CN102546350B - Method and device for saving WAN (wide area network) bandwidth in IP (internet protocol) monitoring system - Google Patents
Method and device for saving WAN (wide area network) bandwidth in IP (internet protocol) monitoring system Download PDFInfo
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Abstract
The invention provides a method for saving WAN (wide area network) bandwidth in an IP (internet protocol) monitoring system. The monitoring system further comprises an EC (electronic computer), a VC (visible computer) and an LNS (L2TP (layer 2 tunneling protocol) network server), wherein at least the EC and the VC are in L2TP tunnel connection with the LNS. The method comprises the following steps: receiving registration messages sent by the EC and the VC, storing address information of EC and VC in the registration messages; after establishing a transmission channel for monitoring video streams on the L2TP between the EC and VC, issuing commands of trying to communicate with an intranet of an opposite terminal to the EC and the VC; receiving an intranet communication trying report sent by the VC, judging whether the EC can communicate with the VC through the intranet according to the address information of the report message and the self-stored address information; if so, sending a communication mode switching command to instruct the EC to switch to an intranet communication mode from the L2TP tunnel communication mode. The method can be used for effectively solving the WAN bandwidth consumption problem in a tunnel mode.
Description
Technical field
The present invention relates to field of video monitoring, relate in particular to the method and apparatus of intranet and extranet communication in IP supervisory control system.
Background technology
The video monitoring of IP based network has developed into the main flow scheme of security protection industry gradually, is successfully applied to the mega projects such as safety engineering, highway, public security net, garden.The standard of IP and opening also make the integration of each network islands become easily, make the expansion of network size become light.Consider IPv4 address resource anxiety and the overlapped reality of existing each Local Area Network address field, and diverse network security needs, the xegregating units such as NAT, fire compartment wall, safety isolation network gate are by a large amount of being applied in catenet.This just makes the signaling of IP-based video monitoring system and operation flow become very complicated, even causes some business cannot carry out in some specific networking.While there is the xegregating units such as NAT, fire compartment wall, safety isolation network gate at video surveillance network under simple elaboration below, video surveillance network communication becomes the cause of complicated difficulty.
Taking most typical NAT as example, there is NAT device in network in, because IP message can change through its source IP address after NAT device or object IP address, and monitoring business signaling message inside conventionally also bag carry source IP address and object IP address, the address disunity that causes thus message inside and outside (header), this many times can cause puzzlement to video monitoring service flow process.In addition, if NAT outer net exists equipment will first initiate to lead to the TCP/UDP connection of Intranet, must on NAT device, be first just static address/port mapping that those equipment of Intranet configure respectively internal server, obviously like this can waste a large amount of public network addresses, be also many times unallowed.Certainly, Control Server can judge two mutual equipment who in NAT Intranet who during in outer net, can notify the equipment of Intranet initiatively to initiate to connect to outer net equipment.But this requires each session connection to realize two kinds or even two or more handling processes, can become very complicated for a this combination of the operation flow that has comprised multiple session behaviors.Moreover some benchmark service does not allow mutual both sides to put upside down the role of C/S yet.
Say for another example, in the time there is fire compartment wall, need the open a considerable amount of UDP/TCP ports of fire compartment wall so that the terminal outside fire compartment wall, as video monitoring client terminal, the initiatively server in access fire-proof wall, as video management server (VM).So just bring potential safety hazard to corporate intranet.
In the time there is safety isolation network gate; the gateway of realizing with IP agent way in a large number (first sends to an Agent IP of gateway from outside flow; after gateway amendment object IP, forward toward Intranet again); conventionally can require gateway to assist the internal information of traffic signaling to make corresponding amendment, because wherein may include IP address information.So new features of the every exploitation of supervisory control system producer may all can require gateway company to coordinate and make corresponding feature development.
