CN101789914B - Peer-to-peer communication device and method using peer-to-peer proxy service - Google Patents

Abstract

A network gateway apparatus. The point-to-point hyper-description file detector detects an original point-to-point hyper-description file from the public network domain. The point-to-point proxy server control unit modifies the original point-to-point hyper-description file to generate a modified point-to-point hyper-description file, and transfers the modified point-to-point hyper-description file to a computer in the private network domain. The internal point-to-point tracking server receives the first inquiry information and replies the pseudo sharing computer list to the computer. The peer-to-peer engine loads an original peer-to-peer hyper-description file, downloads the shared file segments, and forwards the downloaded shared file segments to the computer.

Description

Peer-to-peer communication device and method using peer-to-peer proxy service

technical field

The present invention relates to point-to-point communication proxy service (peer-to-peer proxy service) technology, in particular to a point-to-point communication device and method using point-to-point proxy service.

Background technique

In recent years, applications using point-to-point communication technology for file sharing have been widely used, such as communication protocols such as BitTorrent (BT for short) and eMule (eMule), users can easily download and obtain from other users on the Internet The desired file; the difference between peer-to-peer network technology and the traditional download method is that the traditional download method (centralized) usually uses a user to upload bandwidth to share files with other users, and when downloading the shared file When there are more users, the network resources and system resources on the sharing end will be strained, and the download bandwidth allocated to each user on the download end will be smaller; Each user who downloads the file also plays the role of sharing the file at the same time, so when there are more users who download the same shared file, the more download resources each downloader user can obtain, because the uploading task is distributed to each downloading users, thus solving the problem of large resource consumption when uploading by a single user in the past.

Although point-to-point communication technology solves the problem of centralized communication technology, the number of connections generated by application services using point-to-point communication technology is far more than other application services. ) sharer caused a great burden. The network address sharer uses Network Address Translation (NAT) technology, and the computers in the private network connected to the network address sharer all use private network addresses (private IP) to address. When a computer in the private network needs to connect to a computer in the public network, the network group will convert the private network address into an external public network address (public IP) address through the network address translation technology in the network address sharer , so the network address sharer can be regarded as a network gateway. During this conversion process, the network gateway will establish a network address translation table (NAT TranslationTable) to record the correspondence between the private network address and the public network address of each network connection, including the source network address (source IP), Source port (source port), destination network address (destination IP), destination port (destination port), mixed network address (mangled IP), mixed port (mangled port), and other connection signs and other information. FIG. 1 is an example showing the contents of the NAT table during the NAT process. When the user operates the network application program, each packet must query the conversion table to find the destination. With the increase of the number of connections, the number of groups, etc., the burden of table lookup and conversion on the device will inevitably increase rapidly, resulting in a significant decline in the performance of the network gateway.

Fig. 2 shows that a computer 221 located in a private network domain 220 communicates with a public peer-to-peer network located in a public network 210 according to a simulated torrent (torrent file) 201 The tracking server (Tracker) 212 inquires about the information of the computer that is sharing the file. According to the response from the public point-to-point tracking server, it knows that the computer 211 is sharing the file it wants to download, so it establishes a connection with the computer 211 and starts the download operation. A network gateway 230 connecting the public network domain 210 and the private network domain 220 maintains a network address translation table 231 according to the external connection status of any computer in the private network domain 220, including the Bittorrent connection between the computer 221 and the computer 211 information.

Contents of the invention

A network gateway device according to an embodiment of the present invention is connected between a public network domain and a private network domain, and includes a point-to-point hyperdescription file detector for detecting an original point-to-point hyperdescription file from the public network domain File; The point-to-point proxy server control unit receives the above-mentioned original point-to-point hyperdescription file from the above-mentioned point-to-point hyperdescription file detector, and modifies the point-to-point tracking server address recorded in the above-mentioned original point-to-point hyperdescription file into a private network address to generate a Modifying the peer-to-peer hyperdescription file, and transferring the modified peer-to-peer hyperdescription file to a first computer in a private network domain; an internal peer-to-peer tracking server, receiving a first query message from the first computer to generate a false share The computer list and the above-mentioned pseudo-shared computer list reply to the above-mentioned first computer; and the point-to-point engine loads the above-mentioned original point-to-point super description file, and receives a first request message from the above-mentioned first computer to download a shared file segment, downloading the above-mentioned shared file fragment according to the above-mentioned original peer-to-peer hyperdescription file, and transferring the downloaded above-mentioned shared file fragment to the above-mentioned first computer.

