CN104539752B - Access method and system between multilevel field platform - Google Patents
Access method and system between multilevel field platform Download PDFInfo
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- CN104539752B CN104539752B CN201410854785.9A CN201410854785A CN104539752B CN 104539752 B CN104539752 B CN 104539752B CN 201410854785 A CN201410854785 A CN 201410854785A CN 104539752 B CN104539752 B CN 104539752B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/10—Mapping addresses of different types
- H04L61/103—Mapping addresses of different types across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/25—Mapping addresses of the same type
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Abstract
The present invention provides the access method and system between multilevel field platform, and this method is applied on the platform of higher level domain, including：The access request that user terminal is sent is received, inquiry subordinate domain identifier, access request is sent to subordinate domain platform corresponding to subordinate's domain identifier, the subordinate domain mapping item that subordinate domain platform is sent is received, establishes higher level's domain mapping list item；Message is established in reception, establishes higher level domain the first network segment address transformation table entries；The access message that user terminal is sent first is received, establishes higher level domain the second network segment address transformation table entries, and is changed according to higher level domain the second network segment address transformation table entries, and the access message after conversion is sent to subordinate domain platform.Using the embodiment of the present invention, the access between multilevel field platform is completed by device identification and the combination of subordinate's domain identifier, higher level domain platform can be allowed to realize multiplexed port, so as to add access profile, and improve access efficiency.
Description
Technical field
The present invention relates to the access method between network communication technology field, more particularly to multilevel field platform and system.
Background technology
With the development of the network communications technology, whole security protection industry comes into the network monitoring epoch, and is required to
Real time access is carried out to the monitoring image of headend equipment across wide area network.Wherein, wide area network is a kind of trans-regional data communication network
Network, the equipment provided using telecom operators are used as information transmission platform.
In the prior art, when the headend equipment hung under the user terminal and subordinate domain platform on the platform of higher level domain passes through wide area
When net is communicated, the two is isolation on physical network so that it is enterprising that user terminal can not be directly logged onto headend equipment
Row accesses.The access method typically used is：Higher level domain platform can do access for the headend equipment hung under subordinate domain platform and reflect
Penetrate, and sent the access message of user terminal to headend equipment according to the access map, and can the headend equipment matched somebody with somebody
Put and safeguard.Wherein, higher level domain platform needs each headend equipment for subordinate domain platform to choose a different port numbers work
Access map.
But when higher level domain platform is connected with multiple subordinate domain platforms, each subordinate domain platform is again lower to hang multiple front ends
During equipment, the situation of port numbers shortage will occurs in higher level domain platform, limits the access profile of higher level domain platform, and reduce
Its access efficiency.
The content of the invention
The present invention provide multilevel field platform between access method and system, with solve in the prior art when higher level domain platform with
Multiple subordinate domain platforms are connected, and each subordinate domain platform hangs down multiple headend equipments again when, end will occurs in higher level domain platform
The situation of slogan shortage, the problem of limiting the access profile of higher level domain platform, and reduce its access efficiency.
First aspect according to embodiments of the present invention, there is provided the access method between a kind of multilevel field platform, methods described should
For higher level domain platform, higher level domain platform is connected with least one user terminal, and passes through wide area network and at least one
One end of individual subordinate domain platform is connected, and the subordinate domain platform other end is connected with least one headend equipment, the side
Method includes：
The access request that user terminal is sent is received, the access request carries the equipment mark of headend equipment to be visited
Know；
Put down according to the subordinate domain being connected with the headend equipment to be visited that device identification inquiry locally preserves
Subordinate's domain identifier of platform, and the access request is sent to subordinate domain platform corresponding to subordinate's domain identifier, so that described
Subordinate domain platform is that the headend equipment to be visited establishes subordinate domain mapping item according to the access request；
The subordinate domain mapping item that the subordinate domain platform is sent is received, is institute according to the subordinate domain mapping item
State headend equipment to be visited and establish higher level's domain mapping list item, and by subordinate's domain identifier in higher level's domain mapping list item, on
Level domain mapping address and higher level's domain mapping port numbers are sent to user terminal；Wherein, when to belong to the two of different subordinate domain platforms
It is each to be visited in the higher level's domain mapping list item established when headend equipment to be visited establishes higher level's domain mapping list item more than individual
Headend equipment corresponding to higher level's domain mapping port numbers it is identical；
Receive the user terminal transmission establishes message, and according to the content for establishing message and address, Yi Jisuo
State the network segment of higher level domain first corresponding to subordinate domain mapping address and the foundation of subordinate domain mapped port number in subordinate domain mapping item
Address conversion list item；
The access message that the user terminal is sent first is received, the access message carries the device identification and institute
State subordinate's domain identifier；
Destination address and destination interface according to higher level domain the first network segment address transformation table entries to the access message
Number changed, establish higher level domain the second network segment address transformation table entries, and according to the second network segment address of higher level domain conversion table
Item is changed to the source address and source port number of the access message, and the access message after the conversion is sent to institute
Subordinate domain platform corresponding to subordinate's domain identifier is stated, so that the subordinate domain platform is according to subordinate domain the second network segment address transformation table entries
The address of the access message is changed again with the network segment address transformation table entries of subordinate domain the 3rd, and by after the conversion
Message is accessed to send to headend equipment to be visited.