In addition, some special users also have special video surveillance network demand.Such as the higher network of the security requirements such as police network needs: all session connections all require to be initiated by Intranet, otherwise external flow does not just enter Intranet.In a typical centralized control framework, terminal, as encoding device, first must be to server, as video management server, initiate register command, demand (telecommunication) service is also that program request main frame is first initiated application to server, when terminal and main frame in outer net and server during in Intranet business will meet with predicament.
Summary of the invention
The monitoring video flow problem of wide area network that may detour when the object of the invention is to solve IP supervisory control system and adopts tunnel mode to pass through xegregating unit.Technical scheme of the present invention is achieved in that
The invention provides a kind of method of saving wide area network bandwidth in IP supervisory control system, the method is applied on the video management server (VM) of supervisory control system, and wherein said supervisory control system also comprises EC, VC and LNS; Wherein at least one EC and VC set up and have L2TP Tunnel to be connected with LNS, and the method comprises:
Receive the logon message that EC and VC send, the address information of EC and VC in preservation logon message;
Indicate correspondingly EC to send monitoring video flow according to the order request of VC;
Between EC and VC set up monitoring video flow transmission channel via L2TP Tunnel after, send to EC and VC the instruction of carrying out interior Network Communication trial with opposite end;
Receive the interior Network Communication trial report that VC sends, judge between EC and VC whether can communicate by Intranet according to the address information of the address information of report message and self preservation, if it is send communication pattern switching command, instruction EC is switched to Intranet communication pattern from L2TP Tunnel communication pattern.
The present invention also saves the method for wide area network bandwidth in a kind of IP supervisory control system, and it is upper that the method is applied to the EC of supervisory control system, also comprises VC, VM and LNS in wherein said supervisory control system; Wherein at least one EC and at least one VC all set up and have L2TP Tunnel to be connected with LNS, and the method comprises:
Initiate tunnel connection request to LNS, set up L2TP Tunnel with LNS and be connected;
EC is carried at the address information of self in logon message, to send to VM;
To after monitor video stream encryption, send according to the instruction of VM;
After setting up monitoring video flow transmission channel with VC by L2TP Tunnel, receive the interior Network Communication trial instruction that VM sends;
The signaling message that carries interior Network Communication trial instruction sending according to VM, attempts carrying out interior Network Communication with VC;
The in the situation that of interior Network Communication trial and success, according to the signaling message that carries communication pattern switching command sending of VM, the communication pattern between self and VC is switched to Intranet communication pattern from L2TP Tunnel communication pattern.
The present invention also saves the method for wide area network bandwidth in a kind of IP supervisory control system, and it is upper that the method is applied to the VC of supervisory control system, also comprises EC, VM and LNS in wherein said supervisory control system; The method comprises:
Initiate tunnel connection request to LNS, set up L2TP Tunnel with LNS and be connected;
VC is carried at the address information of self in logon message, to send to VM;
Send the request of the upper monitoring video flow of program request EC to VM;
After setting up monitoring video flow transmission channel with EC by L2TP Tunnel, receive the interior Network Communication trial instruction that VM sends;
In the time receiving the message that described EC sends by Intranet, send report to VM;
The in the situation that of interior Network Communication trial and success, the communication pattern between self and EC is switched to Intranet communication pattern from L2TP Tunnel communication pattern.
The present invention can be by using tunneling technique to solve dexterously the problem of Wide Area Network bandwidth consumption under tunnel mode in passing through xegregating unit, and solution scientific and precise has taken into full account that IP address the problem that objective law may cause such as repeats.
Brief description of the drawings
Fig. 1 is a kind of IP supervisory control system networking diagram that passes through xegregating unit by L2TP Tunnel;
Fig. 2 is the another kind of IP supervisory control system networking diagram that passes through xegregating unit by L2TP Tunnel;
Fig. 3 is a kind of monitor node common hardware of the present invention Organization Chart;
Fig. 4 is a kind of monitor node generic logic of the present invention structure chart.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
Fig. 1 has shown a single domain IP supervisory control system.Single domain IP supervisory control system refers in system, to only have a monitoring management territory, such system may have a lot of branching networks, but only have a branch to bear management role, more typically, the supervisory control system that only has a video management server (VM) to control, this branch being in charge of is commonly referred to central site network, except VM, can also comprise data management server DM, MS and these monitoring servers of data centralization memory device IPSAN.
