CN101043443B - Private network through network education training underlayer soft switching platform system and soft switching method - Google Patents
Private network through network education training underlayer soft switching platform system and soft switching method Download PDFInfo
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- CN101043443B CN101043443B CN2007100206381A CN200710020638A CN101043443B CN 101043443 B CN101043443 B CN 101043443B CN 2007100206381 A CN2007100206381 A CN 2007100206381A CN 200710020638 A CN200710020638 A CN 200710020638A CN 101043443 B CN101043443 B CN 101043443B
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Abstract
The disclosed bottom soft-exchange platform for private network crossing network education training system comprises: a common network education and training soft-exchange platform device, some crossing severs in different service areas, and a swarm decision server set on the soft-exchange platform. Wherein, the crossing server communicates with user by TCP/IP protocol, and uses TRANS protocol for communication with the swarm decision server. The user needs no special protocol, nor modifies NAT, agent server or firewall. Thereby, this invention saves much capital and equipment modification, and improves the parallel processing capacity of bottom soft-exchange platform greatly.
Description
One, technical field
The present invention relates to a kind of computer network system, particularly a kind of private network through network education training underlayer soft switching platform system and soft switching method that this system realized of being used for.
Two, background technology
Exchange with two-way video based on the VOIP of IP technology in the world at present and begin to apply in the public, it adopts in a large number based on the soft-switch platform of NGN international standard Session Initiation Protocol, various computer software terminal and hard terminal.In the network education training system, solve and use general visual hard terminal to carry out two-way video to exchange the soft switching platform system that substantially all adopts based on Session Initiation Protocol as the bottom communication plateform system., because the still IPv4 standard that the current Internet network uses, the public network IP address shortage forces many enterprises, mini operators and individual all to use private network IP address, connects the Internet network by NAT or acting server then.In addition, objectively spreading unchecked of virus and network attack also forces the abundant company of many public network IP address to use fire compartment wall to take precautions against, and causes intra-company all to use private network IP address.Yet Session Initiation Protocol is to rely on IP network to carry out multimedia communication, and the current agreement that adopts still needs the IP address of user terminal to reach, and just requiring the IP address of user terminal is public network IP address.So, underlayer soft switching platform based on the network education training system of public network IP address Session Initiation Protocol is faced with the contradiction that the user uses private network IP address in a large number now, and addressing this problem is this next generation multimedia communication system key of popularization and application fast.
Current, many companies have adopted certain methods to attempt to address the above problem on the underlayer soft switching platform product of its network education training system, but all exist drawback, and conclusion is got up to mainly contain following several:
1, change original fire compartment wall, NAT device on soft-switch platform, adopt the fire compartment wall or the NAT device of new support ALG agreement, shortcoming is to change existing equipment, invests huge.
2, increase the STUN server on soft-switch platform, and increase the Simple Traversal of UDP Through Network Address Translators support at communication terminal, solved the problem of part NAT device, shortcoming is must increase the STUN server and client need be supported Simple Traversal of UDP Through Network Address Translators.
3, on soft-switch platform, increase the TURN server, and in the support of communication terminal employing TURN agreement, solve nearly all NAT device and part firewall problem, shortcoming is must increase the TURN server and client need be supported the TURN agreement, and under each NAT a communication terminal only can be arranged.
4, soft-switch platform is transformed existing fire compartment wall or NAT by adopting the MidCom mode, makes it support the MiddleBox agreement, get in touch with the MidCom Agent of far-end, solve the problem that user terminal adopts private net address, shortcoming is that the scrap build amount is many, invests huge.
Though above-mentioned like product provides some to solve the method for penetrating through private network, but all need significantly to transform the underlayer soft switching platform of existing network educational training system, and promote user terminal or promote middle NAT device, this is to be difficult to realize in practical operation.