According to another embodiment of the present invention, a network gateway device is connected between a public network domain and a private network domain, and includes a point-to-point hyperdescription file detector for detecting an original point-to-point hypertext file from the public network domain. Descriptor file: The point-to-point proxy server control unit receives the above-mentioned original point-to-point hyper-description file from the above-mentioned point-to-point hyper-description file detector, and modifies the point-to-point tracking server address recorded in the above-mentioned original point-to-point hyper-description file into a private network address to generate A modification of the point-to-point hyperdescription file, and transfer of the modified point-to-point hyperdescription file to a first computer in a private network domain; an internal point-to-point tracking server, receiving a first query message from the first computer, and sending a fake The sharing computer list is returned to the first computer, so that the first computer downloads the shared file segment from the second computer according to the pseudo-sharing computer list; and the peer-to-peer engine loads the original peer-to-peer hyperdescription file.

According to another embodiment of the present invention, a point-to-point communication method for providing point-to-point server services in a network gateway device, wherein the above-mentioned network gateway device is connected between a public network domain and a private network domain, including: detecting An original peer-to-peer hyperdescription file of the above-mentioned public network domain; load the peer-to-peer engine according to the above-mentioned original peer-to-peer hyperdescription file; modify the address of the peer-to-peer tracking server recorded in the above-mentioned original peer-to-peer hyperdescription file into a private network address to generate a modification Point-to-point hyper-description file; transfer the above-mentioned modified point-to-point hyper-description file to a first computer in a private network domain; receive a first inquiry message from the above-mentioned first computer; reply the above-mentioned pseudo-sharing computer list to the above-mentioned first computer ; Receive a first request message from the above-mentioned first computer requesting to download a shared file segment; download the above-mentioned shared file segment according to the above-mentioned original point-to-point hyperdescription file; and transfer the downloaded above-mentioned shared file segment to the above-mentioned first computer.

Regarding other additional features and advantages of the present invention, some will be disclosed in the implementation methods, some can be clearly observed from the implementation methods, and some can be learned during the implementation process. The features and advantages of the invention will be realized by means of the elements and combinations pointed out in the appended claims.

The above summary of the invention and the following implementation methods are only examples and descriptions of the present invention, but they are not intended to limit the scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Description of drawings

FIG. 1 is an example showing the contents of the NAT table during the NAT process.

FIG. 2 shows a peer-to-peer communication architecture based on a simulated torrent.

FIG. 3 is a diagram illustrating a peer-to-peer communication method for providing a peer-to-peer proxy service in a network gateway device according to an embodiment of the invention.

FIG. 4 is a diagram illustrating a peer-to-peer communication method for providing a peer-to-peer proxy service in a network gateway device according to another embodiment of the present invention.

FIG. 5 is a flowchart showing a peer-to-peer communication method for providing a peer-to-peer proxy service in a network gateway device according to the present invention.

[Description of main component symbols]

201～torrent file;

210, 310～public network;

211, 221, 321, 412, 422～Computer;

220, 320～private network domain;

230, 330 ~ network gateway;

231, 336 ~ network address translation table;

301～Original point-to-point super description file;

302～Modify the peer-to-peer hyper description file;

311～Public point-to-point tracking server;

331～point-to-point hyper-descriptor detector;

332～point-to-point proxy server control unit;

333～peer-to-peer engine;

334～internal point-to-point tracking server;

335 ~ network address translation unit

Detailed ways

In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, some preferred embodiments are specially cited below, and in conjunction with the accompanying drawings, the detailed description is as follows:

FIG. 3 is a diagram illustrating a peer-to-peer communication method for providing a peer-to-peer proxy service in a network gateway device according to an embodiment of the present invention. In this embodiment, a network gateway 330 is connected between a public network domain 310 and a private network domain 320, and has a public network address 140.96.115.210 and a private network address 192.168.0.1, and the network gateway 330 The point-to-point proxy service is used, and the network connection of the point-to-point category is handed over to the relevant elements of the point-to-point proxy service for processing; the network gateway 330 includes a point-to-point super description file (P2Pmeta descriptor file) detector 331, a point-to-point proxy server control unit 332, an internal point-to-point tracking server (internal tracker) 334, a point-to-point engine (peer-to-peerengine) 333, and a network address translation unit 335. Compared with the architecture in FIG. 2 , the NAT table 336 in FIG. 3 does not need to record and maintain numerous point-to-point connection information, so the data volume of the NAT table 336 can be greatly reduced.

