CN101374141A - TCP NAT crossing method base on PCP protocol - Google Patents
TCP NAT crossing method base on PCP protocol Download PDFInfo
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- CN101374141A CN101374141A CNA2007100709713A CN200710070971A CN101374141A CN 101374141 A CN101374141 A CN 101374141A CN A2007100709713 A CNA2007100709713 A CN A2007100709713A CN 200710070971 A CN200710070971 A CN 200710070971A CN 101374141 A CN101374141 A CN 101374141A
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Abstract
The invention discloses a TCP NAT (Network Address Translation) traversing method based on PCP (Peercast Protocol) Protocol. The traversing method adopt three critical technologies such as NAT type detection and port prediction, the design of an NAT traversing server, and PCP protocol expansion, and combines TCP NAT realization principle with the PCP expansion protocol to realize connection between host computers in two private networks and media data interchange by a few critical steps such as registering, detecting the NAT type, predicting terminal, interchanging NAT mapping IP address and a Port number, and performing connecting part boring and connected part perforation.
Description
Technical field
The present invention relates to a kind of TCP NAT traversing method based on PCP (Peercast Protocol) agreement.
Background technology
There are many P2P video jukebox software to be based on that Peercast exploitation realizes at present, as the present Tvants video jukebox software of using of Zhejiang telecommunications, Peercast is the P2P Streaming Media software of increasing income by external exploitation, PCP (Peercast Protocol) agreement that Peercast is self-defined, media data between the Peercast and control messages are all transmitted by the PCP agreement, the PCP agreement is the application layer protocol that is based upon on the TCP/UDP transport layer, the PCP agreement is used the TCP transport layer protocol at present, in the current Internet network environment, there is a large amount of NAT (Network Address Translation) equipment, created separate areas in logic, make the peer node be in behind the NAT directly not connect and to communicate by letter, therefore, the video jukebox software of developing on based on Peercast all can face the problem that TCP NAT passes through.
Summary of the invention
The present invention is in order to address the above problem, and on the basis of various solutions that research TCP NAT passes through and PCP agreement, proposed a kind of reliably based on the TCP NAT traversing method of PCP agreement.The present invention has utilized TCP NAT to pass through to realize principle and to the expansion of PCP agreement, by registration, NAT type detection, port prediction, intercourse NAT mapping IP address and Port port numbers, initiate that the connection side burrows and Durchgangshohle several committed steps in the side's of being connected realize in two private networks connection between the main frame and communicate by letter, it realizes that principle is as shown below, and its detailed process is as follows:
1), at first connecting NAT earlier by the side of being connected passes through server, foundation registration passage.Use by this passage and to finish registration ID number of this machine of sign, then do not carry out the NAT type detection in the past or discovery NAT disposes change if register, then need to carry out the NAT type detection, testing process is as follows:
Be connected direction NAT and pass through server four connections of initiation continuously, set up the passage that echoes.The NAT server returns four times respectively by this passage and connects corresponding NAT N mapping IP address and port numbers, and the side of being connected carries out analysis and judgement and keep a record being preserved to the result who returns, and waits for after having detected receiving the connection request of initiating the connection side;
2), initiate the connection side and also need as above-mentioned, to finish registration, NAT type detection and analysis and judgement and record, then initiate the connection side and connect NAT and pass through server, set up communication port, initiate the connection side by this passage transmission connection request;
3), NAT passes through server after receiving the connection request of initiating the connection side, set up needed IP address, interchange channel and Port port numbers to initiating the transmission of the connection side and the side of being connected respectively, initiate the connection side and carry out the port prediction after receiving immediately and the NAT M mapping IP address of prediction and port numbers are sent to NAT by the interchange channel passing through server, the side of being connected also finishes same action the while.After NAT passes through the IP address and Port port numbers that server receives NAT M and NAT N mapping respectively, respectively the IP address and the Port port numbers of NAT N mapping are sent to the initiation connection side by the interchange channel, IP address and Port port numbers that NAT M is shone upon send to the side of being connected;
4), initiation is connected to the side of being connected immediately after the IP address of receiving the other side NAT N mapping and Port port numbers to initiate the connection side, also promptly begin to burrow.Burrow and monitor in this locality after the success, wait for the connection request of the side of being connected;
5), the side of being connected initiates to be connected to the initiation connection side after the IP address that receives the other side NAT M mapping and Port port numbers immediately, also promptly begins Durchgangshohle.After the Durchgangshohle success, initiate the connection side and can send to the side of being connected and confirm that ACK wrap, the connection that has so just realized both sides with communicate by letter.