The supervisory control system of Fig. 1 has comprised xegregating unit, EC, VC, VM, DM, MS and LNS service end.In supervisory control system of the present invention, EC, VC and various server are called as monitor node).In Fig. 1, branching networks EC and VC are positioned at the inner side of self network egress xegregating unit, are isolated a protected side in other words, also referred to as Intranet side.And monitoring server is the outside that is positioned at xegregating unit naturally with respect to above-mentioned xegregating unit, also referred to as outer net side.
The existence of xegregating unit causes Intranet can initiatively access outer net, is the problem that cannot access Intranet but outer net does not have under the prerequisite of particular arrangement at xegregating unit.Therefore in the present invention, first initiate tunnel connection request as L2TP client (LAC) to L2TP service end (LNS) by the monitor node of Intranet, after tunnel connects foundation, Intranet monitor terminal will obtain the internal layer IP address, tunnel of being distributed by L2TP service end.(as shown in Figure 2) in one embodiment, the IP address of this tunnel internal layer belongs to outer net.That is to say that the monitor node of Intranet has had the IP address of outer net, therefore it can communicate in IP aspect with outer net.In another embodiment, Intranet monitor node and outer net monitor node all obtain internal layer IP address, tunnel from the absolute address pond of LNS service end, this address pool is independent of Intranet and outer net, and this IP address planning that can not upset outer net, greatly reduces client's network management puzzlement.
Please refer to Fig. 2 and Fig. 3, below introduce the flow process that monitor node communicates by tunnel, the present invention is referred to as tunnel communication pattern.
Shown in Fig. 2 is that the internal layer IP address, tunnel that Intranet monitor node (taking VC as LAC client as example) is assigned to is the situation of outer net IP address.The IP address of VC in Intranet is 10.10.10.10/24), its LAC initiates dial-up connection startup L2TP Tunnel to the L2TP service end of outer net and obtains internal layer IP address, tunnel.Be positioned at the LNS of outer net and the IP address of Intranet connecting interface is 12.12.10.10/24, this address is a public network address from the angle of Intranet, that is to say it is that Intranet can directly be accessed; If this address can not directly be had access to, the corresponding public network address of configuring static mapping on the xegregating unit that can export in present networks.In tunnel communication pattern, it is outer IP address, tunnel.The interface IP address of LNS and other equipment connections of outer net is 12.12.12.9/24.It should be noted that, public network address and private net address are comparatively speaking, and it depends on the planning of network, such as the public network IP address on the Internet also can have been planned that being used as private net address reuses.
LNS gives and initiates the LAC distributing IP address that L2TP Tunnel connects from address pool 12.12.11.0/24, as the IP address assignment of 12.12.11.10/24 given LAC as its internal layer IP address, tunnel.EC11 adopts the IP address 12.12.11.10/24 being newly assigned to communicate by the VM of tunnel and outer net.The channel message that tunnel communication pattern is used please refer to the message packaging model shown in table 1.
| Outer DIP | Outer SIP | Internal layer DIP | Internal layer SIP | Monitoring signaling data or business datum |
Table 1
Upper table ectomesoderm DIP represents the outer IP destination address in tunnel (as 12.12.10.10/24), outer SIP represents the outer source address in tunnel (as 10.10.10.10/24), internal layer DIP represents internal layer object IP address, tunnel (as 12.12.12.9/24), and internal layer SIP represents tunnel internal layer source IP address (as 12.12.11.10/24).
A kind of general underlying hardware framework that Figure 3 shows that the various monitor nodes of the present invention, the present invention can realize by computer program on the basis of this hardware structure.In the execution mode of realizing at computer program, the structure chart of logic device of the present invention can be summarized as the structure shown in Fig. 4, it comprises Service Processing Unit, Signaling Processing Unit, tunnel processing unit and network interface unit, and the logical construction of various monitor nodes and function are slightly variant.