Second aspect according to embodiments of the present invention, there is provided the access system between a kind of multilevel field platform, the system bag
Include higher level domain platform and at least one subordinate domain platform；
Higher level domain platform is connected with least one user terminal, and is put down by wide area network and at least one subordinate domain
One end of platform is connected, and the subordinate domain platform other end is connected with least one headend equipment；
Wherein, higher level domain platform is used for the access request for receiving user terminal transmission, and the access request, which carries, to be needed to be visited
The device identification for the headend equipment asked；It is locally preserving with the headend equipment phase to be visited according to device identification inquiry
Subordinate's domain identifier of the subordinate domain platform of connection, and the access request is sent to subordinate domain corresponding to subordinate's domain identifier
Platform, so that the subordinate domain platform is that the headend equipment to be visited establishes subordinate domain mapping table according to the access request
；The subordinate domain mapping item that the subordinate domain platform is sent is received, according to the subordinate domain mapping item and described
In subordinate domain mapping item corresponding headend equipment to be visited whether belong to different subordinate domain platforms for it is described it is to be visited before
End equipment establishes higher level's domain mapping list item, and by subordinate's domain identifier in higher level's domain mapping list item, higher level's domain mapping address
Sent with higher level's domain mapping port numbers to user terminal；Wherein, when to be visited to belong to the two or more of different subordinate domain platforms
Headend equipment when establishing higher level's domain mapping list item, each headend equipment pair to be visited in the higher level's domain mapping list item established
The higher level's domain mapping port numbers answered are identical；Receive the message of establishing that the user terminal sends, and according to the message of establishing
Content and address and subordinate domain mapping address and subordinate domain mapped port number foundation correspondence in the subordinate domain mapping item
Higher level domain the first network segment address transformation table entries；Receive the access message that the user terminal is sent first, the access message
Carry the device identification and subordinate's domain identifier；According to higher level domain the first network segment address transformation table entries to the visit
The destination address and destination slogan for asking message are changed, and establish higher level domain the second network segment address transformation table entries, and according to institute
Higher level domain the second network segment address transformation table entries are stated to change the source address and source port number of the access message, and by institute
State conversion after access message send to subordinate domain platform corresponding to subordinate's domain identifier so that the subordinate domain platform according to
Subordinate domain the second network segment address transformation table entries and the network segment address transformation table entries of subordinate domain the 3rd to the address of the access message again
It is secondary to be changed, and the access message after the conversion is sent to headend equipment to be visited；
The subordinate domain platform is used for the access request for receiving the user terminal that higher level domain platform is sent, the access
The device identification of headend equipment to be visited is carried in request；It is the headend equipment to be visited according to the access request
Subordinate domain mapping item is established, and the subordinate domain mapping item is sent to higher level domain platform, so that the higher level domain
Platform is that the headend equipment to be visited establishes higher level's domain mapping list item according to the subordinate domain mapping item；Receive on described
The access message for the user terminal that level domain platform is sent first, the access message is according to higher level by higher level domain platform
Message after domain the first network segment address transformation table entries and the conversion of higher level domain the second network segment address transformation table entries；And according to described
Access message destination address and destination slogan and inquire about the subordinate domain mapping item, and according to it is described inquire it is to be visited
The reference address and access end slogan of headend equipment establish subordinate domain the second network segment address transformation table entries；According to the subordinate domain
Two network segment address transformation table entries are changed to the destination address and destination slogan of the access message, establish subordinate domain the 3rd
Network segment address transformation table entries, and according to the network segment address transformation table entries of subordinate domain the 3rd to it is described access message source address and
Source port number is changed, and the access message after the conversion is sent to headend equipment to be visited.
Using the embodiment of the present invention, when higher level domain platform is connected with multiple subordinate domain platforms, each subordinate domain platform is again
During the multiple headend equipments of lower extension, the access between multilevel field platform can be completed by device identification and the combination of subordinate's domain identifier,
And higher level domain platform can be allowed to realize multiplexed port, so as to solve the problems, such as the platform port numbers shortage of higher level domain, and add
The access profile of higher level domain platform, also improves the access efficiency between multilevel field platform.
Brief description of the drawings
Fig. 1 is to apply the access application scenarios schematic diagram between multilevel field platform of the embodiment of the present invention；
Fig. 2 is one embodiment flow chart of the access method between multilevel field platform of the present invention；
Fig. 3 is the schematic diagram that message is established in the access method between multilevel field platform of the present invention；
Fig. 4 is another embodiment flow chart of the access method between multilevel field platform of the present invention；
Fig. 5 is a kind of hardware structure diagram of the access mechanism place equipment between multilevel field platform of the present invention.
Embodiment
In order that those skilled in the art more fully understand the technical scheme in the embodiment of the present invention, and make of the invention real
Apply the above-mentioned purpose of example, feature and advantage can be more obvious understandable, below in conjunction with the accompanying drawings to technical side in the embodiment of the present invention
Case is described in further detail.
Referring to Fig. 1, for the access application scenarios schematic diagram between application multilevel field platform of the embodiment of the present invention：
A kind of group-network construction of the access system between multilevel field platform is shown in Fig. 1.Higher level domain in the access system
Platform is connected with least one user terminal, and is connected by wide area network with one end of at least one subordinate domain platform, institute
The subordinate domain platform other end is stated with least one headend equipment to be connected.As illustrated, higher level domain platform respectively with user terminal
1st, user terminal 2 is connected, and is connected respectively with subordinate domain platform 1, subordinate domain platform 2 by wide area network, subordinate domain platform 1
It is connected with headend equipment 1, subordinate domain platform 2 is connected with headend equipment 2, headend equipment 3 respectively.