According to Fig. 3, when a computer 321 in the private network domain 320 attempts to perform a peer-to-peer connection, it will download an original peer-to-peer hyperdescription file 301 from the public domain 310, and the original peer-to-peer hyperdescription file 301 includes the information of the shared file segment and The network address and the port of the point-to-point tracking server, the point-to-point hyperdescription file detector 331 in the network gateway 330 can intercept the original point-to-point hyperdescription file 301, and forward it to the point-to-point proxy server control unit 332, the point-to-point proxy server control unit 332 This original point-to-point hyperdescription file 301 is forwarded to the point-to-point engine 333, and then the network address and port (not shown) of the above-mentioned point-to-point tracking server recorded in the original point-to-point hyperdescription file 301 are modified to the representative network of the internal point-to-point tracking server 334 Address and port (being the private network address 192.168.0.1:9786 of the network gateway device 330), to generate a modified point-to-point hyperdescription file 302, then the modified point-to-point hyperdescription file 302 is transferred to the computer 321; meanwhile, the point-to-point engine 333 loads Enter and modify the point-to-point hyperdescription file 302, and ask whether other computers are sharing the above-mentioned files to the internal point-to-point tracking server 334. In this embodiment, because there are no other computers in the private network domain 320. The pseudo-sharing computer list of the tracking server 334 does not have any records at this time. When the peer-to-peer engine 333 receives the pseudo-sharing computer list and finds that there are no other computers in the private network domain 320 to share the above-mentioned files, the peer-to-peer engine 333 reports to the internal peer-to-peer tracking server 334 that it is sharing the file, so that the internal peer-to-peer tracking server 334 updates Pseudo-sharing computer list, add the network address 192.168.0.1 and port (not shown) represented by the peer-to-peer engine 333.

Computer 321 sends a first query message to the internal point-to-point tracking server 334 to inquire about the computer information in sharing according to the above-mentioned point-to-point tracking server address recorded in the point-to-point super description file 302. In the file, the fake shared computer list information received by the computer 321 will contain the network address 192.168.0.1 and the port (not shown) of the peer-to-peer engine 333 . The computer 321 sends a first request message to the peer-to-peer engine 333 according to the information in the pseudo-sharing computer list, and requests to download the above-mentioned shared file segment. Point-to-point tracking server address, send an external inquiry message to a public point-to-point tracking server 311 located in the public network domain 310 to inquire about the computer information in sharing, and receive a response message from the public point-to-point tracking server 311, the response information includes a true share Computer list; the peer-to-peer engine 333 starts to download the above-mentioned shared file segments according to the above-mentioned true sharing computer list, and then transfers the downloaded shared file segments to the computer 321 .

It should be added that the computer 321 will periodically or non-periodically send inquiry information to the internal point-to-point tracking server 334 to inquire about the computer information that is sharing the file, and the computer 321 will know the computer that is sharing the file according to the received pseudo-sharing computer list information Is it still being shared.

In this embodiment, after the computer 321 has downloaded the shared file segment, the representative computer 321 can also share it with other computers at this time, then the computer 321 will report the status to the internal point-to-point tracking server 334, and the internal point-to-point tracking server 334 will update For the pseudo-shared computer list, add the network address (192.168.0.3) and port (not shown) of the computer 312 into the pseudo-shared computer list.

The network address translation unit 335 executes a network address translation program for all datagrams from or to the public network domain 310 except the above-mentioned external inquiry information, the above-mentioned response information, and the downloaded above-mentioned shared file segments, That is, data packets of the point-to-point communication type do not need to be processed by the NAT unit 335 .

In other embodiments, the network gateway 330 may have multiple private network addresses, so that the internal P2P tracking server 334 and the P2P engine 333 can respectively use different private network addresses as their representative network addresses.