Three, summary of the invention
1, goal of the invention: the objective of the invention is to overcome the deficiencies in the prior art, provide a kind of need on the underlayer soft switching platform basis of legacy network educational training system, to increase small number of devices, and user side need not increase equipment and the agreement support just can solve the private network crossing problem, and the network education training soft switching platform system that the concurrent processing ability is significantly improved, the present invention also provides the switching method that this soft-switch platform adopted.
2, technical scheme: private network through network education training underlayer soft switching platform system of the present invention, it comprises the universal network educational training soft-switch platform equipment that is used for exchanges data and processing, it is characterized in that: it also is provided with to be distributed in provides the server that passes through of communication service for the user in the different coverages, and be arranged on the cluster judgement server that server is passed through in each zone of management on the underlayer soft switching platform of network education training, described passing through between server and the user is connected by network, and adopts ICP/IP protocol to carry out data communication; Described passing through between server and the cluster judgement server is connected by high-speed wideband, and employing TRANS agreement is carried out data communication; When customer call, select one by cluster judgement server by the condition of having set and pass through server, then this passes through server user's connectivity port situation by the TRANS protocol apprizes, passes through server and then creates 2-4 port and inform that cluster adjudicates server; In case the user tears chain open, then the underlayer soft switching platform of network education training can be adjudicated server by cluster and be informed that this passes through server and reclaims the corresponding port of creating previously; When user terminal sends information, the underlayer soft switching platform of network education training is by the underlayer soft switching platform registration of modification network education training and the processing mode of hello protocol, according to IP address, select one by cluster judgement server and pass through the transmission that server is realized information.
Described cluster judgement server is divided into two of main equipment and stand-by equipments, adopts Serial Port Line to connect between two equipment and surveys heartbeat.In case main equipment goes wrong like this, stand-by equipment automatically switches to host apparatus at once, in case it is good to detect host apparatus, then switches back again.
Passing through server can expand or reduce according to customer volume, thus the flexibility that has greatly improved system configuration.
The present invention also provides a kind of soft switching method of private network through network education training: on the basis of the underlayer soft switching platform of existing network educational training, according to what of customer volume in the zones of different server that passes through of varying number is set in each regional machine room.And have additional cluster judgement server in existing network educational training soft switching platform system core, be used to manage the server that passes through that is distributed in each zone.Cluster judgement server is responsible for the IP address field of configure user and the correspondence table of passing through server, that is to say according to IP address and selects to pass through accordingly server.Help like this selecting to pass through accordingly server, realize user's shortest path, the realization communication of best effects ground by the zone with by the load of passing through server.Each passes through server and all preserves an internal memory list item on cluster judgement server, adopt the HASH value of calculating IP address to be connected to a sign, sign points to and passes through server accordingly, but distributes a user to passing through server at every turn, and just the usage quantity with this equipment adds 1.Every is passed through server and all adopts high speed to be connected on the broadband network of operator, guarantee bandwidth at a high speed, allow virtually to create on every equipment to reach 40 most, 000 port, use for one group of user according to average every 2-4 port, every is passed through the maximum support 10 of server, 000-20,000 user concurrent.Pass through and all create the shared drive structure on the server, allow establishment process and connection process to use simultaneously.Pass through the ETHERNET interface that server uses standard, adopt ICP/IP protocol to be connected, pass through between server and the cluster judgement server and then adopt the TRANS agreement mutual communication that on the TCP/IP basis, makes up with extraneous.When customer call, select one by cluster judgement server by the condition of having set and pass through server, then this passes through server user's connectivity port situation by the TRANS protocol apprizes, passes through server and then creates 2-4 port and inform that cluster adjudicates server.In case the user tears chain open, then soft-switch platform can be adjudicated server by cluster and be informed that this passes through server and reclaims the corresponding port of creating previously.When user terminal sends information, the underlayer soft switching platform of network education training is by the underlayer soft switching platform registration of modification network education training and the processing mode of hello protocol, according to IP address, select one by cluster judgement server and pass through server, in telex network, participate in, need not support the protocol function what is special by user terminal, not need user side to place MiddleBox equipment, just can complete transparent solution penetrating through private network problem.
