Method, system and device for controlling address mapping state of equipment

Abstract

The invention discloses a method, a system and a device for controlling the address mapping state of equipment. Main technical scheme is that: the method comprises the following steps that: the equipment with a port control protocol (PCP) server function receives a first PCP request message which is transmitted through a PCP client in a network address translation (NAT) Pinhole creation stage from first equipment, and determines second equipment indicated by second equipment indication information in the first PCP request message; and the equipment establishes an address mapping state corresponding to the second equipment, and sets the life time of the established address mapping state to be equal to that of an address mapping state which corresponds to the first equipment and is established according to the first PCP request message. According to the technical scheme, the life time of the address mapping state corresponding to the second equipment can be set to be equal to that of the address mapping state corresponding to the first equipment, so that the problem of connection interruption caused by the release of the address mapping state of a party in a communication session is solved, and the interruption rate of the communication session is lowered.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method, system and device for controlling the address mapping state of equipment. Background technique [0002] With the advent of the 3G service era, the types of services used by users are more abundant, and the service requirements of users are also developing in the direction of individualization and diversification, and the number of users is also showing a trend of rapid development. In order to meet the needs of many users for addresses, Network Address Translation (NAT, Network Address Translation) or Firewall (FW, FireWall) devices are currently widely deployed in networks to implement communication in different types of networks. On this basis, in order to improve user service experience, the Port Control Protocol (PCP, Port Control Protocol) proposes a set of mechanisms for users to manage and control the NAT capability of the device. [0003] PCP con...

AI Technical Summary

Problems solved by technology

[0010] In the above scenario 1, it is assumed that the lifetime of the address mapping state maintained by the home server on the NAT or FW device is T1, and the lifetime of the address mapping state maintained by the host (Remote host) on the public network on the NAT or FW device is T1. Time T2, in the case of T1>T2, when the NAT or FW device does not receive the data sent by the remote host within the T2 period, its address mapping status will be deleted. In this case, when the NAT or FW device receives the data When a remote host initiates a data request, the address of the remote host may be mapped to a different private network address, resulting in the interruption of the TCP connection between the home server and the remote host

[0011] In Scenario 2, because the PCP process only prolongs the survival time of the address mapping state maintained by the internal host's address on the NAT or FW device, it cannot control the address mapping state of the remote host. Therefore, it still faces the above-mentioned Scenario 1 same problem

[0012] To sum up, based on the existing PCP mechanism for maintaining the address mapping state on NAT or FW devices, there is a problem that the connection is interrupted due to the release of the address mapping state of one party in the communication session, which makes the interruption rate of the communication session higher

Images