Network transmission method and system for multi-layer network address translator structure

Abstract

A peer-to-peer server sends a first internal internet protocol (IP) address and a first internal port number of a first node to a second node, and sends a second internal IP address and a second internal port number of the second node to the first node. The first node sends a first packet to the second internal IP address and the second internal port number via a network address translator. The network address translator send a second packet corresponding to the first packet from an intermediary IP address and an intermediary port number to the second node. The second node sends a third packet to the intermediary IP address and the intermediary port number. The network address translator performs a lookup operation to send a fourth packet corresponding to the third packet to the first internal IP address and the first internal port number.

Description

technical field [0001] The present invention relates to a network transmission method and a network transmission system, more specifically, a network transmission method and a network transmission system applicable to a multi-layer network address translator architecture. Background technique [0002] With the development of network technology, peer-to-peer connection has been widely used. Point-to-point connection can allow multiple network nodes to connect to each other without relaying through the server. Transfer and exchange data. However, when the network nodes are located under a multi-level network address translator (NAT) architecture, it is often difficult to successfully establish a point-to-point connection between network nodes. figure 1 It is a structural schematic diagram of the failure in establishment of a point-to-point connection caused by two network nodes located in a multi-level network address translator in the prior art. The network node 112 and the...

AI Technical Summary

Problems solved by technology

When the point-to-point server 110 arranges the network node 111 and the network node 112 to carry out point-to-point connection, if it is desired to use the network node 111 and the network node 112 corresponding to the external network address of the network address translator 120 and the external The port number makes the two nodes connect to each other (as shown by the path Pt1), which will be blocked by the hairpin restriction described in the RFC 5128 document; if you want to use the internal network of the network node 111 and the network node 112 The route address and the internal port number make the two nodes connect to each other, then because the two network nodes do not belong to the same network address translator class, the internal network address and internal port of the network node 111 from the network node 112 When the packet is sent, it cannot pass through the network address translator 130 and transmit it to the network node 111 (as shown by the path Pt2), resulting in failure to establish the point-to-point connection

Therefore, a solution is really needed in this field to solve the above-mentioned deficiency that the point-to-point connection cannot be established

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