3, beneficial effect:
The present invention is by increasing cluster judgement server and being distributed in a plurality of servers that pass through in the different coverages on existing network educational training soft-switch platform basis, adopt ICP/IP protocol to communicate passing through between server and the user, and employing ICP/IP protocol TRANS agreement communicate between server and the cluster judgement server passing through.Such benefit is that user side need not particular protocol, also need not NAT, acting server and fire compartment wall are transformed, and just can realize that the user does caller and called under private network, saved substantial contribution and scrap build work.And pass through the big advantage of server support number of users by flexibility and the separate unit that the TRANS group system lays, the concurrent processing ability of network education training soft switching platform system is significantly improved, operator can make up whole network education training system easily, thereby make no matter the user is public and private net IP address, be under what fire compartment wall, can carry out the network education training that exchanges based on two-way video on the internet like a cork.
Four, description of drawings
Fig. 1 is the topological diagram of the underlayer soft switching platform system of private network through network education training of the present invention;
Fig. 2 is a call phase flow chart in the soft switching method;
Fig. 3 is a clearing phase flow chart in the soft switching method;
Fig. 4 is that cluster judgement server passes through the form that server sends information to this;
Fig. 5 is the information format of passing through server response cluster judgement server.
Five, embodiment
The topological diagram of private network through network education training underlayer soft switching platform as shown in Figure 1, it comprises a plurality of servers that pass through of setting up in different coverages, and the high-speed broadband networks of passing through that is positioned on the network education training Soft core platform is managed the cluster judgement server that server is passed through in each zone.
Cluster judgement hardware of server can adopt Intel P4CPU as host CPU, uses the 256Mbyte internal memory, uses the SCSI hard disk as storage medium, uses the 100Mbps network interface card as network interface.Be divided into active and standby two, adopt Serial Port Line to connect between two equipment and survey heartbeat.In case main equipment goes wrong, stand-by equipment automatically switches to host apparatus at once, in case it is good to detect host apparatus, then switches back again.
Pass through server and can adopt two Intel XEON CPU, use 1GB ECC internal memory, use the SCSI hard disk, select for use the adaptive network interface card of 100/1000M as communication interface as storage medium as host CPU.
The network site of passing through server is not to be placed on user side, but is placed on operator machine room inside.Each passes through server not only is user's service, but can serve simultaneously for reaching 1000 users.The TRANS cluster device provides the loading condition of every machine of retrieval, can expand easily or reduce and pass through server.The local area network (LAN) scope can be crossed over by TRANS cluster device system, passes through the server placement with every and manages the branch region on the internet.
On Fig. 1, passing through server is the machine room end equipment of an operator, and this operator can be a provincial operator, and a plurality of machine rooms in different cities are arranged, and how many different zones puts the server that passes through of varying number according to the user.Core is arranged on the cluster judgement server of the active and standby automatic conversion on the network education training soft switching platform system, is used to manage the server that passes through that is distributed in each zone.And user side can adopt polytype communication equipment, and the user who dials automatically as ADSL Modem uses private network IP address to adopt the NAPT technology to use the mode of network through ADSLModem.Or use fire compartment wall work agency of enterprise or NAT mode, the video telephone of enterprises, VOIP phone, PC all adopt private network IP address to connect network.Two class users above the mode all fours of the pass through private net of other use acting server etc.
Cluster judgement server is responsible for the IP address field of configure user and the correspondence table of passing through server, that is to say according to IP address and selects to pass through accordingly server.Help like this selecting to pass through accordingly server, realize user's shortest path, the realization communication of best effects ground by the zone with by the load of passing through server.
