CN103873301A - System and method for automatically finding and adding devices - Google Patents
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Abstract
The invention provides a system and method for automatically finding and adding devices. The method includes the steps that a main control device sends multicast detection messages; an slave device receives the detection messages and sends multicast response messages for responding to the detection messages; after the main control device receives the response messages, whether an IP address of the slave device and a self IP address are located in a same network segment or not is judged according to the response messages, the IP address of the slave device is added into a preset control list if the IP address of the slave device and the self IP address are located in the same network segment, and multicast mending messages are sent if the IP address of the slave device and the self IP address are not located in the same network segment; the slave device receives the mending messages, an original IP address is mended into a new IP address according to the mending messages when an MAC address in the mending messages is a self MAC address. By means of the technical scheme, the problem that the main control device cannot find the slave device under the condition of across-network-segment can be effectively solved.
Description
Technical field
The present invention relates to networking technology area, relate in particular to the system and method for a kind of automatic discovery and interpolation equipment.
Background technology
The development of network technology is now more and more rapider, and in order effectively to utilize Internet resources, minority main control device is widely used with the networking model that a large amount of slaves are used in conjunction with.Generally, normally find slave by main control device by network, then the IP address of slave is added to and control in list, thereby realize, slave is carried out to control and management.Taking Video Supervision Technique as example, web camera (IPC) just belongs to above-mentioned pattern with the monitoring networking of network video machine (NVR).In actual application, need workmen to have certain use experience to network, when NVR finds after IPC by proprietary protocol or standard agreement, can revise by hand the IP address of IPC, and add in the control list of NVR, this interpolation IPC controls method the having relatively high expectations to workmen of list to NVR.And when IPC and NVR be not during at the same network segment, NVR just cannot find IPC, also just cannot managing I PC.
Summary of the invention
In view of this, the network system that the invention provides a kind of automatic discovery and add the network equipment, this system comprises main control device and slave, described main control device and described slave are in same multicast group, wherein:
Described main control device, be used for sending multicast probe messages, and respond after the response message of described probe messages at reception slave, judge that according to this response message the IP address of described slave and the IP address of self are whether at the same network segment, if, the IP address of described slave is added in default control list, if not, send multicast amendment message; Wherein, described amendment message comprises MAC Address and the new IP address of slave, and the IP address of new IP address and described main control device is in the same network segment;
Described slave, the probe messages sending for receiving main control device, and send it back should probe messages multicast response message, and receive main control device send amendment message, in the time that the MAC Address in described amendment message is self MAC address, according to this amendment message, new IP address is revised as in self former IP address.
A kind of method that the present invention also provides automatic discovery and adds equipment, described method comprises:
Steps A, main control device sends multicast probe messages;
Step B, slave receives probe messages, and send it back should probe messages multicast response message;
Step C, main control device is receiving after response message, judges that according to this response message whether the IP address of described slave and the IP address of self are at the same network segment, if, the IP address of described slave is added in default control list, if not, send multicast amendment message; Wherein, described amendment message comprises MAC Address and the new IP address of slave, and the IP address of new IP address and described main control device is in the same network segment;
Step D, slave receives amendment message, in the time that the MAC Address in described amendment message is self MAC address, according to this amendment message, IP address is revised as in former IP address.
In technical scheme provided by the invention, slave responds by sending multicast response message the probe messages that main control device sends, then main control device is modified to the IP address of slave by sending multicast amendment message, make the IP address of this slave and the IP address of main control device in the same network segment, and then overcome the in the situation that of cross-network segment, main control device cannot be found the problem of slave.
Brief description of the drawings
Fig. 1 is a kind of typical system configuration schematic diagram provided by the invention.
Fig. 2 is the handling process schematic diagram in a kind of execution mode provided by the invention.
Fig. 3 is a kind of NVR and the networking schematic diagram of IPC when without switch in the embodiment of the present invention.
Fig. 4 is a kind of NVR and the networking schematic diagram of IPC in the time having switch in the embodiment of the present invention.