In actual applications above-mentioned TCP NAT is passed through and realize that principle combines with the PCP Extended Protocol, just can realize passing through based on the TCP NAT of PCP agreement, so-called PCP agreement, Peercast Protocol just, be that Peercast is used for media data bag and the self-defining agreement of various control messages between node, this agreement is the application layer protocol that is based upon on the TCP/UDP agreement, the PCP agreement is used transport layer protocol at present, for realizing passing through and need expand the PCP agreement based on the TCP NAT of PCP agreement, the PCP protocol stack after the expansion is as shown below:
The PCP Extended Protocol mainly is to have increased by two message: one is the message that burrows, and another is Durchgangshohle message, and is as follows:
Message burrows:
OPENHOLE*HTTP/1.1
PEERID: peer ID number
CHANID: channel ID number
Durchgangshohle message:
THROUGHHOLE*HTTP/1.1
GROUP: group number
HOPS: jumping figure
TTL: time-delay
DESTID: destination host ID number
FROMID: source host ID number
CHANID: channel ID number
VERSION: version number
These two message are encapsulated in the http protocol respectively by clean culture and broadcast transmission.
After TCP NAT passed through and realizes that principle and PCP Extended Protocol combine, its concrete steps were as follows:
When node A will play a certain channel, can send channel request to streaming media server.After streaming media server is received this request, whether carry out decision node A earlier exists fire compartment wall or is in after the NAT M, judge subsequently whether this machine can provide media data for this node, if streaming media server can not provide media data, then streaming media server will be selected a node from the node listing of this channel, if this node of choosing also is in after NAT or the fire compartment wall, then to transmission broadcasting Durchgangshohle requests such as Node B, time-delay N after second to the node A clean culture request message that burrows, after Node B receives broadcasting Durchgangshohle request message, judge whether this message sends to this machine, if, then pass through server and finish registration and NAT type detection by NAT, wait node A burrows and finishes afterwards, after node A receives the request message that burrows, pass through server by NAT and finish registration, the NAT type detection, the port prediction, exchange NAT mapping IP address and Port port numbers with Node B, begin afterwards to burrow, monitor in this locality after the success, Node B burrows at node A and begins Durchgangshohle after finishing, also promptly initiate to connect to node A, connect to set up between two nodes of back and just can begin to transmit PCP message and media data, for this implementation procedure better is described, special with this method drafting pattern, implementation procedure is as shown below:
Wherein node A and Node B lay respectively at the main frame in NAT M and NAT N two private networks afterwards, and Node B and streaming media server have connected and can normally send and receive message and media data.
The present invention utilizes TCP NAT to pass through to realize principle and to the expansion of PCP agreement, has realized passing through based on the TCP NAT of PCP agreement, has also promptly realized the connection between the main frame and the exchange of PCP message and media data in two private networks.