Each passes through server and all preserves an internal memory list item on cluster judgement server, adopt the HASH value of calculating IP address to be connected to a sign, sign points to and passes through server accordingly, but distributes a user to passing through server at every turn, and just the usage quantity with this equipment adds 1.
Every is passed through server and all adopts high speed to be connected on the broadband network of operator, guarantee bandwidth at a high speed, allow virtually to create on every equipment to reach 40 most, 000 port, use for one group of user according to average every 2-4 port, every is passed through the maximum support 10 of server, 000-20,000 user concurrent.
Pass through and all create the shared drive structure on the server, allow establishment process and connection process to use simultaneously.Pass through the ETHERNET interface that server uses standard, adopt ICP/IP protocol to be connected, on the TCP/IP basis, made up the TRANS agreement, be used for and cluster is adjudicated mutual communication between the server with extraneous.When customer call, select one by cluster judgement server by the condition of having set and pass through server, then this passes through server user's connectivity port situation by the TRANS protocol apprizes, passes through server and then creates 2-4 port and inform that cluster adjudicates server.If only logical sound between two users wherein, then only need to create 2 ports (being used for audio frequency RTP port and audio frequency RTCP port), if also need intervisibility frequently between two users, then need to create 4 ports (being used for audio frequency RTP port, audio frequency RTCP port, video RTP port, video RTCP port).In case the user tears chain open, then the network education training soft-switch platform can be adjudicated server by cluster and be informed that this passes through server and reclaims the corresponding port of creating previously.
When user terminal sends information, the network education training soft-switch platform is by the underlayer soft switching platform registration of modification network education training system and the processing mode of hello protocol, according to IP address, select one by cluster judgement server and pass through server, in telex network, participate in, need not support the protocol function what is special by user terminal, not need user side to place MiddleBox equipment, just can complete transparent solution penetrating through private network problem.
The detailed pass through private net flow process of user is as follows:
Register flow path: user terminal only needs to send log-on message according to normal Session Initiation Protocol, by public network address and the port numbers of receiving at the underlayer soft switching platform of network education training system from user terminal, and the variation that is encapsulated in the several territories in the Session Initiation Protocol, can know that the user is under the private network, stamps sign at the underlayer soft switching platform of network education training system with user's information.
Call flow (Fig. 2): when SIP INVITE message related to calls was sent in the user terminal caller, when perhaps external call user terminal, platform received SIP INVITE message related to calls, platform knew whether private user according to this user's sign.Select one by TRANS master's cluster decision device and pass through server, by the TRANS agreement user's situation is informed that this passes through server, this passes through server and creates corresponding RTP and RTCP port numbers, and responds the underlayer soft switching platform of giving the network education training system.Connection Service device address and port numbers that the underlayer soft switching platform of network education training system is revised in the SDP message pass to user terminal, SDP message in the 200OK response message that user terminal is responded, also can adjudicate server by cluster passes to by the TRANS agreement and passes through server accordingly, after passing through following two users' of server record data, the underlayer soft switching platform of network education training system passes to the sender after being revised as the corresponding port of passing through server, and such two users' information has just realized intercommunication by the TRANS system.
The flow process of taking out stitches (Fig. 3): when the user takes out stitches, the underlayer soft switching platform of network education training system passes through server accordingly by cluster judgement server by utilizing TRANS protocol apprizes, pass through server accordingly and discharge the port resource that has distributed, and the various list items that deletion is set up in internal memory are connected with virtual.
Adopt a Serial Port Line to carry out heartbeat detection and data passes between cluster judgement server is active and standby.Under the normal mode, TRANS cluster judgement main equipment can send an information to the auxilliary equipment of TRANS cluster by Serial Port Line every 300 milliseconds, comprise one in the information adds at every turn one ID number, in case the auxilliary equipment of TRANS cluster is not received at 500ms, then can send an inquiry message, can comprise in the information ID number that hope is received to main equipment.If main equipment is working properly, can adjust ID number the ID number transmission of oneself according to auxilliary equipment requirements, continue again later on.If auxilliary equipment does not receive the Information ID of autonomous device, then the underlayer soft switching platform of auxilliary equipment informing network educational training at once system passes through server with each, and oneself is become main equipment, sends warning information simultaneously.