Embodiment
The invention provides a kind of network system and method for discovering network equipment, in order to solve in prior art, when main control device and slave be not during at the same network segment, main control device cannot be found slave, and then the problem of uncontrollable management slave.In a preferred embodiment, the network system of described discovering network equipment comprises main control device and several slaves, described main control device is by the IP address of Network Capture slave, and added to and controlled in list, thereby this slave is carried out to control and management, and described main control device and described slave are in same multicast group.Wherein, described main control device, be used for sending multicast probe messages, and respond after the response message of described probe messages at reception slave, judge that according to this response message whether the IP address of described slave and the IP address of main control device are at the same network segment, if so, the IP address of described slave is added to and control in list, if not, send multicast amendment message; Described slave, the probe messages sending for receiving main control device, and send it back should probe messages multicast response message, and receive main control device send amendment message, in the time that the MAC Address in described amendment message is self MAC address, according to this amendment message, new IP address is revised as in self former IP address.
As shown in Figure 1, above-mentioned main control device and slave cooperatively interact system configuration provided by the invention, carry out following handling process, as shown in Figure 2.
Step 1, main control device sends multicast probe messages.
Because technical scheme provided by the invention is cooperatively interacted and then realized by main control device and slave, so in order to implement smoothly technical scheme provided by the invention, conventionally main control device and slave are arranged in same multicast group, and a multicast ip address and a multicast mac address are set for this multicast group.
Wherein, described multicast is and clean culture and broadcast communication mode arranged side by side, it can solve effectively, and single-point sends, the problem of multipoint reception, thereby realized efficient data transmission point-to-multipoint in network, can save a large amount of network bandwidths, reduce offered load.Specifically, multiple host adds same multicast group, in the time that a certain main frame sends message as multicast source to multicast group, this main frame only need send a message, router in network can copy and forward this information according to the distribution situation of each member in this multicast group, and finally this information can send to other main frames in multicast group exactly.And described multicast group is a recipient set identifying with IP multicast address, main frame is by adding certain multicast group to become the member of this multicast group, thereby can receive the multicast packet that mails to this multicast group.
In addition, described main control device is generally NVR, and described slave is generally IPC, next describes as an example of the monitoring networking of NVR and IPC example.NVR as main control device can be according to ONVIF(Open Network Video Interface Forum, opening Internet video interface forum) message format that specifies in agreement, send UDP(User Datagram Protocol, User Datagram Protoco (UDP)) multicast message PROBE(detector), namely send multicast probe messages, to survey the IPC finding as slave.Because IPC has multiplely conventionally, and in same multicast group, so NVR only need send a multicast probe messages to this multicast group, all IPC in multicast group just can receive this probe messages.IPC has a fixed port conventionally for receiving group message, for example, set fixed port 3702 for receiving group message, and IPC, in the time adding multicast group, will open port 3702 so, has used receiving group message.And NVR is in the time sending multicast message, will take multicast group IP address as object IP address, taking port 3702 as destination interface, IPC just can receive the multicast message that NVR sends by port 3702 like this.Here it should be noted that the carrying out in order not affect other business, port used is generally idle port here.
Here also it should be noted that, in order to find accurately slave, main control device can periodically send multicast probe messages conventionally.In addition, cycle duration can arrange as required, conventionally needs the performance of consideration equipment and network.Because if the cycle duration arranging is too short, main control device needs frequent transmission multicast probe messages, and slave also will receive this message frequently, has so just increased the operating pressure of equipment and network; If but the cycle time arranging long, main control device just cannot be found the situation of change of slave in time, for example, have new slave to add etc.Therefore, in a preferred embodiment, cycle duration is set to 3 to 5 minutes conventionally.
Step 2, slave receives probe messages, and send it back should probe messages multicast response message.
As described above, because slave is in described multicast group, so can receive main control device and be sent to the probe messages of multicast group.Slave is receiving after probe messages, can send it back should probe messages multicast response message.