Embodiment
Embodiment 1
Suppose customer end A as initiating the connection side, customer end B is as the side of being connected, and service end S passes through server as NAT, realizes that the process that TCP NAT passes through can be divided into following five steps:
1), the Connection Service end S of customer end B elder generation, set up the registration passage, use by this passage and finish registration ID number of this machine of sign, do not carry out the NAT type detection in the past or found that NAT disposes change if registered the back, then need to carry out the NAT type detection, testing process is as follows:
Customer end B is initiated to connect for four times to server S continuously, sets up the passage that echoes, and server S is returned four times respectively by this passage and connected corresponding NAT N mapping IP address and port numbers.Server S carries out analysis and judgement and keeps a record being preserved to the result who returns for four times, and customer end B is waited for the connection request that receives customer end A then;
2), customer end A need finish registration, NAT type detection and analysis and judgement and record equally, then customer end A Connection Service end S sets up communication port, client sends connection request by this passage;
3), service end S is behind the connection request that receives the customer end A transmission, set up needed IP address, interchange channel and Port port numbers to customer end A and customer end B transmission respectively, carry out the port prediction after customer end A receives immediately and NAT M mapping IP and the port numbers of predicting sent to service end S by the interchange channel, customer end B is also finished same action, after service end receives the IP address and Port port numbers of NAT M and NAT N mapping respectively, respectively the IP address and the Port port numbers of NAT N mapping are sent to customer end A by the interchange channel, the IP address and the Port port numbers of NAT M mapping are sent to customer end B, so just are that two clients have realized exchanging the purpose that NAT separately shines upon IP address and Port port numbers;
4), customer end A initiates to be connected to customer end B after the IP address of receiving the other side NAT N mapping and Port port numbers immediately, also promptly begin to burrow, after the success that burrows at the connection request of this locality monitoring customer end B;
5), customer end B is connected to the customer end A initiation after the IP that receives the other side NAT M mapping and Port immediately, also promptly begins Durchgangshohle.After the Durchgangshohle success, customer end A can send confirms that ACK wraps to customer end B, and both sides' connection has just been set up like this, just can communicate by letter afterwards.
Embodiment 2
Above-mentioned TCP NAT is realized passing through principle combine with the PCP agreement and realize that TCP NAT passes through, its crossing process is as shown below.Wherein node A and Node B lay respectively at the main frame in NAT M and NAT N two private networks afterwards, and S is a streaming media server, and Node B and stream media server S have connected and can normally send and receive message and media data, and implementation procedure is as follows:
When node A will play a certain channel, can send channel request to stream media server S.After server S is received this request, carry out decision node A earlier and whether have fire compartment wall or be in after the NAT M, judge subsequently whether this machine can provide media data for this node.If server S can not provide, then from the node listing of this channel, select a node.If this node of choosing also is in after NAT or the fire compartment wall, then send the request of broadcasting Durchgangshohle to nodes such as B.Time-delay N after second to the node A clean culture request message that burrows.After Node B receives broadcasting Durchgangshohle request message, judge whether this message sends to this machine, if, then pass through server and finish registration and NAT type detection by NAT, wait for afterwards that the other side burrows to finish.After node A receives the request message that burrows, pass through server by NAT and finish registration, NAT type detection, port prediction, exchange NAT mapping IP address and Port port numbers, begin afterwards to burrow, monitor in this locality after the success that burrows with Node B.Node B burrows at node A and begins Durchgangshohle after finishing, and also promptly initiates to connect to node A.Connect to set up between two nodes of back and just can transmit PCP message and media data.
Claims (4)
1. TCP NAT (NetworkAddress Translation) traversing method based on PCP (Peercast Protocol) agreement is characterized in that comprising that NAT mapping IP address is predicted, intercoursed to registration, NAT type detection, port and Port port numbers, initiation connection side burrow and the side's of being connected Durchgangshohle several steps.