Wherein, user terminal can include various smart mobile phones, tablet personal computer, PC (Personal Computer, individual
Computer) etc..Headend equipment can be web camera (IP Camera, IPC), and the web camera is by traditional cameras
With network technology with reference to caused by video camera of new generation.
Because higher level domain platform one end can connect multiple user terminals, the other end can be connected by wide area network it is multiple under
Level domain platform, each subordinate domain platform can connect multiple headend equipments again, it may appear that higher level domain platform port numbers are not enough
Phenomenon, the requirements for access for now needing higher level domain platform that subordinate's domain identifier can be utilized to realize port numbers multiplexing.
For example because headend equipment 1 is connected with subordinate domain platform 1, headend equipment 2 is connected with subordinate domain platform 2, makes
Must be from different, the higher level domain of both subordinate's domain identifier corresponding to headend equipment 1 and subordinate corresponding with headend equipment 2 domain identifier
Platform can be then that headend equipment 1 and headend equipment 2 distribute identical higher level's domain mapping address, higher level's domain mapping port numbers, than
Such as：Higher level's domain mapping address is 172.1.1.1, and higher level's domain mapping port numbers are 20000.
Specially：When user terminal 1 needs to access headend equipment 1, the superior domain platform of user terminal 1, which initiates to access, asks
Ask, the device identification of the headend equipment 1 is carried in the access request；Higher level domain platform is according to the equipment mark of the headend equipment 1
Know and inquire about higher level's domain mapping address corresponding to the device identification, higher level's domain mapping port numbers in higher level's domain mapping list item of local
And the subordinate's domain identifier for the subordinate domain platform being connected with headend equipment 1 is sent to user terminal 1, such as：Higher level's domain mapping
Address is 172.1.1.1, and higher level's domain mapping port numbers are 20000；User terminal 1 can choose the untapped port in a local
Number, such as：30000, it is source port number, using the IP address of itself as source address, using 172.1.1.1 as purpose address, with
20000 be that purpose port numbers superior domain platform sends and establishes message, and it is a specific message that this, which establishes message, its message content
For subordinate's domain identifier of subordinate domain platform 1, the purpose is to higher level domain the first network segment address conversion table for establishing headend equipment 1
；Higher level domain platform according to the content and address for establishing message, the higher level's domain mapping list item being locally created and can receive
Subordinate domain platform subordinate domain mapping item, so as to establish higher level domain the first network segment address conversion table for headend equipment 1
.
Similarly, when user terminal 2 needs to access headend equipment 2, the superior domain platform of user terminal 2, which initiates to access, asks
Ask, the device identification of the headend equipment 2 is carried in the access request；Higher level domain platform is according to the equipment mark of the headend equipment 2
Know and inquire about higher level's domain mapping address corresponding to the device identification, higher level's domain mapping port numbers in higher level's domain mapping list item of local
And the subordinate's domain identifier for the subordinate domain platform being connected with headend equipment 2 is sent to user terminal 1.Now user terminal 2 can
To choose the untapped port numbers in local, such as：30001, it is source port number, using the IP address of itself as source address,
It is that message is established in platform transmission in purpose port numbers superior domain with 20000, this establishes message using 172.1.1.1 as purpose address
It is a specific message, its message content is subordinate's domain identifier of subordinate domain platform 2, and the purpose is to for establishing headend equipment 2
Higher level's domain addresses transformation table entries；Higher level domain platform can be according to the content and address for establishing message, the higher level domain being locally created
The subordinate domain mapping item of mapping item and the subordinate domain platform received, so as to establish the higher level domain for headend equipment 2
Address conversion list item.
Therefore, even if user terminal 1 accesses headend equipment 1 and the access headend equipment 2 of user terminal 2, it accesses message
Destination address it is identical with destination slogan, but because source address and source port number are different, can also be given to different subordinate domains
It platform, can thus allow higher level domain platform to realize multiplexed port, solve the problems, such as that higher level domain platform port numbers are not enough.
In addition, in the embodiment of the present invention, described by taking higher level domain platform and subordinate domain platform as an example, but to both platforms
Grade be not restricted, i.e., both platforms can also be the platform of ad eundem, and suitable for all embodiments of the invention.And
And in all embodiments of the invention, first network segment refers to the network segment used between user terminal and higher level domain platform, the second net
Section refers to the network segment used between higher level domain platform and subordinate domain platform, and the 3rd network segment refers to that subordinate domain platform and front end are set
The network segment used between standby.
The embodiment of the cross-domain access of the present invention is described in detail below in conjunction with the accompanying drawings.
Referring to Fig. 2, one embodiment flow chart of the access method between multilevel field platform of the present invention, the embodiment is from upper
Level domain platform is described, and the higher level domain platform is connected with least one user terminal, and by wide area network with it is at least one
One end of subordinate domain platform is connected, and the subordinate domain platform other end is connected with least one headend equipment, and methods described includes
Following steps：
Step 210：The access request that user terminal is sent is received, the access request carries headend equipment to be visited
Device identification.The device identification can be used for identifying corresponding headend equipment.Such as：Device coding, title, IP address etc..