Network interface unit is responsible for receiving and dispatching message by IP network.Service Processing Unit is mainly responsible for processing monitoring business data, the upper Business Processing of EC comprises encodes the monitoring video flow of camera, after the data after coding being submitted to the tunnel upper internal layer IP heading of processing unit encapsulation and outer IP heading, sends by network interface unit.And the upper Business Processing of VC mainly comprises the monitoring video flow the receiving processing of decoding, be then shown to user by display terminal.The Signaling Processing Unit of EC and VC, is mainly responsible for processing signaling business, namely usually said service control, such as and VM between Signalling exchange, or control the mutual of message between EC and VC.If obviously monitor node is the such management server of VM or DM, conventionally do not comprise Service Processing Unit.If VM does not have to set up and have tunnel to be connected between LNS, tunnel processing unit neither be necessary so.
Tunnel processing unit, is mainly used in initiating tunnel connection request to LNS, sets up L2TP Tunnel and is connected, then sending and receiving channel message on tunnel with LNS.In tunnel communication pattern, on receive direction, LAC can receive channel message from LNS direction, the channel message of receiving is carried out tunnel decapsulation processing by tunnel processing unit, on sending direction, tunnel processing unit sends after being responsible for encapsulating data tunnel internal layer IP heading and outer IP heading.After LNS receives this channel message, obtain tunnel internal layer message by decapsulation, then according to the object IP address of tunnel internal layer message, give corresponding monitor node by tunnel internal layer message repeating, this is the communication process (situation shown in Fig. 2) that arrives outer net from Intranet.If be that tunnel is connected (situation as shown in Figure 1) between the monitor node of outer net and LNS, LNS is before forwarding, also need to encapsulate the IP message obtaining as tunnel internal layer message using connecing, in encapsulation, after the outer heading in tunnel, send to again the monitor node of Intranet by tunnel.
Please refer to Fig. 1, in tunnel communication pattern, if the view data on VC2 program request EC, order request can be delivered to EC by L2TP Tunnel, and EC is encapsulated in monitor video flow data (business datum) in message and sends to VC2 by tunnel again.The existence in tunnel can allow VC2 pass through xegregating unit like a cork, realizes the access from outer net to Intranet.Because the order request of VC all needs the control through VM, if VC1 is the monitoring video flow on program request EC also, now VC1 uses the internal layer IP address, tunnel being assigned to first order request to be sent on the VM of outer net by tunnel, the words that VM accepts this order request can generate corresponding monitoring business signaling message, are encapsulated in and in tunnel, are sent to EC by LNS.EC receives after this signaling message, by tunnel, business datum is sent to (can be direct transmission, can be also to forward by MS) to program request person equally.But EC and VC1 be originally in same branching networks, in fact EC does not need to send monitor video flow data by tunnel.But in order to complete the whole network for passing through of xegregating unit when tunnel communication pattern, the central site network that detours of the monitor video flow data process of passing through tunnel on EC is got back to VC1.Often need through wide area network through central site network, the bandwidth of wide area network is normally limited, and the bandwidth that monitor video flow data need to take is very high, and this can cause very large pressure to the WAN outlet of supervisory control system.The present invention is by processing cleverly to avoid the generation of said circumstances, thereby reaches the object of saving wide area network bandwidth.It should be noted that, the basic realization of the tunnel communication pattern of more than introducing, the present invention does not pay close attention to the realization of more diverse tunnel communication, but improves the problem of the wide area network bandwidth consumption that may cause under tunnel communication pattern, and this is a common problem under tunnel communication pattern.More realizations about tunnel communication pattern and variation, the related application that those of ordinary skill in the art can application reference people submit to Patent Office on the same day.
Please refer to Fig. 3 and Fig. 4, below introduce the present invention and how to realize wide area network bandwidth conservation.The processing of following control plane is by the Signaling Processing Unit processing of each monitor node, relate to that channel message sends by tunnel processing unit, relate to monitoring video flow processing by business unit processing; But do not need process of passing through tunnel processing unit by interior Network Communication.