In the prior art, slave normally sends clean culture response message and responds probe messages, if but slave and main control device are in the different network segments, the clean culture response message that slave sends so, and main control device probably cannot receive.Taking the monitoring networking of NVR and IPC as example, explain main control device in the situation that of cross-network segment below, may not receive the reason of clean culture response message.
Suppose an existing NVR as main control device and two each and every one as the IPC of slave, i.e. IPC1 and IPC2, wherein IPC1 and NVR are in the same network segment, and IPC2 and NVR be in different segment, meanwhile, NVR, IPC1 and IPC2 are in a multicast group.After NVR start, can send one time multicast probe messages every 3 minutes, the IPC1 in multicast group and IPC2 can receive this probe messages.Then IPC1 and IPC2 can send clean culture response message to respond this probe messages.But because IPC1 and NVR are in the same network segment, IPC1 is receiving after probe messages, source MAC, source IP address and port numbers in message can be recorded in ARP list item, then by the record in ARP list item, send response message to NVR.And IPC2 and NVR be in different segment, IPC2 is receiving after probe messages, the source MAC in message, source IP address and port numbers can be recorded in ARP list item, that is to say, there is no the IP address of NVR and the record of MAC Address in ARP list item.Therefore, if IPC2 wants to send message to NVR, object IP address in message and target MAC (Media Access Control) address cannot be filled in IP address and the MAC Address of NVR, because search IP address and MAC Address less than NVR in ARP list item, so IPC2 can fill in the object IP address in message and target MAC (Media Access Control) address object IP address and the target MAC (Media Access Control) address of gateway, thereby this message is sent to gateway, is forwarded by gateway.But due in the monitoring networking of NVR and IPC, normally there is no gateway, IPC is directly connected with the NVR with switch function, or is connected with NVR by small switch, as shown in Figure 3 and Figure 4.Therefore, the clean culture response message that IPC2 sends cannot be by gateway forwards to NVR, so NVR does not just receive the clean culture response message that IPC2 sends.
Technical scheme provided by the invention just can well overcome above-mentioned shortcoming of the prior art, can know and find out by step 2, slave sends it back the multicast response message of answering probe messages, and multicast response message can be in the situation that not having gateway, and cross-network segment sends.Continue below to describe as an example of the monitoring networking of above-mentioned NVR and IPC example.In the time that IPC2 transmission multicast response message is responded probe messages, due to NVR, IPC1 and IPC2 are in a multicast group, and multicast group has multicast ip address and multicast mac address, so IPC2 can send response message as object IP address and target MAC (Media Access Control) address using this multicast ip address and multicast mac address, NVR just can receive the response message that IPC2 sends like this.
It should be noted that, the clean culture response message that in the multicast response message that slave of the present invention sends and prior art, slave sends is by essential difference, although prior art also can be responded the multicast probe messages that main control device sends, even at the very start the IP address of slave and main control device being arranged in the same network segment, but this is all the man-to-man response mode of simple application, namely " I want whom answers; I am just to whose literary composition of transmitting messages ", this is the technology thinking of a kind of inertia of those skilled in the art.And the multicast response message that in the present invention, slave sends, be no longer man-to-man response mode, that is to say, from formal, slave no longer sends response message taking main control device as answering object, and this response message can send to each member in multicast group.Technical scheme provided by the invention has overcome the shortcoming that original response mode is one to one brought, and the in the situation that of cross-network segment, with sending the mode of multicast message, the response message of slave is sent to main control device.
Here also it should be noted that, if described slave had sent the multicast response message in order to reply probe messages, in the time that slave receives probe messages again, generally no longer reply so.
Step 3, main control device, receiving after response message, judges that according to this response message whether the IP address of described slave and the IP address of main control device are at the same network segment, if, the IP address of described slave is added to and control in list, if not, send multicast amendment message.