Step 220：Put down according to the subordinate domain being connected with headend equipment to be visited that device identification inquiry locally preserves
Subordinate's domain identifier of platform, and access request is sent to subordinate domain platform corresponding to subordinate's domain identifier, so that subordinate domain platform root
It is that headend equipment to be visited establishes subordinate domain mapping item according to access request.
In the present embodiment, because higher level domain platform can connect multiple subordinate domain platforms, each subordinate domain platform again can be with
Multiple headend equipments are connected, now need to use the combination of device identification and subordinate's domain identifier to be set to characterize each different front end
It is standby, higher level domain platform could be enabled to send the access request of user terminal to corresponding subordinate domain platform.
Wherein, higher level domain platform can be sent the access request to corresponding by national standard (GB28181) message format
Subordinate domain platform, and corresponding subordinate domain platform can be by national standard (GB28181) message formats by subordinate domain mapping item
Send to higher level domain platform.
For example user terminal 1 needs to access the headend equipment 1 and headend equipment 2 of 1 time extension of subordinate domain platform, subordinate domain is put down
Platform 1 is that headend equipment 1 and headend equipment 2 map, and for subordinate domain platform 1, headend equipment 1 and headend equipment 2 access subordinate
The IP address of domain platform 1 is 192.168.1.1, then subordinate domain platform 1 is done using the IP address (1.1.1.1) of second network segment for it
Access map.In addition, the access end slogan of headend equipment 1 and headend equipment 2 is 80, then the subordinate domain that subordinate domain platform 1 is established
Mapping item is as shown in table 1.Wherein, the reference address of headend equipment 1 is 192.168.1.100, the access port of headend equipment 1
Number be 80, subordinate domain platform 1 be headend equipment 1 distribution subordinate domain mapping address be 1.1.1.1, subordinate domain platform 1 is front end
The subordinate domain mapped port number that equipment 1 is distributed is 10000.Similarly, the reference address of headend equipment 2 is 192.168.1.101, preceding
The access end slogan of end equipment 2 is 80, and subordinate domain platform 1 is that the subordinate domain mapping address that headend equipment 2 distributes is 1.1.1.1,
Subordinate domain platform 1 is that the subordinate domain mapped port number that headend equipment 2 distributes is 10001.
Table 1
The device identification of above-mentioned subordinate domain mapping item and headend equipment is bound, when the IP address of headend equipment 2 is sent out
During raw change, subordinate domain platform 1 is the subordinate domain mapping address and subordinate domain mapped port number after the mapping that headend equipment 2 distributes
Can be with constant, even if the IP address for realizing headend equipment changes, higher level domain platform and user terminal are also without perception
Know, and the subordinate domain mapping item established is also without and then change.As shown in table 2, when headend equipment 2 IP address by
192.168.1.101 after being changed to 192.168.1.105, subordinate domain platform 1 is that the subordinate domain after the mapping that headend equipment 2 distributes is reflected
Penetrate address and subordinate domain mapped port number can be with constant, subordinate domain platform avoids the need for the subordinate domain mapping item that will be changed
Higher level domain platform is pushed to again, reduces the concussion of the access system between multilevel field platform.
Table 2
Again for example, user terminal 2 needs to access the headend equipment 3 of 2 times extensions of subordinate domain platform.Subordinate domain platform 2 is front end
Equipment 3 maps, and for subordinate domain platform 2, the IP address that headend equipment 3 accesses subordinate domain platform 2 is 192.168.1.2, then
Subordinate domain platform 2 does access map using the IP address (1.1.1.2) of second network segment for it.In addition, the access end of headend equipment 3
Slogan is 80.The subordinate domain mapping item that then subordinate domain platform 2 is established is as shown in table 3.Wherein, the reference address of headend equipment 3
For 192.168.1.102, the access end slogan of headend equipment 3 is 80, and subordinate domain platform 2 is that the subordinate domain that headend equipment 3 distributes is reflected
It is 1.1.1.2 to penetrate address, and subordinate domain platform 2 is that the subordinate domain mapped port number that headend equipment 3 distributes is 10000.
Table 3
Step 230：Receive the subordinate domain mapping item that subordinate domain platform is sent, according to subordinate domain mapping item and under
It is headend equipment to be visited that whether corresponding headend equipment to be visited, which belongs to different subordinate domain platforms, in level domain mapping list item
Higher level's domain mapping list item is established, and subordinate's domain identifier in higher level's domain mapping list item, higher level's domain mapping address and higher level domain are reflected
Port numbers are penetrated to send to user terminal.Wherein, when to belong to the two or more of different subordinate domain platforms headend equipment to be visited
When establishing higher level's domain mapping list item, higher level domain corresponding to each headend equipment to be visited in the higher level's domain mapping list item established
Mapped port number is identical.
Alternatively, in the above-described embodiments, according to corresponding in subordinate domain mapping item and the subordinate domain mapping item
Headend equipment to be visited whether belong to different subordinate domain platforms and also include：When to belong to the two of a subordinate domain platform
It is each to be visited in the higher level's domain mapping list item established when headend equipment to be visited establishes higher level's domain mapping list item above
Higher level's domain mapping port numbers all differ corresponding to headend equipment.