Outside the TRANS cluster is adjudicated the communication that major-minor equipment undertakies by Serial Port Line, except above-mentioned normal heartbeat is surveyed, major-minor equipment also adopts the NFS network to share a partition table separately as sharing the read-write zone, under the normal condition, main equipment receives that whenever formal choosing passes through server and user's IP address information, will increase corresponding information in the zone shared the writing of auxilliary equipment, auxilliary equipment will write these information in the internal memory list item of oneself equally.
The TRANS agreement is based on the application layer protocol on the ICP/IP protocol, is used to pass through server and adjudicates communicating by letter between the server with cluster, and its specific descriptions are as follows:
Cluster judgement server is according to previously described method, from internal memory, select one pass through server after, send solicited message to these TCP 888 ports that pass through server, the form of information as shown in Figure 4, among the figure preceding 3 of first byte of Ver, being used to indicate the version number of agreement, is 1 at present, just 001; The 4th of first byte of S is used for sign and creates, and still removes, and 0 expression is created, and 1 expression is removed, back 4 of first byte of Reserve, the temporary transient reservation, expansion use waiting until after.Second byte of Key is used to pass through the index value of seeing cluster judgement server on the server.Sequence number accounts for 2 bytes, is used for cluster judgement server and passes through translation sequence number between the server.Data accounts for 8 bytes, is the data behind the employing symmetric cryptography, is used for the character (1 byte) of stored user, and whether the user supports video sign (1 byte), audio user port numbers (2 bytes), user video port numbers (2 bytes).It is that user's character has the user for which class user, and 0 expression user is pure public network user, and 1 expression user is a private user; Whether the user supports video to be masked as 1 sign and supports that 0 expression is not supported.
Passing through server receives from behind the cluster judgement server, whether the IP address of relatively receiving earlier belongs to cluster judgement server address scope, searches memory table own according to the key value again and sees whether the cluster judgement server ip address that indexes matches with the IP address of receiving.If coincide, then reexamine sequence number (sequence number) and whether differ 1 with the sequence number of itself preserving, if also coincide, then use the symmetric cryptography word of this good cluster judgement server of configured in advance to carry out deciphering at the Data territory, the content that deciphering is come out is user's a character (1 byte), whether the user supports video sign (1 byte), audio user port numbers (2 bytes), user video port numbers (2 bytes).If the front can not coincide, then pass through server and directly do not respond, can avoid forging on the Internet DoS attack behavior of address like this.
After passing through server and creating the corresponding port, sequence number added 1 after, respond cluster judgement server, information format as shown in Figure 5, among the figure preceding 3 of first byte of Ver, be used to indicate the version number of agreement, be 1 at present, just 001; The 4th of first byte of S is used for sign and creates, and still removes, and 0 expression is created, and 1 expression is removed, back 4 of first byte of Reserve, the temporary transient reservation, expansion use waiting until after.Second byte of Key is used for seeing the index value that passes through server on the cluster judgement server.Sequence number accounts for 2 bytes, is used to pass through the translation sequence number between server and the cluster judgement server.Data accounts for 8 bytes, is the data behind the employing symmetric cryptography, is followed successively by audio port number (2 bytes) after being correctly decoded, audio frequency RTCP port numbers (2 bytes), video end slogan (2 bytes), video RTCP port numbers (2 bytes).If the user does not support video, then video end slogan and video RTCP port numbers are all 0; After cluster judgement server was received echo message, whether the IP address of relatively receiving earlier belonged to the server address scope of passing through, and searched memory table own according to the key value again and saw passing through server ip address and whether matching with the IP address of receiving of indexing.If coincide, then reexamine sequence number (sequence number) and whether differ 1 with the sequence number of itself preserving, if also coincide, this good symmetric cryptography word that passes through server carries out deciphering at the Data territory then to use configured in advance, the content that deciphering is come out is to pass through the audio port number (2 bytes) of server, audio frequency RTCP port numbers (2 bytes), video end slogan (2 bytes), video RTCP port numbers (2 bytes).Cluster judgement server adopts tcp/ip message to respond this information to the network education training soft-switch platform again.