FIG. 4 is a diagram illustrating a peer-to-peer communication method for providing a peer-to-peer proxy service in a network gateway device according to another embodiment of the present invention. In this embodiment, the computer 321 has completed the download through the point-to-point communication method as shown in Figure 3 and is in the state of sharing, that is, the pseudo-sharing computer list in the internal point-to-point tracking server 334 already contains the network address of the computer 321 (192.168. 0.3) and port (not shown) information.

When another computer 422 in the private network domain 320 also downloads the same original point-to-point hyperdescription file 301 (or different point-to-point hyperdescription files but the shared files recorded therein are identical) from the public network domain 310, the network gateway The point-to-point hyperdescription file detector 331 in the device 330 can intercept the original point-to-point hyperdescription file 301, and transfer it to the point-to-point proxy server control unit 332, and the point-to-point proxy server control unit 332 transfers the original point-to-point hyperdescription file 301 to the point-to-point Engine 333, then the network address 122.116.223.113 and the port (not shown) of the above-mentioned point-to-point tracking server recorded in the original point-to-point hyperdescription file 301 are modified to the network address and port (not shown) of the internal point-to-point tracking server 334 ( That is, the above-mentioned private network address 192.168.0.1:9786 of the network gateway 330) to generate a modified point-to-point hyperdescription file 302, and then transfer the modified point-to-point hyperdescription file 302 to the computer 422.

At this point, the peer-to-peer engine 333 loads and modifies the peer-to-peer hyperdescription file 302, and asks the internal peer-to-peer tracking server 334 whether other computers are sharing the above-mentioned files. With this file, the peer-to-peer engine 333 does not report any information to the internal peer-to-peer tracking server 334, so the internal peer-to-peer tracking server 334 does not need to update the network address 192.168.0.1 and port information of the peer-to-peer engine 333 to the pseudo-sharing computer list.

The computer 422 receives the revised peer-to-peer hyperdescription file 302 through the network gateway 330, and sends a second query message to the internal peer-to-peer tracking server 334 to inquire about the shared computer information according to the modified peer-to-peer hyper-description file 302, and the internal peer-to-peer tracking server 334 receives After receiving the above-mentioned second query information, return the fake shared computer list to the computer 422; in this embodiment, the fake shared computer list received by the computer 422 contains the connection information of the computer 321 (192.168. ), that is, the computer 321 is sharing the above-mentioned shared file segment that the computer 422 wants to download, and then starts to download the above-mentioned shared file segment to the computer 321.

It should be further explained that the internal point-to-point tracking server 334 will actively or passively update the list of pseudo-shared computers. , the peer-to-peer engine 333 will send a message of stopping sharing to the internal peer-to-peer tracking server 334, and the internal peer-to-peer tracking server 334 will also update its pseudo-sharing computer list, and the information of the peer-to-peer engine 333 will be deleted from the above-mentioned pseudo-sharing computer list; but when The peer-to-peer engine 333 finds that there is no computer sharing the above-mentioned files in the private network domain 320 by asking the internal peer-to-peer tracking server 334. For example, the computer 321 is offline or has deleted the file, and the peer-to-peer engine 333 will report to the internal peer-to-peer tracking server 334 that it is sharing This file, so that the internal peer-to-peer tracking server 334 updates the fake shared computer list, adding the network address 192.168.0.1 and port (not shown) represented by the peer-to-peer engine 333 .

When the computer 321 stops sharing and the computer 422 fails to download the file, it will send a third inquiry message to the internal point-to-point tracking server 334, and the internal point-to-point tracking server 334 will reply the above-mentioned false sharing computer list to the computer 422, and then the computer 422 according to the The pseudo-sharing computer list sends a second request message to the peer-to-peer engine 333 to request downloading of the above-mentioned shared file segment. After receiving the request information, the peer-to-peer engine 333 continues to download the above-mentioned shared file fragments, and then transfers the downloaded above-mentioned shared file fragments to the computer 422 .