For example user terminal 1 needs to access the headend equipment 1 and headend equipment 2 of 1 time extension of subordinate domain platform, for higher level
Domain platform, the access IP address of subordinate domain platform 1 is the IP address (10.10.10.1) of second network segment, then using the 3rd network segment
IP address (172.1.1.1) makees access map for it, while the subordinate domain of subordinate domain platform is indicated in higher level's domain mapping list item
Mark, its higher level's domain mapping list item are as shown in table 4.Wherein, higher level's domain mapping port numbers that headend equipment 1 distributes are 20000, preceding
Higher level's domain mapping port numbers that end equipment 2 is distributed are 20001.
Table 4
When higher level domain platform is connected with multiple subordinate domain platforms, and the headend equipment hung under each subordinate domain platform compared with
When more, it may appear that the problem of higher level domain port numbers are not enough, then need to use subordinate's domain identifier to realize that higher level domain port numbers are answered
Requirements for access.
For example user terminal 1 needs to access the headend equipment 1 of 1 time extension of subordinate domain platform, before 2 times extensions of subordinate domain platform
During end equipment 3, higher level domain platform can use identical IP address (172.1.1.1) different for two with port numbers (20000)
The headend equipment of subordinate domain platform map, as shown in table 5.
Table 5
Higher level's domain mapping list item shown in above-mentioned table 4 and table 5 can obtain, for each front end of identical subordinate domain platform
Higher level's domain mapping port numbers of equipment can not be identical；For higher level's domain mapping end of each headend equipment of different subordinate domain platforms
Slogan can be with identical.
Step 240：Receive that user terminal sends establishes message, and according to the content and address for establishing message and under
The network segment address of higher level domain first corresponding to subordinate domain mapping address and the foundation of subordinate domain mapped port number in level domain mapping list item
Transformation table entries.Wherein, the content for establishing message is subordinate's domain identifier, and establishing the address of message includes：Destination address, purpose
Port numbers, source address and source port number；The destination address is higher level's domain mapping address, and the destination slogan is described
Higher level's domain mapping port numbers, the source address are user terminal address, and the source port number is user terminal port numbers.
For example user terminal 1, when needing to access the headend equipment 1 that subordinate domain platform is hung for 1 time, higher level domain platform is according to higher level
Domain mapping list item, by higher level's domain mapping address (172.1.1.1), higher level's domain mapping port numbers (20000) and subordinate domain platform 1
Subordinate's domain identifier returns to user terminal 1.User terminal 1 firstly the need of choose the untapped port numbers in local, such as,
30000, it is source port number, using the IP address of itself as source address, superior domain mapping address (172.1.1.1) is purpose address
It is that message is established in source port number transmission with higher level's domain mapping port numbers (20000).It is a special message that this, which establishes message, is had
Fixed message format, as shown in Figure 3.
In addition, the higher level domain first network segment address transformation table entries of establishing message foundation of the higher level domain platform according to Fig. 3
As shown in table 6.
Table 6
Above-mentioned source address (172.1.1.100) and source port number (30000) are addresses corresponding to user terminal 1, destination
Location (172.1.1.1) and destination slogan (20000) are the incoming interfaces for accessing message and being directed to higher level domain platform of user terminal 1,
Destination address (1.1.1.1) and destination slogan (10000) are access message the entering for subordinate domain platform 1 of user terminal 1
Interface.
Again for example, when user terminal 2 needs to access the headend equipment 3 of 2 times extensions of subordinate domain platform, the higher level domain first of foundation
Network segment address transformation table entries can be as shown in table 7.
Table 7
Above-mentioned source address (172.1.1.101) and source port number (30000) are addresses corresponding to user terminal 2, destination
Location (172.1.1.1) and destination slogan (20000) are the incoming interfaces for accessing message and being directed to higher level domain platform of user terminal 2,
Destination address (1.1.1.2) and destination slogan (10000) are access message the entering for subordinate domain platform 2 of user terminal 2
Interface.
In addition, even if user terminal 1 access headend equipment 1, or user terminal 2 access headend equipment 3 when, superior domain
The destination address and destination slogan of platform transmission message are all identical, but the source address and source port number due to user terminal
Difference, it can will also access message and be sent to different subordinate domain platforms, it is achieved thereby that the multiplexed port of higher level domain platform.
Step 250：The access message that user terminal is sent first is received, the access message carries device identification with
Level domain identifier.
In the present embodiment, higher level domain platform can connect multiple subordinate domain platforms, and each subordinate domain platform can connect again
Multiple headend equipments, in order to distinguish different subordinate domain platforms, under each subordinate domain platform all has corresponding subordinate's domain identifier i.e.
Level domain identity number (Identity, ID), each headend equipment all have corresponding device identification i.e. device id.When user is whole
When end accesses headend equipment to be visited, the device identification of the headend equipment to be visited is not only needed, it is also necessary to which this is to be visited
Headend equipment belonging to subordinate domain platform corresponding to subordinate's domain identifier, such user terminal can just have access to this it is to be visited before
End equipment.
Step 260：Destination address and destination interface according to higher level domain the first network segment address transformation table entries to access message
Number changed, and establish higher level domain the second network segment address transformation table entries, and according to higher level domain the second network segment address transformation table entries
The source address and source port number for accessing message are changed, and the access message after conversion is sent to subordinate's domain identifier pair
The subordinate domain platform answered, so that subordinate domain platform is according to subordinate domain the second network segment address transformation table entries and the network segment of subordinate domain the 3rd
Location transformation table entries are changed again to the address for accessing message, and the access message after conversion is sent to front end to be visited
Equipment.