Claims (3)
1. the underlayer soft switching platform system of a private network through network education training, it comprises the underlayer soft switching platform equipment of the network education training that is used for exchanges data and processing, it is characterized in that: it also is provided with to be distributed in provides the server that passes through of communication service for the user in the different coverages, and be arranged on the cluster judgement server that server is passed through in each zone of management on the underlayer soft switching platform of network education training, described passing through between server and the user is connected by network, and adopts ICP/IP protocol to carry out data communication; Described passing through between server and the cluster judgement server is connected by high-speed wideband, and employing TRANS agreement is carried out data communication; When customer call, select one by cluster judgement server by the condition of having set and pass through server, then this passes through server user's connectivity port situation by the TRANS protocol apprizes, passes through server and then creates 2-4 port and inform that cluster adjudicates server; In case the user tears chain open, then the underlayer soft switching platform of network education training can be adjudicated server by cluster and be informed that this passes through server and reclaims the corresponding port of creating previously; When user terminal sends information, the underlayer soft switching platform of network education training is by the underlayer soft switching platform registration of modification network education training and the processing mode of hello protocol, according to IP address, select one by cluster judgement server and pass through the transmission that server is realized information.
2. the underlayer soft switching platform system of private network through network education training according to claim 1 is characterized in that: described cluster judgement server is divided into two of main equipment and stand-by equipments, adopts Serial Port Line to connect between two equipment.
3. the method for the underlayer soft switching platform of a private network through network education training: it is characterized in that: on the basis of the underlayer soft switching platform of existing network educational training, the server that passes through how many respective numbers is set in each regional machine room according to customer volume in the zones of different, and on product platform, have additional cluster judgement server, be used to manage the server that passes through that is distributed in each zone; Cluster judgement server is responsible for the IP address field of configure user and is communicated by letter to realize user's shortest path, optimum efficiency with the correspondence table of passing through server, each passes through server and all preserves an internal memory list item on cluster judgement server, adopt the HASH value of calculating IP address to be connected to a sign, sign points to and passes through server accordingly, but distribute a user to passing through server, the usage quantity that just this is passed through server adds 1 at every turn; Every is passed through server and all adopts the high speed bandwidth to be connected on the broadband network of operator, guarantees bandwidth at a high speed; Pass through and create the shared drive structure on the server, allow establishment process and connection process to use simultaneously, pass through between server and the cluster judgement server and then adopt the TRANS agreement mutual communication that on the TCP/IP basis, makes up; When customer call, select one by cluster judgement server by the condition of having set and pass through server, then this passes through server user's connectivity port situation by the TRANS protocol apprizes, passes through server and then creates 2-4 port and inform that cluster adjudicates server; In case the user tears chain open, then the underlayer soft switching platform of network education training can be adjudicated server by cluster and be informed that this passes through server and reclaims the corresponding port of creating previously; When user terminal sends information, the underlayer soft switching platform of network education training is by the underlayer soft switching platform registration of modification network education training and the processing mode of hello protocol, according to IP address, select one by cluster judgement server and pass through the transmission that server is realized information.
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| CN103152444B (en) * | 2013-03-25 | 2016-08-03 | 华为技术有限公司 | The network address translation of trunking scheme and message transmitting method and device, system |
| US10805113B2 (en) * | 2018-08-07 | 2020-10-13 | Dh2I Company | Application transmission control protocol tunneling over the public internet |
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