Method and device for achieving gateway NAPT function based on middleware

Abstract

The embodiment of the invention provides a method and device for achieving a gateway NAPT function based on middleware. The method comprises the steps that a data package is obtained by the middleware; if the data package is an IP data package and the IP data package carries TCP messages or UDP messages, the middleware is used for inquiring an NAPT table; if the corresponding relation of a source IP and a source port number does not exist in the NAPT table, the middleware is used for modifying the source IP and the source port number in the IP data package respectively, and the source IP, the source port number, the modified source IP and the modified source port number are stored in the NAPT table. According to the embodiment of the method and device for achieving the gateway NAPT function based on the middleware, the NAPT function is achieved through the middleware, and compared with the mode that the NAPT function is achieved in a kernel state and under bottom driving, the coupling degree is lowered; compared with the mode that the NAPT function is achieved in a user state, the middleware has good function expandability, and the NAPT function can be adjusted.

Description

technical field [0001] Embodiments of the present invention relate to communication technologies, and in particular to a method and device for implementing a gateway NAPT function based on middleware. Background technique [0002] Network Address Port Translation (NAPT for short) is a translation technology that maps multiple private internal IP addresses to a legal public IP address, that is, <internal address + internal port> and <external address + external port > conversion between. The access gateway device generally has this NAPT function, which is used for the interconnection and intercommunication between the LAN and the WAN. [0003] Existing methods for realizing the NAPT function are mainly divided into three categories: one is to modify the protocol stack of the operating system in the kernel mode to realize the NAPT function, which has the advantages of fast processing speed and high reliability; the other is to implement the NAPT function in the us...

AI Technical Summary

Problems solved by technology

The defect of the first and third methods is that the NAPT function is highly coupled with the operating system and the underlying driver. The defect of the second method is that the NAPT function has poor scalability.

[0004] In the prior art, there is a lack of a middleware-based method for realizing the gateway NAPT function that can overcome the deficiencies of the NAPT function in the kernel mode, the user mode, and the underlying driver at the same time

Images