In addition, the point-to-point proxy service mechanism of the present invention can also handle download requests from the public network domain 310 . The computer 412 located in the public network domain 310 can know that the peer-to-peer engine 333 of the network gateway 330 is sharing the above-mentioned shared file segment through the public peer-to-peer tracking server 311, because in the peer-to-peer communication architecture, each computer that downloads the shared file segment also At the same time upload the shared file fragment. Then the computer 412 sends a third request message to the peer-to-peer engine 333, requesting to download the above-mentioned shared file segment. At this time, the peer-to-peer engine 333 will ask the internal peer-to-peer tracking server 334 whether any computer is sharing the above-mentioned shared file in the private network domain 320 For file fragments, the internal point-to-point tracking server 334 returns the pseudo-sharing computer list to the peer-to-peer engine 333, if there is (that is, the pseudo-sharing computer list of the internal point-to-point tracking server 334 has the computer information that is sharing the above-mentioned shared file fragments in the private network domain 320) , the peer-to-peer engine 333 will then download to the computer in the private network domain 320 that is sharing the above-mentioned shared file segment, and transfer the downloaded above-mentioned shared file segment to the computer 412 .

The network address translation unit 335 executes the above-mentioned network address translation program for all data packets (datagram) from or sent to the public network domain 310 except the above-mentioned external query information, the above-mentioned response information, and the downloaded above-mentioned shared file segments. , which means that the data packets of the point-to-point communication type do not need to be processed by the NAT unit 335 .

FIG. 5 is a flowchart showing a peer-to-peer communication method for providing a peer-to-peer proxy service in a network gateway device according to the present invention. According to Fig. 5, when an original point-to-point hyperdescription file is detected by a network gateway device (step S01), the above-mentioned original point-to-point hyperdescription file is loaded into the peer-to-peer engine (step S02), and the above-mentioned original point-to-point hyperdescription file is modified to produce a Modify the point-to-point hyperdescription file (step S03), and then transfer the modified point-to-point hyperdescription file to a private network domain computer (step S04).

The peer-to-peer engine inquires the internal peer-to-peer tracking server by modifying the peer-to-peer super description file, and the internal peer-to-peer tracking server returns the pseudo-shared computer list to the peer-to-peer engine, and the peer-to-peer engine judges whether there is another private network domain computer sharing the above query information based on the pseudo-shared computer list The shared file fragment indicated in the ? (Step S05), if there is, it means that the pseudo-shared computer list contains another private network domain computer information of the shared file segment, and the above-mentioned network gateway device responds to the above-mentioned private network domain computer with the pseudo-shared computer list (step S06), and The above-mentioned private network domain computer further downloads the above-mentioned shared file segment from the above-mentioned another private network domain computer (step S07).

Back to step S05, if it is judged that there is no other private network domain computer sharing the shared file segment indicated in the above query information, the peer-to-peer engine returns its status to the internal peer-to-peer tracking server as sharing, and the internal peer-to-peer tracking server receives After the message sent back, it updates its pseudo-sharing computer list, and adds the network address and port information represented by the peer-to-peer engine into the pseudo-sharing computer list (step S08). When receiving the query information from the computer in the private network domain next time, the internal point-to-point tracking server responds to the computer in the private network domain with the pseudo-shared computer list (step S09). Then the above-mentioned private network domain computer sends a request message to the above-mentioned network gateway device to download the above-mentioned shared file fragment according to the above-mentioned pseudo-sharing computer list. When the above-mentioned network gateway device receives the above-mentioned request information, it downloads the above-mentioned The shared file segment (step S10), and the downloaded shared file segment is transferred to the above-mentioned private network domain computer (step S11).

When a public network domain computer learns that the above-mentioned network gateway is sharing the above-mentioned shared file fragment through a public peer-to-peer tracking server, because in the peer-to-peer communication architecture, each computer that downloads the shared file fragment also uploads the shared file fragment at the same time. Then the above-mentioned public network domain computer sends a request message to the above-mentioned network gateway to download the above-mentioned shared file fragment, and the above-mentioned network gateway is sharing the above-mentioned shared file fragment to the above-mentioned private network domain according to the information in the above-mentioned pseudo-sharing computer list computer to download, and transfer the downloaded above-mentioned shared file fragments to the above-mentioned public network domain computer.

Although the present invention is disclosed as above with examples, it is not intended to limit the scope of the present invention. Those skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope is to be determined as defined by the appended claims.