For example user terminal 1 is when needing to access the headend equipment 1 of 1 time extension of subordinate domain platform, the foundation of higher level domain platform it is upper
Level domain the first network segment address transformation table entries are as shown in table 6.In addition, higher level domain platform needs to visit from outgoing interface (10.10.10.1)
Ask that message is sent to subordinate domain platform 1, therefore need using 10.10.10.1 as the source address for accessing message, meanwhile, choose one
Local port number, such as, 30001, as the source port number for accessing message, higher level domain the second network segment address conversion table is established with this
, as shown in table 8.
Table 8
Above-mentioned source address (172.1.1.100) and source port number (30000) are addresses corresponding to user terminal 1, destination
Location (1.1.1.1) and destination slogan (10000) are that the access message of user terminal 1 is directed to the incoming interface of subordinate domain platform 1, source
Address (10.10.10.1) and source port number (30001) are that the access message of user terminal 1 is sent into going out to subordinate domain platform 1
Interface.Moreover, in source port number (30001) selection course, identical port can be selected for different subordinate's domain identifiers
Number, then need to select different port numbers for identical subordinate domain identifier.
Alternatively, in the above-described embodiments, the access method between multilevel field platform of the present invention also includes：
(1) the access message that SS later is sent is received.
(2) destination address and destination slogan that access message are carried out according to higher level domain the first network segment address transformation table entries
Conversion, and the source address and source port number that access message are changed according to higher level domain the second network segment address transformation table entries, with
And send the access message after conversion to subordinate domain platform corresponding to subordinate's domain identifier, so that subordinate domain platform is to the access
The address of message is changed again, and the access message after conversion is sent to headend equipment to be visited.
Still optionally further, in the above-described embodiments, the access method between multilevel field platform of the present invention also includes：
(1) the reply message for the headend equipment to be visited that subordinate domain platform corresponding to subordinate's domain identifier is sent is received.
(2) destination address and destination slogan of replying message are carried out according to higher level domain the first network segment address transformation table entries
Conversion, and the source address and source port number of replying message are changed according to higher level domain the second network segment address transformation table entries, with
And the reply message after conversion is sent to user terminal.
As seen from the above-described embodiment, when higher level domain platform is connected with multiple subordinate domain platforms, each subordinate domain platform is again
During the multiple headend equipments of lower extension, the access between multilevel field platform can be completed by device identification and the combination of subordinate's domain identifier,
And higher level domain platform can be allowed to realize multiplexed port, so as to solve the problems, such as the platform port numbers shortage of higher level domain, and add
The access profile of higher level domain platform, also improves the access efficiency between multilevel field platform.
Referring to Fig. 4, another embodiment flow chart of the access method between multilevel field platform of the present invention, the embodiment should
For subordinate domain platform, the subordinate domain platform is connected with least one headend equipment, and passes through wide area network and higher level domain
One end of platform is connected, and the other end of higher level domain platform is connected with least one user terminal, and methods described includes
Following steps：
Step 410：The access request for the user terminal that higher level domain platform is sent is received, is carried in access request to be visited
Headend equipment device identification.
In the present embodiment, each headend equipment can be characterized using device identification and the combination of subordinate's domain identifier, that is, be used
Family terminal can access the headend equipment using device identification and the combination of subordinate's domain identifier.
Step 420：It is that headend equipment to be visited establishes subordinate domain mapping item according to access request, and subordinate domain is reflected
Firing table item is sent to higher level domain platform, so that higher level domain platform is established according to subordinate domain mapping item for headend equipment to be visited
Higher level's domain mapping list item.
In above-mentioned steps 410 and step 420, higher level domain platform can be visited this by national standard (GB28181) message format
National standard (GB28181) message lattice can be passed through by asking that request is sent to corresponding subordinate domain platform, and corresponding subordinate domain platform
Formula sends subordinate domain mapping item to higher level domain platform.
For example user terminal 1 needs to access the headend equipment 1 and headend equipment 2 of 1 time extension of subordinate domain platform, subordinate domain is put down
The subordinate domain mapping item that platform 1 is established is as shown in table 1.
It is alternatively, described that subordinate domain mapping item is established for the headend equipment to be visited according to the access request,
Also include：
The device identification of the subordinate domain mapping item and headend equipment to be visited is bound so that the equipment
Mark turns into the unique mark of the subordinate domain mapping item, and the subordinate domain mapping address in the subordinate domain mapping item
It will not change with subordinate domain mapped port number with the change of the headend equipment reference address in the subordinate domain mapping item.
Such as shown in Tables 1 and 2.
Step 430：The access message for the user terminal that higher level domain platform is sent first is received, it is by higher level to access message
Domain platform is according to the message after higher level domain the first network segment address transformation table entries and the conversion of higher level domain the second network segment address transformation table entries.
Such as higher level domain the first network segment address transformation table entries shown in table 6 and the network segment address conversion of higher level domain second shown in table 8
List item.
Step 440：According to access message destination address and destination slogan inquiry subordinate domain mapping item, and according to inquiry
To headend equipment to be visited reference address and access end slogan establish subordinate domain the second network segment address transformation table entries.
