The invention provides a message transmission method and device and related equipment, and relates to the technical field of communication, and the method comprises the steps: transmitting an
authentication request message after first packaging
processing to receiving end equipment, so as to enable the receiving end equipment to execute a
user authentication process based on the
authentication request message after first packaging
processing, the
authentication request message comprises a point-to-point protocol message on the
Ethernet and a
network layer data packet, the
network layer data packet comprises a protocol field, and the protocol field is filled with predefined data; after the
user authentication succeeds, determining predefined data filled with a protocol field in a transmission request message based on the transmission request message which is transmitted by the receiving end equipment and is subjected to second encapsulation
processing; and according to predefined data filled in the protocol field, identifying and de-encapsulating the point-to-point protocol message on the
Ethernet in the transmission request message, and continuing to execute the point-to-point protocol flow on the
Ethernet. According to the invention, point-to-point authentication and session-level management and control on the Ethernet can be carried out across a three-layer network.