2. a kind of TCP NAT traversing method based on the PCP agreement according to claim 1 is characterized in that comprising the steps:
1), at first connects NAT earlier and pass through server by the side of being connected, set up the registration passage, use by this passage and to finish registration ID number of this machine of sign, if having registered the back did not carry out the NAT type detection in the past or found that NAT disposed change, then need to carry out the NAT type detection, testing process is as follows:
Be connected direction NAT and pass through server four connections of initiation continuously, set up the passage that echoes.NAT passes through server and returns four connections corresponding NAT mapping IP address and port numbers respectively by this passage, the side of being connected carries out analysis and judgement and keeps a record being preserved to the result who returns, after having detected, the side of being connected waits for and receives the connection request of initiating the connection side;
2), initiate the connection side and also need as above-mentioned, to finish registration, NAT type detection and analysis and judgement and record, initiate the connection side afterwards and connect NAT and pass through server, set up communication port.Initiate the connection side and send connection request by this passage;
3), NAT passes through server after receiving the connection request of initiating the connection side, set up needed IP address, interchange channel and Port port numbers to initiating the transmission of the connection side and the side of being connected respectively, initiating the connection side carries out the port prediction after receiving and the NATM mapping IP address of prediction and port numbers is sent to NAT by the interchange channel passing through server immediately, the side of being connected also finishes same action simultaneously, after NAT passes through the IP address and Port port numbers that server receives NAT M and NAT N mapping respectively, respectively the IP address and the Port port numbers of NAT N mapping are sent to the initiation connection side by the interchange channel, the IP address and the Port port numbers of NAT M mapping are sent to the side of being connected, so just reached the purpose of exchanging NAT mapping IP address and Port port numbers;
4), initiation is connected to the side of being connected immediately after the IP address of receiving the other side NAT N mapping and Port port to initiate the connection side, also promptly begin to burrow, after the success that burrows at the connection request of this locality monitoring side of being connected;
5), the side of being connected initiates to be connected to the initiation connection side after the IP address that receives the other side NAT M mapping and Port port numbers immediately, also promptly begins Durchgangshohle.After the Durchgangshohle success, the initiation connection side can send and confirm that ACK wraps to the side of being connected, and has so just realized the connection between the main frame in two private networks.
3. method of passing through based on the TCP NAT of PCP agreement is characterized in that and the combining of PCP agreement.
4. a kind of method of passing through based on the TCP NAT of PCP agreement as claimed in claim 3 is characterized in that and the combining of PCP agreement that its process is as follows:
Node A and Node B lay respectively at the interior main frame of two private networks after NAT M and the NAT N, and Node B and streaming media server have connected and can normally send and receive message and media data.When node A will play a certain channel, can send channel request to streaming media server, after server is received this request, whether carry out decision node A earlier exists fire compartment wall or is in after the NAT M, judge subsequently whether this machine can provide media data for this node, if streaming media server can not provide media data, then streaming media server will be selected a node from the node listing of this channel, if this node of choosing also is in after NAT or the fire compartment wall, then streaming media server sends broadcasting Durchgangshohle request message to nodes such as B, time-delay N after second to the node A clean culture request message that burrows, after Node B receives broadcasting Durchgangshohle request message, judge whether this message sends to this machine, if, then pass through server and finish registration and NAT type detection by NAT, wait for afterwards that the other side burrows and finish, after node A receives the request message that burrows, pass through server by NAT and finish registration, the NAT type detection, the port prediction, exchange NAT mapping IP address and Port port numbers with Node B, begin afterwards to burrow, monitor in this locality after the success, Node B burrows at node A and begins Durchgangshohle after finishing, also promptly initiate to connect to node A, connection is set up between two nodes of back just can begin to transmit PCP message and media data.
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| CNA2007100709713A CN101374141A (en) | 2007-08-23 | 2007-08-23 | TCP NAT crossing method base on PCP protocol |
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| CN108989034B (en) * | 2018-08-03 | 2021-09-14 | 苏州国芯科技股份有限公司 | Audio and video monitoring method and system, monitoring server and computer medium |
| CN108989034A (en) * | 2018-08-03 | 2018-12-11 | 苏州国芯科技有限公司 | A kind of audio-video monitoring method, system, monitoring server and computer media |
| CN110138852A (en) * | 2019-05-09 | 2019-08-16 | 深圳市宏电技术股份有限公司 | A kind of long-range connection method, remote connecting device and remotely connect system |
| CN112532757A (en) * | 2019-09-19 | 2021-03-19 | 华为技术有限公司 | NAT traversal method, equipment and system |
| CN113452805A (en) * | 2019-09-19 | 2021-09-28 | 华为技术有限公司 | NAT traversal method, equipment and system |
| CN113452805B (en) * | 2019-09-19 | 2022-06-07 | 华为技术有限公司 | NAT traversal method, equipment and system |
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| CN112532757B (en) * | 2019-09-19 | 2023-11-14 | 华为技术有限公司 | NAT traversal method, equipment and system |
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