For example user terminal 1 is when needing to access the headend equipment 1 of 1 time extension of subordinate domain platform, the foundation of subordinate domain platform 1
Subordinate domain the second network segment address transformation table entries are as shown in table 9.
Table 9
Above-mentioned purpose address (1.1.1.1) and destination slogan (10000) are that the access message of user terminal 1 is directed to subordinate
The incoming interface of domain platform, destination address (192.168.1.100) and destination slogan (80) be headend equipment 1 reference address and
Access end slogan.
Step 450：Destination address and destination interface according to subordinate domain the second network segment address transformation table entries to access message
Number changed, establish the network segment address transformation table entries of subordinate domain the 3rd, and according to the network segment address transformation table entries pair of subordinate domain the 3rd
The source address and source port number for accessing message are changed, and the access message after conversion is sent to front end to be visited and set
It is standby.
For example user terminal 1 is when needing to access the headend equipment 1 of 1 time extension of subordinate domain platform, the foundation of subordinate domain platform 1
The network segment address transformation table entries of subordinate domain the 3rd are as shown in table 10.
Table 10
Above-mentioned source address (192.168.1.1) and source port number (30002) be by the access message of user terminal 1 send to
The outgoing interface of headend equipment 1, destination address (192.168.1.100) and destination slogan (80) are the access of headend equipment 1
Location and access end slogan.
Alternatively, in above-described embodiment, the access method between multilevel field platform of the present invention also includes：
(1) the access message for the user terminal that higher level domain platform is subsequently sent is received；
(2) destination address and destination slogan that access message are carried out according to subordinate domain the second network segment address transformation table entries
Conversion, and the source address and source port number that access message are changed according to the network segment address transformation table entries of subordinate domain the 3rd, with
And the access message after conversion is sent to headend equipment to be visited.
Still optionally further, in above-described embodiment, the access method between multilevel field platform of the present invention also includes：
Receive the reply message that headend equipment to be visited is sent；
The destination address and destination slogan of replying message are turned according to subordinate domain the second network segment address transformation table entries
Change, and the source address and source port number of replying message are changed according to the network segment address transformation table entries of subordinate domain the 3rd, and
Reply message after conversion is sent to higher level domain platform, so that higher level domain platform is according to higher level domain the first network segment address conversion table
And higher level domain the second network segment address transformation table entries the address for replying message is changed again, and by the reply report after conversion
Text is sent to user terminal.
As seen from the above-described embodiment, when multiple subordinate domain platforms are connected with higher level domain platform, each subordinate domain platform is again
During the multiple headend equipments of lower extension, the access between multilevel field platform can be completed by device identification and the combination of subordinate's domain identifier,
The function of agent side slogan multiplexing is realized, adds the access profile of higher level domain platform, and is improved between multilevel field platform
Access efficiency.
Access method embodiment between foregoing multilevel field platform is corresponding, and present invention also offers between multilevel field platform
The embodiment of access mechanism.
The embodiment of access mechanism between multilevel field platform of the present invention can be applied on the platform of higher level domain.Device embodiment
It can be realized, can also be realized by way of hardware or software and hardware combining by software.Exemplified by implemented in software, as one
Device on individual logical meaning, it is by corresponding computer program in nonvolatile memory by the processor of equipment where it
Instruction reads what operation in internal memory was formed.For hardware view, as shown in figure 5, the visit between multilevel field platform of the present invention
A kind of hardware structure diagram of equipment where device is asked, except the processor shown in Fig. 5, network interface, internal memory and non-volatile
Outside memory, the equipment in embodiment where device can also generally include other hardware, such as be responsible for the forwarding of processing message
Chip etc.；The equipment is also possible to be distributed equipment from hardware configuration, may include multiple interface cards, so as to
Hardware view carries out the extension of Message processing.
The function of unit and the implementation process of effect specifically refer to and step are corresponded in the above method in said apparatus
Implementation process, it will not be repeated here.
For device embodiment, because it corresponds essentially to embodiment of the method, so related part is real referring to method
Apply the part explanation of example.Device embodiment described above is only schematical, wherein described be used as separating component
The unit of explanation can be or may not be physically separate, can be as the part that unit is shown or can also
It is not physical location, you can with positioned at a place, or can also be distributed on multiple NEs.Can be according to reality
Need to select some or all of module therein to realize the purpose of the present invention program.Those of ordinary skill in the art are not paying
In the case of going out creative work, you can to understand and implement.
