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File transmission method

A technology for file transfer and specified files, which is applied in the direction of transmission systems, electrical components, etc., can solve the problems that files are not allowed to be accessed, and the hidden dangers of TFTP server performance bottlenecks cannot be eliminated, so as to achieve the effect of eliminating performance bottlenecks

Active Publication Date: 2010-09-22
BEIJING HAN NETWORKS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0030] 2 The specified file does not allow access
[0032] 4 Unrecognized TFTP opcode
[0070] The above-mentioned RFC2347, RFC2348, and RFC2349 only extend the TFTP protocol to optimize the transmission efficiency, but in essence they still have a client / server (Client / Server, CS) structure, which cannot eliminate the hidden danger of TFTP server performance bottlenecks

Method used

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Examples

Experimental program
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Effect test

Embodiment approach

[0097] The file transfer method according to the embodiment of the present invention is an optimization of TFTP based on RFC2347, specifically, extending TFTP options and introducing a peer-to-peer (Peer-to-Peer, p2p) mechanism.

[0098] By introducing a p2p mechanism between file transfer devices, the file transfer device is not fixed as a client or server, but can work in client mode or server mode, or work in client mode at the same time, and supports temporary server.

[0099] Specifically, the p2p mechanism means that the client first obtains file information from a server (here called first), and the file information includes "file size" and "indicating which other servers (here called second, possibly multiple) can provide Information about the specified download file", etc.

[0100] At this time, the name of the custom option, that is, op is "p2p", which is an ascii string terminated by 0. The op option only supports RRQ (that is, downloading files) and OACK instruct...

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PUM

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Abstract

The invention discloses a file transmission method for realizing a point-to-point file transmission mechanism. The method is characterized by comprising the following steps that: a client makes a request for downloading a specified file to a fixed server end; and a fixed server orders the client to download the specified file from the fixed server end or a temporary server, wherein the temporary server refers to another client which was downloaded as the client, stores the specified file and can provide a file downloading service for the client; and the fixed server stores a temporary server list in which the Internet protocol addresses of other clients forming the temporary server are recorded.

Description

technical field [0001] The present invention relates to a file transfer method, in particular to a file transfer method optimized based on Trivial File Transfer Protocol (TFTP). Background technique [0002] TFTP is a simple protocol for transferring files (refer to RFC (Request For Comments) 1350), and its implementation is based on the User Datagram Protocol (UDP), which can transfer files between hosts on different networks. [0003] The TFTP will be described in detail below. [0004] TFTP is implemented based on UDP, and its protocol layers from bottom to top are physical layer, data link layer, Internet Protocol (Internet Protocol, IP) layer, UDP layer, and TFTP layer. TFTP uses port 69 as the server port, and supports the following five commands. [0005] opcode operation [0006] 1 Read request (RRQ) [0007] 2 Write request (WRQ) [0008] 3 Data (DATA) [0009] 4 Acknowledgment (ACK) [0010] 5 Error (ERROR) [0011] Among them, packets with opcodes 1, 2, 3,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/08
Inventor 刘靖非范成龙
Owner BEIJING HAN NETWORKS TECH CO LTD
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