As shown in the above, main control device can receive the response message of the slave transmission of cross-network segment and same network segment, therefore, main control device is receiving after response message, first should judge that whether IP address and self IP address of the slave that sends this response message are at the same network segment, so that further processing.For with self slave of IP address in the same network segment, main control device can add the IP address of this slave to be controlled in list, to it is carried out to control and management in the future.And for self slave of IP address in different segment, main control device can send multicast amendment message, so that this slave, according to amendment message, is modified its former IP address, make the IP address of amended IP address and main control device in the same network segment.
Owing to need sending message to certain slave when main control device, while carrying out associative operation with this slave of control and management, the IP address that main control device can be searched this slave from control list, from ARP list item, find again its corresponding MAC Address, then send unicast message to this slave.Therefore, main control device need will be modified in the IP address of the slave of different segment with its IP address, otherwise main control device cannot send unicast message to this slave.If but main control device is managed certain slave by multicast message all the time, will redefine so the form of all messages, make other members in multicast group, can clearly tell this message and whether send to oneself, so just improved technical difficulty, be also unfavorable for prior art compatible mutually.So main control device under normal circumstances, needs to send amendment message, in order to amendment with main control device not in the IP address of the slave of the same network segment, to send unicast message in the future, manage control.
Taking the monitoring networking of NVR and IPC as example, be specifically described.Send PROBE MACTH(and survey coupling receiving slave IPC as the NVR of main control device) message, after the response message that namely slave IPC sends, can first judge the IP address of IPC of this response message of transmission and self whether in the same network segment.If the IP address of this IPC and NVR are in the same network segment, NVR automatically adds the IP address of this IPC to control in list to.If the IP address of this IPC and NVR be not in the same network segment, NVR can select the IP address of and the own same network segment, and new IP address using this IP address as IPC is carried in the amendment message by its structure.Under normal circumstances, described amendment message comprises the new IP address that NVR selects, and the MAC Address of the IPC that need to modify.
Step 4, slave receive amendment message, in the time that the MAC Address in described amendment message is self MAC address, according to this amendment message by former IP address.
Due to the received amendment message of slave, be the multicast message that main control device sends, so need first judging this amendment message, slave whether sends to oneself.Concrete, described amendment message can comprise the MAC Address of the slave that need to modify, and new IP address, and the IP address of new IP address and main control device is at the same network segment.Slave receives after this amendment message, first the MAC Address of carrying in the MAC Address of self and amendment message is compared, if comparing result is consistent, illustrates that this amendment message is that main control device sends to oneself.This slave can be revised as self original IP address entrained new IP address in amendment message so.If the MAC Address of self is inconsistent with the result of revising the MAC Address contrast of carrying in message, this slave can abandon described amendment message conventionally so.In addition, because change has occurred in the IP address of slave, default gateway and the subnet mask of place, the so former IP address network segment just cannot be used, so in order to allow slave continue and network link, former default gateway and subnet mask also will be modified, to ensure that it can UNICOM's network.So described amendment message, except comprising MAC Address and new IP address, can also comprise new default gateway and new subnet mask, modifies for slave.
Here it should be noted that, described amendment message, except comprising MAC Address mentioned above, new default gateway, new subnet mask, new IP address, can also need the former IP address of the slave of modifying, and confirms in order to further comparison.But in a preferred embodiment, generally only contrast MAC Address, this is because the MAC Address of slave is normally changeless, but IP address likely changes, so conventionally taking contrast MAC Address as main.Certainly, amendment message can also comprise that other are for distinguishing other marks of slave.
Monitor networking as example taking NVR and IPC, send after amendment message when IPC receives NVR, can take out MAC Address and self IP address of in message, carrying and compare.If MAC Address is inconsistent, abandon this message, no longer carry out follow-up processing; If MAC Address is consistent, revise self IP address, default gateway, subnet mask.
In addition, prior art is normally revised the IP address of IPC by hand, then adds in the control list of NVR, but so having relatively high expectations to workmen just.And technical scheme provided by the present invention, can send amendment message by main control device, slave is revised IP address according to this amendment message, and the IP address that main control device can add slave is automatically to controlling in list, substantially without manual operation, and then a large amount of manpowers have been saved.
