A method of transmitting data between a first communication device and a second communication device, the first communication device being configured to receive from a router connected to the first communication device (LSR-EC1) data in the form of packets comprising at least one intermediate level tag, the method comprising at least: a) an initial step of connection setup, comprising at least: - a1) a sub-step of transmitting, by the first communication equipment to the second communication equipment, the intermediate level tag; - a2) a sub-step of recording, by the first communication equipment, the intermediate level tag; b) a step of transmitting the data packet, comprising: - b1) a sub-step of deleting, by the first communication equipment, the intermediate level tag transmitted by the router connected to the first communication equipment (LSR-EC1) in the data packet, to form a decapsulated data packet; - b2) a sub-step of transmitting, by the first communication equipment to the second communication equipment, the decapsulated data packet, with a view to being reconstructed after its transmission in the form of a reconstructed data packet including the decapsulated data packet and the recorded intermediate-level tag; - b3) a sub-step of comparing, by the first communication equipment, the intermediate level tag received from the router connected to the first communication equipment (LSR-EC1) with the intermediate level tag recorded in the first communication equipment; characterized in that step b) of transmitting the data packet further comprises: - b4) in the event of a difference between the intermediate level tag received from the router connected to the first communication equipment (LSR-EC1) and the intermediate level tag recorded in the first communication equipment, a sub-step of adding, by the first communication equipment, a signaling header (L2-ext) in the decapsulated data packet to be transmitted to the second communication equipment, and a sub-step of updating the intermediate level tag recorded from the data contained in the signaling header (L2-ext). a) an initial step of connection setup, comprising at least: - a1) a sub-step of transmitting, by the first communication equipment to the second communication equipment, the intermediate level tag; - a2) a sub-step of recording, by the first communication equipment, the intermediate level tag; - a1) a sub-step of transmitting, by the first communication equipment to the second communication equipment, the intermediate level tag; - a2) a sub-step of recording, by the first communication equipment, the intermediate level tag; b) a step of transmitting the data packet, comprising: - b1) a sub-step of deleting, by the first communication equipment, the intermediate level tag transmitted by the router connected to the first communication equipment (LSR-EC1) in the data packet, to form a decapsulated data packet; - b2) a sub-step of transmitting, by the first communication equipment to the second communication equipment, the decapsulated data packet, with a view to being reconstructed after its transmission in the form of a reconstructed data packet including the decapsulated data packet and the recorded intermediate-level tag; - b3) a sub-step of comparing, by the first communication equipment, the intermediate level tag received from the router connected to the first communication equipment (LSR-EC1) with the intermediate level tag recorded in the first communication equipment; characterized in that step b) of transmitting the data packet further comprises: - b4) in the event of a difference between the intermediate level tag received from the router connected to the first communication equipment (LSR-EC1) and the intermediate level tag recorded in the first communication equipment, a sub-step of adding, by the first communication equipment, a signaling header (L2-ext) in the decapsulated data packet to be transmitted to the second communication equipment, and a sub-step of updating the intermediate level tag recorded from the data contained in the signaling header (L2-ext). - b1) a sub-step of deleting, by the first communication equipment, the intermediate level tag transmitted by the router connected to the first communication equipment (LSR-EC1) in the data packet, to form a decapsulated data packet; - b2) a sub-step of transmitting, by the first communication equipment to the second communication equipment, the decapsulated data packet, with a view to being reconstructed after its transmission in the form of a reconstructed data packet including the decapsulated data packet and the recorded intermediate-level tag; - b3) a sub-step of comparing, by the first communication equipment, the intermediate level tag received from the router connected to the first communication equipment (LSR-EC1) with the intermediate level tag recorded in the first communication equipment; - b4) in the event of a difference between the intermediate level tag received from the router connected to the first communication equipment (LSR-EC1) and the intermediate level tag recorded in the first communication equipment, a sub-step of adding, by the first communication equipment, a signaling header (L2-ext) in the decapsulated data packet to be transmitted to the second communication equipment, and a sub-step of updating the intermediate level tag recorded from the data contained in the signaling header (L2-ext).