Step 101, VC and EC register on VM by L2TP Tunnel, and VC and EC, except register the internal layer IP address, tunnel that uses LNS to distribute, then carry the source IP address of local device in the load of logon message with notice VM;
If the source IP address of EC client in Intranet is 10.1.1.2 (option), the L2TP Tunnel internal layer IP address of application is 192.168.1.2; The client source IP address of VC in Intranet is 10.1.1.3 (option), and the L2TP Tunnel internal layer IP address of application is 192.168.1.3.
Step 102:VM is after tunnel receives registration message, under the address information recording that equipment is carried in logon message;
Step 103:VC is by the monitoring video flow of tunnel program request EC: now VC still sends order request according to aforementioned tunnel communication pattern to VM;
Step 104:VM notice EC sends monitoring video flow;
Step 105: after service transmission channels being set up by tunnel between EC and VC, in VM initiatively sends to EC and VC equipment, Network Communication is attempted instruction, this instruction is carried in the keep-alive message of monitor terminal node and VM in keep-alive message.
It should be noted that, under tunnel communication pattern, first service transmission channels is set up to the fluency that can ensure business, when beginning, EC and VC can set up service transmission channels certainly according to tunnel communication pattern, contribute to ensure the experience of VC end subscriber.
The interior Network Communication that step 106:EC receives VM attempt first initiating to the other side after instruction in Network Communication; VC and EC that interior Network Communication is attempted instruction are called T-VC and T-EC by the present invention.
T-EC and T-VC can send message by proprietary protocol and carry out interior Network Communication; Such as T-EC start to attempt using the IP address of internal network of T-VC for destination address sends specific message to T-VC; Can certainly first be initiated by VC side.
Step 106: if if VC receives the message that EC sends, by the report the test of receiving to VM; VC can adopt sip message report.
Step 107: the interior Network Communication that carries that receives VC transmission is attempted report, judge between EC and VC whether can communicate by Intranet according to the address information of the address information of report message and self preservation, if it is send communication pattern switching command to EC and be switched to Intranet communication pattern with instruction EC from L2TP Tunnel communication pattern.
VM receives after the report (can carry by sip message) of VC transmission, judge according to the report of VC whether T-EC and T-VC can carry out interior Network Communication, if notice EC and VC are switched to Intranet communication pattern (private network communication pattern in other words, the IP address of internal network by the object IP address switchover of Business Stream to VC) from tunnel communication pattern; Do not process otherwise return, T-EC and T-VC continue to keep tunnel communication pattern.In step 107 of the present invention VM judge both sides can carry out interior Network Communication according to comprising two two kinds of foundations according to actual conditions, these two foundations can combine enforcement and also can implement separately.
According to 1: the internal layer IP address, tunnel that sends the VC of report must be identical with T-VC.
VM checks the internal layer IP address, VC tunnel and T-VC whether identical of self preserving that send report, be if it is judged to be can in Network Communication, otherwise be judged to be cannot interior Network Communication.Consider that IP address may be reused in different Intranets, VM receives that report that VC sends can only illustrate that the communication message that EC sends by Intranet received by the VC of same address.T-VC carries out service communication by tunnel to suppose T-EC to be 10.1.1.3 with address, if T-VC really and EC in identical Intranet, T-VC can receive that then the Intranet communication information of such EC reports VM.But suppose that T-VC and EC, in different Intranets, are also 10.1.1.3 and just there is the address of a VC2 in the Intranet of T-EC place, VC2 also can receive the information of EC, and it also can report to VM, if now VM does not judge, may cause makeing mistakes.VM checks that whether the internal layer IP address, tunnel of the VC that sends this report is identical with the internal layer IP address, tunnel of the T-VC self preserving, if it is explanation report is that T-VC sends really, otherwise illustrate that sending the VC reporting is the VC in other networks, just both sides' IP address of internal network is identical by chance.Determine when two known nodes in IP address can carry out IP communication the inspection technology such as the most frequently used machine-processed use Ping.But the present invention considers the situation introducing VM that IP address may duplicate in different Intranets and judges the mistake of having avoided IP address to repeat to cause.Namely why the present invention simply adopts the comparatively common technology such as such as Ping to check whether EC and VC can carry out the basic reason of interior Network Communication for this.
