Method and system for realizing NAT traversal in structured P2P network

Abstract

The invention discloses a method and a system for realizing NAT traversal in a structured P2P network. The method comprises that: a user node contacts a guide node positioned in an outer network to acquire the information of other user nodes which are different from the ID of the user node or have a distance in a set value in a guide node route table and establish and update a route table per se;and the user node judges whether the external IP address and port number per se are the same as the IP address and port number of a intranet, if the external IP address and port number are the same as the IP address and port number of the intranet, the user node is positioned in the outer network, and if the external IP address and port number are not the same as the IP address and port number ofthe intranet, the user node is positioned in the intranet; the user node selects a user node positioned in the outer network at random as a partner node per se and adds the information of the partnernode; simultaneously, the user node sends IP address, port number and ID updating messages including the partner node to each node in the route table, and each node updates the information of respective route table; control information is transmitted between user nodes in a mode of forwarding by the partner node; and data information is transmitted between the user nodes in a mode of assisting connection by the partner node.

Description

technical field [0001] The invention relates to the field of P2P networks, in particular to a method and system for realizing NAT traversal in structured P2P networks. Background technique [0002] With the continuous development of computer networks, a peer-to-peer (Peer-to-Peer, P2P) communication mode is used by more and more network applications. In a P2P network, structured P2P means that the topology of the P2P network overlay layer is strictly controlled, and resources are not randomly scattered and stored on nodes, but are stored in a way that makes queries more efficient. In a structured P2P system, each node only stores specific information or an index of specific information. When users need to obtain information in a structured P2P system, they must know which nodes the information (or indexes) may exist in. Since users know in advance which nodes should be searched, flooding lookups used in unstructured P2P systems are avoided, thus improving the efficiency of...

AI Technical Summary

Problems solved by technology

However, the current NAT traversal solution of UDP hole punching technology is not suitable for use in structured P2P networks. First, because the NAT traversal solution of UDP hole punching technology requires the support of a traversal server on the external network, which will destroy the structured P2P network. It is completely distributed and has the disadvantage of a single point of failure; in addition, for the control information in the structured P2P network, due to its small amount of data, the cost of the traversal process is relatively large, so it is not suitable for control information in the process of crossing

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