Claims (17)

1. A network gateway device, connected between a public network domain and a private network domain, comprising: A peer-to-peer hyperdescription file detector detects an original peer-to-peer hyperdescription file from the above-mentioned public domain, and the original peer-to-peer hyperdescription file includes the information of the shared file segment and the address and port of the peer-to-peer tracking server; The point-to-point proxy server control unit receives the above-mentioned original point-to-point hyper-description file from the above-mentioned point-to-point hyper-description file detector, forwards the original point-to-point hyper-description file to the point-to-point engine, and then sends the point-to-point tracing recorded in the above-mentioned original point-to-point hyper-description file Modifying the server address and port to the private network address and port of the internal point-to-point tracking server to generate a modified point-to-point hyperdescription file, and transferring the modified point-to-point hyperdescription file to a first computer in a private network domain; an internal point-to-point tracking server, receiving a first inquiry message from the first computer, and replying a list of pseudo-shared computers to the first computer; and The point-to-point engine loads the above-mentioned original point-to-point super description file. When there is no record in the above-mentioned pseudo-sharing computer list, the point-to-point engine reports that the above-mentioned internal point-to-point tracking server is sharing the above-mentioned shared file fragment, then the above-mentioned internal point-to-point tracking server will share the above-mentioned point-to-point The information represented by the engine is updated to the above-mentioned pseudo-sharing computer list, the peer-to-peer engine receives a first request message from the above-mentioned first computer to download the shared file segment, and downloads the above-mentioned shared file segment according to the above-mentioned original peer-to-peer hyperdescription file, and transferring the downloaded above-mentioned shared file fragments to the above-mentioned first computer, Wherein the above-mentioned pseudo-sharing computer list is a list of computers that are sharing the above-mentioned shared file segment. 2. The network gateway device according to claim 1, wherein when the first computer has downloaded the shared file segment, the internal point-to-point tracking server updates the information represented by the first computer to the pseudo-shared computer list . 3. The network gateway device as claimed in claim 2, wherein the point-to-point proxy server control unit also forwards the modified point-to-point hyperdescription file to a second computer in the private network domain. 4. The network gateway device as claimed in claim 3, wherein said internal point-to-point tracking server also receives a second inquiry message from said second computer, and replies the list of pseudo-shared computers to said second computer, so that said second The computer downloads the above-mentioned shared file segment from the above-mentioned first computer. 5. The network gateway device as claimed in claim 3, wherein when the first computer stops sharing the shared file segment, the internal peer-to-peer tracking server updates the information represented by the peer-to-peer engine to the list of pseudo-sharing computers, and the internal peer-to-peer When the tracking server receives a third inquiry message from the second computer, it replies the fake sharing computer list to the second computer. 6. The network gateway device as claimed in claim 5, wherein the peer-to-peer engine also receives a second request message from the second computer for downloading the segment of the shared file, and downloads the shared file according to the original peer-to-peer hyperdescription file segment, and transfer the downloaded segment of the shared file to the second computer. 7. The network gateway device as claimed in claim 2, wherein the peer-to-peer engine also receives a third request message from a third computer in the public network domain to download the segment of the shared file, and the peer-to-peer engine according to the internal peer-to-peer The above-mentioned fake sharing computer list returned by the tracking server is downloaded to the above-mentioned first computer that is sharing the above-mentioned shared file segment, and the downloaded above-mentioned shared file segment is transferred to the above-mentioned third computer. 8. A network gateway device connected between a public network domain and a private network domain, comprising: A peer-to-peer hyperdescription file detector detects an original peer-to-peer hyperdescription file from a public network domain, and the original peer-to-peer hyperdescription file includes the information of the shared file segment and the address and port of the peer-to-peer tracking server; The point-to-point proxy server control unit receives the above-mentioned original point-to-point hyper-description file from the above-mentioned point-to-point hyper-description file detector, forwards the original point-to-point hyper-description file to the point-to-point engine, and then sends the point-to-point tracing recorded in the above-mentioned original point-to-point hyper-description file Modifying the server address and port to the private network address and port of the internal point-to-point tracking server to generate a modified point-to-point hyperdescription file, and transferring the modified point-to-point hyperdescription file to a first computer in the above-mentioned private network domain; An internal point-to-point tracking server, which receives a first inquiry message from the first computer, and replies a pseudo-shared computer list to the first computer, so that the first computer can obtain information from a second computer included in the pseudo-shared computer list. Download the above-mentioned fragment of the shared file; and Peer-to-peer engine, load the above original peer-to-peer hyperdescription file, Wherein the above-mentioned pseudo-sharing computer list is a list of computers that are sharing the above-mentioned shared file segment. 