Internal layer IP address, tunnel according to the EC in the report of 2:VC is identical with T-EC.
If VC is T-VC really, can avoid to a great extent erroneous judgement.But for the purpose of more rigorous, VM can also check whether the EC in VC report is the T-EC that is carrying out service communication with T-VC, be if it is judged to be can in Network Communication, otherwise be judged to be to carry out interior Network Communication.Considering may have the current all instructions of Network Communication trial in carrying out of the combination of T-EC1/T-VC1 and T-EC2/T-VC2 in section at one time, in order further to improve preciseness, when VC is confirmed as T-VC1, the address of EC in all right report that further checks T-VC1 of VM, if the internal layer IP address, tunnel of EC of carrying in report is the same with the internal layer IP address, tunnel of T-EC2, illustrate that T-VC1 receives Intranet communication information from T-EC1, T-VC1 and T-EC1 in same Intranet, cannot carry out interior Network Communication, T-EC1/T-VC1 continues to keep tunnel communication pattern.If the internal layer IP address, tunnel of EC of carrying in same report is the same with the internal layer IP address, tunnel of T-EC2, VM notice T-EC1 and T-VC1 are switched to Intranet communication pattern.
Step 108:EC receives that VM is switched to after the instruction of Intranet communication pattern, is switched to Intranet IP communication pattern from tunnel communication pattern, and the IP address of internal network of the object IP address amendment VC that sends Business Stream (being monitoring video flow) is sent.
Incorporated by reference to Fig. 3, be switched to Intranet IP communication pattern from tunnel communication pattern, also Signaling Processing Unit is exactly that service control processing unit switches out from tunnel processing unit by the flow direction of Business Stream, makes no longer process of passing through tunnel processing of Business Stream.Business Stream is switched to Intranet from tunnel, can save to a great extent the valuable bandwidth of wide area network, has utilized rationally and effectively the existing Intranet communication resource, and its meaning of especially large-scale monitor network is more great.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (18)
1. in IP supervisory control system, save a method for wide area network bandwidth, the method is applied on the video management server (VM) of supervisory control system, and wherein said supervisory control system also comprises encoding terminal EC, monitor client VC and L2TP service end LNS; Wherein at least one EC and VC set up and have L2TP Tunnel to be connected with LNS, and the method comprises:
Receive the logon message that EC and VC send, the address information of EC and VC in preservation logon message;
Indicate correspondingly EC to send monitoring video flow according to the order request of VC;
Between EC and VC set up monitoring video flow transmission channel via L2TP Tunnel after, send to EC and VC the instruction of carrying out interior Network Communication trial with opposite end;
Receive the interior Network Communication trial report that VC sends, judge between EC and VC whether can communicate by Intranet according to the address information of the address information of report message and self preservation, if it is send communication pattern switching command, instruction EC is switched to Intranet communication pattern from L2TP Tunnel communication pattern.
2. the method for claim 1, wherein said address information comprise L2TP Tunnel internal layer IP address with; Wherein VM judge EC and VC can carry out interior Network Communication according to comprising:
The internal layer IP address, tunnel that sends the VC of report is identical with its internal layer IP address, tunnel letter that VM preserves; And/or
The internal layer IP address, tunnel of EC in the report that VC sends is identical with its internal layer IP address, tunnel letter that VM preserves.
3. the method for claim 1, also comprises: initiate tunnel connection request to LNS, set up L2TP Tunnel and be connected, then sending and receiving channel message on tunnel with LNS.
