Tunnel establishment and data transmission processing method and device, and storage medium

The embodiment of the invention provides a tunnel establishment and data transmission processing method and device and a storage medium. In the embodiment of the invention, on one hand, the tunnel supporting the unreliable transmission is improved, and the client is allowed to configure the retransmission times when the tunnel transmits the unreliable data packet, so that the retransmission time is shortened under the condition that the tunnel fails to transmit the unreliable data packet; according to the invention, retransmission processing can be carried out on unreliable data packets which fail in transmission in a tunnel according to retransmission times configured by a client, so that packet loss retransmission is realized on a tunnel link, and the tunnel-based data transmission performance is improved; on the other hand, the tunnel establishment method based on the long and short packet header information is provided, the problem that tunnel messages are discarded or blocked on a tunnel server due to th