it's me again :-)
things go better, i can now authenticate my users with NAS-Port-Type and NAS-Identifier attributes.
but there is one more problem : it seems that called-station-id and calling-station-id are not sent by pfsense, users are always refused if i try to authenticate with called-station-id="pfsense wan IP" and calling-station-id is empty in the radacct table.
what gives ?