Device and method for telecommunicating between customer end application component and object server

Abstract

The invention is designed for use in a communication system having a relay device between the client side and destination server. The system thereof comprises a relay unit located at the client side and a relay server located at server side. A dedicated channel is set between the relay unit and relay server; the dedicated channel and the internal protocol traversing relay device are used to make communication; the relay unit and relay server are used to build the logical channel between the port of the main application component and the port of the destination server; the logical channel is build on said dedicated channel; the main application component and the destination server make normal communication that can traverse the relay device.

Description

technical field [0001] The invention relates to network information interaction technology, in particular to a device and method for successfully realizing information interaction between a client and a server when forwarding equipment is introduced between a private network where a client is located and a public network where a server is located. Background technique [0002] With the rapid development of the Internet (Internet), various emerging Internet applications emerge in endlessly, the Internet business volume is increasing rapidly, IP address resources are becoming more and more tense, and network security issues are becoming more and more prominent. In order to solve the increasingly scarce IP address resources and improve the security of enterprise networks, many enterprises and institutions or MANs indirectly access the Internet by using forwarding devices, such as network address translation (NAT) devices / proxy servers / firewalls. [0003] However, currently some...

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Problems solved by technology

[0007] 4. The communication protocols used are relatively complex. For example, the communication protocols commonly used in these applications include: H.323, SIP, MGCP, H.248 / MECAGO and other complex protocols, and the forwarding equipment generally does not support such complex protocols. protocol, which may prevent end-to-end communication between the main application component and the target server

[0009] 6. The network environment where the application is located is diversified, and the network settings are not allowed or difficult to change;

[0010] 7. The target server is relatively fixed and directly on the Internet;

The message sent by the main application part of the client to the target server first reaches the NAT / proxy server, and the NAT / proxy server converts the source IP address and port in the message header to the IP address and port of the NAT and then sends it to the target server ;According to the requirements of the protocol with feature 4, the target server parses out the source IP address and port from the data part of the message, and returns a response message to the source IP address and port; however, the source IP and port included in the data part are not on the public network The IP address and port of the client, but the IP address and port of the client's private network, so the returned response message cannot be routed to the correct destination IP address and port, so it cannot reach the main application component of the client, resulting in communication failure

[0015] In addition, if the forwarding device is a proxy server, the protocol adopted by the above-mentioned main application component is a protocol that requires end-to-end communication, and does not support the proxy protocol that interacts through the proxy server, so the main application component of the client cannot communicate with the proxy server. It is even more impossible to communicate with the target server through the proxy server

[0016] In addition, the above three forwarding devices will prevent the communication process initiated from the public network to the private network

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