPv4). I think that Radvd accepts only the prefix with scope global. Try another prefix like 3ffe,5f or 2002(6to4). Cheers _________________________________________________________ Le journal des abonnés Caramail - http://www.carazine.com