Abstract: Methods for node distribution in a P2P network system and include the steps of: mapping nodes to a numerical space respectively, wherein each node has a neighborhood table recorded a certain number of nodes and the certain number of nodes are close to the node along one of two sides in increasing and decreasing direction; performing a search process to find a plurality of reference nodes, wherein any two consecutive reference nodes are a first reference node and a second reference node, and the second reference node is the node in the neighborhood table of the first reference node and a distance between the second and the first reference node conforms to a predetermined condition; finding two positioning reference nodes; mapping a target node to a target value, and locating the target node in a position corresponding to the target value and informing the reference nodes of the position.

Abstract: A network gateway device providing peer-to-peer proxy service is provided, including a P2P meta descriptor detector detecting an original P2P meta descriptor file from the public network, a P2P proxy control unit modifying the original P2P meta descriptor file to generate a modified P2P meta descriptor file, and forwarding the modified P2P meta descriptor file to a computer in the private network, an internal tracker receiving a first inquiry message, and replying with a pseudo sharing computer list, and a peer-to-peer engine loading the original P2P meta descriptor file to download shared contents, and forwarding the shared contents to the computer.

Abstract: A network gateway device providing peer-to-peer proxy service is provided, including a P2P meta descriptor detector detecting an original P2P meta descriptor file from the public network, a P2P proxy control unit modifying the original P2P meta descriptor file to generate a modified P2P meta descriptor file, and forwarding the modified P2P meta descriptor file to a computer in the private network, an internal tracker receiving a first inquiry message, and replying with a pseudo sharing computer list, and a peer-to-peer engine loading the original P2P meta descriptor file to download shared contents, and forwarding the shared contents to the computer.

Abstract: A method and a system for peer-to-peer file transmission, suitable for an uploading peer to transmit a file to a downloading peer through a communication network, are provided. First, the uploading peer shares one or a plurality of pieces of the file. Then, the uploading peer selects one of the pieces of the file and suggests the downloading peer downloading the selected piece.

Abstract: A network gateway device is provided, including a P2P meta-descriptor detector detecting an original P2P meta-descriptor file, a P2P proxy control unit modifying the original P2P meta-descriptor and forwarding the modified P2P meta-descriptor file to a computer, an internal tracker receiving an inquiry message and replying when receiving a response, a storage unit storing shared file segments, an emulated external P2P client loading the original P2P meta-descriptor file, and an emulated internal P2P client performing an internal inquiry procedure and a load balancing procedure, determining whether the storage unit has the shared file segments, wherein if so, the shared file segments are retrieved and forwarded to the computer.