Method for dynamically penetrating interior of local area network

Abstract

The invention provides a method for dynamically penetrating the interior of a local area network. The method comprises the following steps: a client and server structure is established between a client and a public network IP server by using intranet equipment in the local area network; the intranet device and the public network IP server establish TCP connection through a private protocol, and establish a management plane channel; when reverse data penetration is needed, the public network IP server notifies the intranet equipment to establish a PPTP tunnel, namely a data plane tunnel, through the management plane channel; the intranet equipment establishes a PPTP tunnel with a public network IP server; the public network IP server communicates with the intranet equipment through the established PPTP tunnel; and when the service is stopped, the intranet equipment and the public network IP server clear the routing configuration of the PPTP tunnel. According to the method, the C/S architecture is established, the tunnel connection is dynamically established, resources are distributed as required to realize local area network intranet penetration, and the method can be suitable for equipment with weak edge computing capability.

Description

technical field [0001] The invention relates to the technical field of internal and external network communication, in particular to a method for internal dynamic penetration of a local area network, which is suitable for stable reverse access of Internet of Things network devices. Background technique [0002] In the prior art, data transmission is performed between the internal network and the external network through a NAT gateway. The specific transmission process is as follows: figure 1 As shown, a mapping table needs to be configured on the NAT gateway in advance. The table records the mapping that the request received by the gateway is forwarded to the intranet server. Then, if a host on the public network initiates a request to the intranet device, the NAT gateway will Modify the destination IP address and destination port of the data packet according to the contents of the mapping table. Finally, the modified data packet is sent to the requested target host, and af...

AI Technical Summary

Problems solved by technology

[0004] (1) It needs to be configured in advance. Once the network environment changes, you need to log in to the NAT device to make changes;

[0005] (2) The port needs to be planned in advance and the number of ports is limited. Once the port is used up, it will not be able to support new intranet devices;

[0007] (4) When the NAT gateway device is also in the intranet environment, it cannot provide services;

[0008] (5) Only supports TCP and UDP services

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