Realizing method for preventing point-to point protocol recognization from being attacked in wideband cut-in network

This invention is a kind of point-to-point protocol identification attacking prevention method in the board-band network. This invention overcomes the question that current techniques do not have effective means to restrain PPP identification attacking. It can automatically identify PPP identification attacked users and filter the attacking messages. It avoids that the illegal internet-accessing process uses identification messages to attack BRAS devices and identification server.