NAT (network address translation) type based device intercommunication method and system

An intercommunication system and type of technology, applied in the network field, can solve problems such as unsuccessful access

Active Publication Date: 2014-12-24
ZHEJIANG UNIVIEW TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When users want to access the camera, sometimes the access will be unsuccessful due to the complexity of the NAT types they access and the changes in IP addresses and ports.

Method used

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  • NAT (network address translation) type based device intercommunication method and system
  • NAT (network address translation) type based device intercommunication method and system
  • NAT (network address translation) type based device intercommunication method and system

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0016] There are different types of NAT devices, "Full Cone NAT", "Restricted Cone NAT", "Port Restricted Cone NAT" and "Symmetric NAT".

[0017] "Full Cone NAT": The intranet host establishes a UDP socket (LocalIP:LocalPort). When using this socket to send data to an external host for the first time, NAT will assign it a public network (PublicIP:PublicPort). This socket will be used later Sending data to any host outside will use this pair (PublicIP:PublicPort). In addition, any external host can send data to (PublicIP:PublicPort) as long as it knows this (PublicIP:PublicPort), and the host on the internal network can receive this data packet.

[0018] "Restricted Cone NAT": The intranet host establishes a UDP socket (LocalIP:LocalPort). When using this socket to send data to the external host for the first time, NAT will assign it a public network (PublicIP:PublicPort). Any host outside sending data will use this pair (PublicIP:PublicPort). In addition, if any external hos...

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Abstract

The invention provides an NAT (network address translation) type based device intercommunication method. The method includes that a server in a public network transmits a message for acquiring the type of a first NAT device to a first service device in the first NAT device, and the first service device feeds back the type of the first NAT device to the server; the server transmits a message for acquiring the type of a second NAT device to a second service device in the second NAT device, and the second service device feeds back the type of the second NAT device to the server; the server judges whether to set the types of the NAT devices or not according to the acquired types of the first NAT device and the second NAT device; if yes, the messages for setting the NAT types are transmitted; if not, the messages for setting the NAT types are not transmitted; the corresponding NAT devices perform resetting of the NAT types according to the set messages. By the method, devices behind the devices of the NAT types quite high in security can mutually intercommunicate with devices behind the other devices of the NAT types quite high in security.

Description

technical field [0001] The present invention relates to the field of network technology, in particular to a method and system for device intercommunication based on NAT type. Background technique [0002] A complete video surveillance system is composed of 5 parts: camera, transmission, control, display and storage. Please refer to figure 1 , this patent application mainly relates to the transmission part. [0003] As we all know, with the promotion and popularization of IP monitoring technology and Internet technology, branches of cross-regional departments and global branches of business groups are increasingly using remote Internet video surveillance. However, in actual use, the user display device and the surveillance camera are usually located in an intranet constructed by different NAT routers. User display devices and surveillance cameras access the Internet through different NAT routers in the intranet. When the user wants to access the camera, sometimes the acce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/12H04L29/06
Inventor 周迪关春天
Owner ZHEJIANG UNIVIEW TECH CO LTD
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