bonjour,
tu peux aller voir ici :
http://adsl.cutw.net/dsl.html
mais effectivement, à la lecture de la RFC , il est indiqué:
5. Discovery Stage
There are four steps to the Discovery stage. When it completes, both
peers know the PPPoE SESSION_ID and the peer's Ethernet address,
which together define the PPPoE session uniquely. The steps consist
of the Host broadcasting an Initiation packet, one or more Access
Concentrators sending Offer packets, the Host sending a unicast
Session Request packet and the selected Access Concentrator sending a
Confirmation packet. When the Host receives the Confirmation packet,
it may proceed to the PPP Session Stage. When the Access
Concentrator sends the Confirmation packet, it may proceed to the PPP
Session Stage.
pour t'en sortir, tu dois mettre en place un broadcast helper te permettant de relayer les requetes broadcast à travers ton routeur