A method and nat equipment for traversing two levels of nat
A technology for equipment and equipment determination, applied in the field of communication, can solve the problems of increasing technical complexity and additional cost, and achieve the effect of avoiding the increase of technical complexity and additional cost.
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Embodiment 1
[0021] See attached figure 2 , the figure shows an embodiment of a method for traversing two-level NAT provided by the present invention, that is, Embodiment 1. This embodiment is applied to a networking environment with two-level NAT devices. In this embodiment, the first-level NAT device is connected to the service provider of the private network to form a first-level NAT network. The first-level NAT device can simultaneously Connect with a plurality of other NAT devices respectively, wherein, every other NAT device can form a NAT network with this first level NAT device, in this embodiment, this NAT network can be understood as, a NAT device needs When converting the IP address in the data packet sent by another NAT device or service provider or service demand end, the local network formed, that is to say, the first-level NAT device can communicate with multiple other NAT devices at the same time. The device constitutes multiple NAT networks of the same level, wherein the...
Embodiment 2
[0056] The above-mentioned embodiments have introduced the technical solution of the present invention, but in order to understand the technical content of the present invention more clearly, a relatively simple two-level NAT device networking environment is taken as an example for illustration below. See attached image 3 As shown, the figure shows an application scenario of implementing NAT device traversal in a two-level NAT device networking environment, and this method constitutes the second embodiment of the present invention. In this embodiment, the first-level NAT device is a home gateway, which is connected to the PC of the home user, and the second-level NAT device is a CGN device (Carrier-grade NAT, operator-level NAT), and the CGN device is connected to the external Subjects are connected. The home user starts the WEB service application on the PC (service provider) in the private network, and the external host located in the external network (public network) acts...
Embodiment 3
[0063] The technical solution of the present invention will be described below with a specific example, which constitutes Embodiment 3 of the present invention, and this embodiment is applicable to the implementation of P2P protocol software in the network after the first-level NAT networking is upgraded to a two-level NAT networking. application.
[0064] At present, P2P software is widely used. Common downloading tools such as "BT" and "EDonkey" all belong to P2P software. An important feature of this type of software is its fast download speed. All user devices can provide "re-download" as a "server", that is to say, when a user downloads a file, it also provides other users to download from their own device. From the perspective of the user who is downloading, on the one hand, he is a "user" who downloads from many "servers" (each user device participating in the download can be regarded as a server); on the other hand, he is also another user. A "server" while downloadin...
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