Step 5, slave is restarted after amendment IP address, default gateway and subnet mask.
In order to preserve setting and the amendment to slave, and start related service, slave, after amendment IP address, default gateway and subnet mask, can be restarted.And after restarting, IP address, default gateway and the subnet mask of slave is exactly amended IP address, default gateway and subnet mask.That is to say, after restarting, the IP address of slave and main control device are at the same network segment.From step 1; main control device can periodically send multicast probe messages conventionally; so slave is after restarting; can again receive probe messages; then the operation of repeating step 2, step 3; because the IP address of the slave after restarting and the IP address of main control device are in the same network segment, so just can adding the IP address of this slave to, main control device controls in list.Same, the slave after restarting also only sends one time multicast response message conventionally, and for the follow-up probe messages receiving, slave is generally no longer replied.
Here also it should be noted that, in actual applications, likely there will be slave withdraw from service situation, taking NVR and IPC as example, slave withdraw from service situation is described below.Suppose that certain IPC as slave has been used as the NVR discovery of main control device, and its IP address is added to and controlled in list.If this IPC breaks down; cannot use; so generally; because IPC can periodically send keep-alive message to NVR, in the time that IPC causes quitting work due to fault, NVR just cannot receive the keep-alive message that IPC sends; the NVR prompting of conventionally can being correlated with so; maintenance personal can be according to prompting, finds the IPC breaking down, and it is keeped in repair to nursing.If because the region monitored of this IPC no longer needs monitoring, people is the work that stops this IPC, can, in the control list of NVR, the IP address of this IPC be deleted so, thereby has saved the memory space of NVR.
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 (10)
1. a system of automatically finding and adding equipment, this system comprises main control device and slave, it is characterized in that, described main control device and described slave are in same multicast group, wherein:
Described main control device, be used for sending multicast probe messages, and respond after the response message of described probe messages at reception slave, judge that according to this response message the IP address of described slave and the IP address of main control device are whether at the same network segment, if, the IP address of described slave is added in default control list, if not, send multicast amendment message; Wherein, described amendment message comprises MAC Address and the new IP address of slave, and the IP address of new IP address and described main control device is in the same network segment;
Described slave, the probe messages sending for receiving main control device, and send it back should probe messages multicast response message, and receive main control device send amendment message, in the time that the MAC Address in described amendment message is self MAC address, according to this amendment message, new IP address is revised as in self former IP address.
2. system according to claim 1, is characterized in that, described main control device periodically sends multicast probe messages.
3. system according to claim 1, is characterized in that, described main control device is network video machine NVR, and described slave is web camera IPC.
4. system according to claim 1, is characterized in that, described slave also for, in the time that the MAC Address in described amendment message is not self MAC address, abandon this amendment message.
5. system according to claim 1, is characterized in that, described slave also for restarting behind amendment IP address.
6. a method of automatically finding and adding equipment, is characterized in that, described method comprises:
Steps A, main control device sends multicast probe messages;
Step B, slave receives probe messages, and send it back should probe messages multicast response message;
Step C, main control device, receiving after response message, judges that according to this response message whether the IP address of described slave and the IP address of main control device are at the same network segment, if, the IP address of described slave is added in default control list, if not, send multicast amendment message; Wherein, described amendment message comprises MAC Address and the new IP address of slave, and the IP address of new IP address and described main control device is in the same network segment;
Step D, slave receives amendment message, in the time that the MAC Address in described amendment message is self MAC address, according to this amendment message, new IP address is revised as in former IP address.
7. method according to claim 6, is characterized in that, described steps A further comprises and periodically sends multicast probe messages.
8. system according to claim 6, is characterized in that, described main control device is network video machine NVR, and described slave is web camera IPC.
9. system according to claim 6, is characterized in that, described step D also comprises, in the time that the MAC Address in described amendment message is not self MAC address, abandons this amendment message.
10. system according to claim 6, is characterized in that, described method also comprises:
Step e, slave is restarted behind amendment IP address.
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