4. method as claimed in claim 2, wherein said interior Network Communication is attempted instruction and is carried between monitor terminal node and VM in keep-alive message, and described interior Network Communication is attempted report and is carried in sip message.
5. the video management server (VM) being applied in IP supervisory control system, also comprises encoding terminal EC, monitor client VC and L2TP service end LNS in wherein said supervisory control system; Wherein at least one EC and at least one VC all set up and have L2TP Tunnel to be connected with LNS, and this server comprises:
Network interface unit, for receiving and dispatching message by IP network;
Signaling Processing Unit, for preserving EC and the EC of VC logon message and the address information of VC, and indicates correspondingly EC to send monitoring video flow according to the order request of VC; This Signaling Processing Unit be further used between EC and VC set up monitoring video flow transmission channel by L2TP Tunnel after send to EC and VC the instruction of carrying out interior Network Communication trial with opposite end; And the interior Network Communication sending according to VC is attempted the address information of report message and the address information of self preservation judges between EC and VC whether can communicate by Intranet, if it is send communication pattern switching command, instruction EC is switched to Intranet communication pattern from L2TP Tunnel communication pattern.
6. server as claimed in claim 5, wherein said address information comprise L2TP Tunnel internal layer IP address with; Wherein Signaling Processing Unit judge EC and VC can carry out interior Network Communication according to comprising: the internal layer IP address, tunnel of VC and its internal layer IP address, tunnel letter of VM preservation of sending report are identical; And/or
The internal layer IP address, tunnel of EC in the report that VC sends is identical with its internal layer IP address, tunnel letter that VM preserves.
7. server as claimed in claim 5, also comprises: tunnel processing unit, initiate tunnel connection request to LNS, and set up L2TP Tunnel with LNS and be connected, then sending and receiving channel message on tunnel.
8. server as claimed in claim 6, wherein said interior Network Communication is attempted instruction and is carried between monitor terminal node and VM in keep-alive message, and described interior Network Communication is attempted report and is carried in sip message.
9. in IP supervisory control system, save a method for wide area network bandwidth, the method is applied on the encoding terminal EC of supervisory control system, also comprises monitor client VC, VM and L2TP service end LNS in wherein said supervisory control system; Wherein at least one EC and at least one VC all set up and have L2TP Tunnel to be connected with LNS, and the method comprises:
Initiate tunnel connection request to LNS, set up L2TP Tunnel with LNS and be connected;
EC is carried at the address information of self in logon message, to send to VM;
To after monitor video stream encryption, send according to the instruction of VM;
After setting up monitoring video flow transmission channel with VC by L2TP Tunnel, receive the interior Network Communication trial instruction that VM sends;
The signaling message that carries interior Network Communication trial instruction sending according to VM, attempts carrying out interior Network Communication with VC;
The in the situation that of interior Network Communication trial and success, according to the signaling message that carries communication pattern switching command sending of VM, the communication pattern between self and VC is switched to Intranet communication pattern from L2TP Tunnel communication pattern.
10. method as claimed in claim 9, wherein said interior Network Communication is attempted instruction and is carried between EC and VM in keep-alive message.
Encoding terminal EC in 11. 1 kinds of IP supervisory control systems, also comprises monitor client VC, VM and L2TP service end LNS in wherein said supervisory control system, this EC comprises: tunnel processing unit, Signaling Processing Unit and Service Processing Unit; It is characterized in that:
Tunnel processing unit, initiates tunnel connection request to LNS, sets up L2TP Tunnel and is connected, then sending and receiving channel message on tunnel with LNS;
Service Processing Unit, encodes and processes and the monitoring video flow after coding is sent monitoring video flow for carrying out;
Signaling Processing Unit, for after setting up monitoring video flow transmission channel with VC by L2TP Tunnel, receives the interior Network Communication trial instruction that VM sends; And the signaling message that carries interior Network Communication trial instruction sending according to VM, attempt carrying out interior Network Communication with VC; Wherein this Signaling Processing Unit is further used for the in the situation that of interior Network Communication trial and success, according to the signaling message that carries communication pattern switching command sending of VM, the communication pattern between self and VC is switched to Intranet communication pattern from L2TP Tunnel communication pattern.
