Method, system and relay device for transmitting packet

摘要

A method, system and relay device for transmitting a packet. The method includes: receiving an upstream packet carrying an original user identifier of a user; establishing a corresponding relationship between user related information on the user and a replacement user identifier in accordance with the upstream packet carrying the original user identifier of the user, and sending an upstream packet carrying the replacement user identifier of the user to a server, the replacement user identifier being capable of distinguishing the user from others; determining the user related information corresponding to the replacement user identifier in the downstream packet in accordance with the corresponding relationship, and transmitting the downstream packet in accordance with the user related information. Therefore, a Client can be located in accordance with a received downstream packet in the case that one original user identifier being capable of identifying the Client conflicts with another.