9. The network gateway device as claimed in claim 8, wherein when the internal peer-to-peer tracking server detects that the second computer stops sharing the shared file segment, the internal peer-to-peer tracking server updates the information represented by the peer-to-peer engine to the above-mentioned A list of pseudo-sharing computers. When the internal point-to-point tracking server receives a second inquiry message from the first computer, it replies the list of pseudo-sharing computers to the first computer. 10. The network gateway device as claimed in claim 9, wherein the peer-to-peer engine also receives a first request message from the first computer to download the segment of the shared file, and downloads the shared file according to the original peer-to-peer hyperdescription file segment, and transfer the downloaded segment of the shared file to the first computer. 11. The network gateway device as claimed in claim 8, wherein the peer-to-peer engine also receives a second request message from a third computer in the public network domain to download the segment of the shared file, and the peer-to-peer engine according to the internal peer-to-peer The above-mentioned pseudo-sharing computer list returned by the tracking server is downloaded to the computer that is sharing the above-mentioned shared file segment, and the downloaded above-mentioned shared file segment is transferred to the above-mentioned third computer. 12. A point-to-point communication method for providing point-to-point server services in a network gateway device, wherein the network gateway device is connected between a public network domain and a private network domain, comprising: Detect an original peer-to-peer hyperdescription file from the above-mentioned public network domain, the original peer-to-peer hyperdescription file includes the information of the shared file segment and the address and port of the peer-to-peer tracking server; Load the above original peer-to-peer hyperdescription file into the peer-to-peer engine; Modify the point-to-point tracking server address and port recorded in the original point-to-point hyperdescription file to the private network address and port of the network gateway device to generate a modified point-to-point hyperdescription file; Transfer the modified peer-to-peer hyperdescription file to a first computer in the private network domain; receiving a first query message from the first computer; Judging whether a second computer in the above-mentioned private network domain is sharing a shared file segment requested by the first computer to download according to a pseudo-sharing computer list; If it is determined that a second computer is sharing the shared file segment in the above-mentioned private network domain, then perform the following steps: An internal point-to-point tracking server replies the above-mentioned fake sharing computer list to the above-mentioned first computer; The first computer downloads the above-mentioned shared file segment from the second computer; and If it is judged that none of the above-mentioned second computers is sharing the above-mentioned shared file segment, then perform the following steps: When the peer-to-peer engine reports that the internal peer-to-peer tracking server is sharing the shared file segment, the internal peer-to-peer tracking server updates the information represented by the peer-to-peer engine to the pseudo-sharing computer list; Reply the above-mentioned pseudo-sharing computer list to the above-mentioned first computer; When receiving a first request from the first computer to download the shared file segment, the peer-to-peer engine downloads the shared file segment according to the original peer-to-peer hyperdescription file; and and transferring the downloaded segment of the shared file to the first computer. 13. The peer-to-peer communication method according to claim 12, further comprising transferring the modified peer-to-peer hyperdescription file to a third computer in the private network domain. 14. The point-to-point communication method according to claim 13, further comprising: when receiving a second inquiry message from the third computer, replying the list of pseudo-shared computers to the third computer. 15. The peer-to-peer communication method according to claim 14, further comprising: when detecting that the second computer stops sharing the shared file segment, the internal peer-to-peer tracking server updates the information represented by the peer-to-peer engine to the pseudo-sharing computer list , and when receiving a third inquiry message from the third computer, replying the list of pseudo-sharing computers to the third computer. 16. The point-to-point communication method as claimed in claim 15, further comprising that the point-to-point engine receives a second request message from the third computer to download the above-mentioned shared file segment, and downloads the above-mentioned shared file according to the above-mentioned original point-to-point hyperdescription file segment, and transfer the downloaded segment of the shared file to the third computer. 17. The peer-to-peer communication method as claimed in claim 12, further comprising the peer-to-peer engine receiving a third request message from a fourth computer in the public network domain requesting to download the segment of the shared file, and sending it to the private network domain The computer sharing the above-mentioned shared file segment downloads, and transfers the downloaded above-mentioned shared file segment to the above-mentioned fourth computer.

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