12. EC as claimed in claim 11, wherein said interior Network Communication is attempted instruction and is carried between EC and VM in keep-alive message.
In 13. 1 kinds of IP supervisory control systems, save the method for wide area network bandwidth, the method is applied on the monitor client VC of supervisory control system, also comprises encoding terminal EC, VM and L2TP service end LNS in wherein said supervisory control system; The method comprises:
Initiate tunnel connection request to LNS, set up L2TP Tunnel with LNS and be connected;
VC is carried at the address information of self in logon message, to send to VM;
Send the request of the upper monitoring video flow of program request EC to VM;
After setting up monitoring video flow transmission channel with EC by L2TP Tunnel, receive the interior Network Communication trial instruction that VM sends;
In the time receiving the message that described EC sends by Intranet, send report to VM;
The in the situation that of interior Network Communication trial and success, the communication pattern between self and EC is switched to Intranet communication pattern from L2TP Tunnel communication pattern.
14. methods as claimed in claim 13, wherein said interior Network Communication is attempted instruction and is carried between VC and VM in keep-alive message, and described report is carried in sip message.
15. methods as claimed in claim 13, also comprise: the monitoring video flow receiving is decoded.
Monitor client VC in 16. 1 kinds of IP supervisory control systems, also comprises encoding terminal EC, VM and L2TP service end LNS in wherein said supervisory control system, this VC comprises: tunnel processing unit and Signaling Processing Unit; It is characterized in that:
Tunnel processing unit, initiates tunnel connection request to LNS, sets up L2TP Tunnel and is connected, then sending and receiving channel message on tunnel with LNS;
Signaling Processing Unit, for after setting up monitoring video flow transmission channel with EC by L2TP Tunnel, receives the interior Network Communication trial instruction that VM sends; And send report to VM in the time receiving the message that described EC sends by Intranet; Described Signaling Processing Unit, is further used for the in the situation that of interior Network Communication trial and success, and the communication pattern between self and EC is switched to Intranet communication pattern from L2TP Tunnel communication pattern.
17. VC as claimed in claim 16, wherein said interior Network Communication is attempted instruction and is carried between VC and VM in keep-alive message, and described report is carried in sip message.
18. VC as claimed in claim 16, also comprise: Service Processing Unit, and for the monitoring video flow receiving is decoded.
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| PCT/CN2013/071395 WO2013117154A1 (en) | 2012-02-10 | 2013-02-05 | Method and device for passing through isolation device in monitoring network |
| US14/377,814 US9215215B2 (en) | 2012-02-10 | 2013-02-05 | Method and device for passing through isolation device in surveillance network |
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| US9215215B2 (en) * | 2012-02-10 | 2015-12-15 | Zhejiang Uniview Technologies Co., Ltd | Method and device for passing through isolation device in surveillance network |
| CN102917071B (en) * | 2012-10-31 | 2016-06-08 | 浙江宇视科技有限公司 | A kind of tunnel connection request distribution method and device |
| CN103841627B (en) * | 2012-11-22 | 2017-12-12 | 中国电信股份有限公司 | The method and system of Operator Specific Service is used by Virtual Private Dialup Network |
| CN102984031B (en) * | 2012-12-12 | 2015-06-10 | 浙江宇视科技有限公司 | Method and device for allowing encoding equipment to be safely accessed to monitoring and control network |
| CN103873444B (en) * | 2012-12-14 | 2017-12-19 | 中国电信股份有限公司 | Method, the business switching device of outer network service are accessed when mobile terminal VPDN is online |
| CN108206938B (en) * | 2016-12-20 | 2021-01-29 | 成都鼎桥通信技术有限公司 | Video distribution method of public security information network |
| CN111770067B (en) * | 2020-06-12 | 2022-07-19 | 浪潮通用软件有限公司 | Security video acquisition method, device and system based on Internet of things |
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