The embodiment of the present invention additionally provides the access system between a kind of multilevel field platform, and the system includes higher level domain platform
With at least one subordinate domain platform；
Higher level domain platform is connected with least one user terminal, and is put down by wide area network and at least one subordinate domain
One end of platform is connected, and the subordinate domain platform other end is connected with least one headend equipment；
Wherein, higher level domain platform is used for the access request for receiving user terminal transmission, and the access request, which carries, to be needed to be visited
The device identification for the headend equipment asked；It is locally preserving with the headend equipment phase to be visited according to device identification inquiry
Subordinate's domain identifier of the subordinate domain platform of connection, and the access request is sent to subordinate domain corresponding to subordinate's domain identifier
Platform, so that the subordinate domain platform is that the headend equipment to be visited establishes subordinate domain mapping table according to the access request
；The subordinate domain mapping item that the subordinate domain platform is sent is received, according to the subordinate domain mapping item and described
In subordinate domain mapping item corresponding headend equipment to be visited whether belong to different subordinate domain platforms for it is described it is to be visited before
End equipment establishes higher level's domain mapping list item, and by subordinate's domain identifier in higher level's domain mapping list item, higher level's domain mapping address
Sent with higher level's domain mapping port numbers to user terminal；Wherein, when to be visited to belong to the two or more of different subordinate domain platforms
Headend equipment when establishing higher level's domain mapping list item, each headend equipment pair to be visited in the higher level's domain mapping list item established
The higher level's domain mapping port numbers answered are identical；Receive the message of establishing that the user terminal sends, and according to the message of establishing
Content and address and subordinate domain mapping address and subordinate domain mapped port number foundation correspondence in the subordinate domain mapping item
Higher level domain the first network segment address transformation table entries；Receive the access message that the user terminal is sent first, the access message
Carry the device identification and subordinate's domain identifier；According to higher level domain the first network segment address transformation table entries to the visit
The destination address and destination slogan for asking message are changed, and establish higher level domain the second network segment address transformation table entries, and according to institute
Higher level domain the second network segment address transformation table entries are stated to change the source address and source port number of the access message, and by institute
State conversion after access message send to subordinate domain platform corresponding to subordinate's domain identifier so that the subordinate domain platform according to
Subordinate domain the second network segment address transformation table entries and the network segment address transformation table entries of subordinate domain the 3rd to the address of the access message again
It is secondary to be changed, and the access message after the conversion is sent to headend equipment to be visited；
The subordinate domain platform is used for the access request for receiving the user terminal that higher level domain platform is sent, the access
The device identification of headend equipment to be visited is carried in request；It is the headend equipment to be visited according to the access request
Subordinate domain mapping item is established, and the subordinate domain mapping item is sent to higher level domain platform, so that the higher level domain
Platform is that the headend equipment to be visited establishes higher level's domain mapping list item according to the subordinate domain mapping item；Receive on described
The access message for the user terminal that level domain platform is sent first, the access message is according to higher level by higher level domain platform
Message after domain the first network segment address transformation table entries and the conversion of higher level domain the second network segment address transformation table entries；And according to described
Access message destination address and destination slogan and inquire about the subordinate domain mapping item, and according to it is described inquire it is to be visited
The reference address and access end slogan of headend equipment establish subordinate domain the second network segment address transformation table entries；According to the subordinate domain
Two network segment address transformation table entries are changed to the destination address and destination slogan of the access message, establish subordinate domain the 3rd
Network segment address transformation table entries, and according to the network segment address transformation table entries of subordinate domain the 3rd to it is described access message source address and
Source port number is changed, and the access message after the conversion is sent to headend equipment to be visited.
Alternatively, the subordinate domain platform is additionally operable to setting the subordinate domain mapping item and headend equipment to be visited
Standby mark is bound so that the device identification turns into the unique mark of the subordinate domain mapping item, and the subordinate
Subordinate domain mapping address and subordinate domain mapped port number in domain mapping list item will not be with the subordinate domain mapping items
The change of headend equipment reference address and change.
Still optionally further, the subordinate domain platform is additionally operable to receive the user that higher level domain platform is subsequently sent
The access message of terminal；Destination address and mesh according to subordinate domain the second network segment address transformation table entries to the access message
Port numbers changed, and according to the network segment address transformation table entries of subordinate domain the 3rd to it is described access message source address and
Source port number is changed, and the access message after the conversion is sent to headend equipment to be visited.
Still optionally further, the subordinate domain platform is additionally operable to receive the user that higher level domain platform is subsequently sent
The access message of terminal；Destination address and mesh according to subordinate domain the second network segment address transformation table entries to the access message
Port numbers changed, and according to the network segment address transformation table entries of subordinate domain the 3rd to it is described access message source address and
Source port number is changed, and the access message after the conversion is sent to headend equipment to be visited.
As seen from the above-described embodiment, when higher level domain platform is connected with multiple subordinate domain platforms, each subordinate domain platform is again
During the multiple headend equipments of lower extension, the access between multilevel field platform can be completed by device identification and the combination of subordinate's domain identifier,
The function of agent side slogan multiplexing is realized, adds the access profile of higher level domain platform, and is improved between multilevel field platform
Access efficiency.
Those skilled in the art will readily occur to the present invention its after considering specification and putting into practice invention disclosed herein
Its embodiment.The application be intended to the present invention any modification, purposes or adaptations, these modifications, purposes or
Person's adaptations follow the general principle of the present invention and including undocumented common knowledges in the art of the invention
Or conventional techniques.Description and embodiments are considered only as exemplary, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be appreciated that the invention is not limited in the precision architecture for being described above and being shown in the drawings, and
And various modifications and changes can be being carried out without departing from the scope.The scope of the present invention is only limited by appended claim.
Claims (8)
- A kind of 1. access method between multilevel field platform, it is characterised in that methods described be applied to higher level domain platform on, it is described on Level domain platform is connected with least one user terminal, and is connected by wide area network with one end of at least one subordinate domain platform Connect, the subordinate domain platform other end is connected with least one headend equipment, and methods described includes：The access request that user terminal is sent is received, the access request carries the device identification of headend equipment to be visited；The subordinate domain platform being connected with the headend equipment to be visited locally preserved according to device identification inquiry Subordinate's domain identifier, and the access request is sent to subordinate domain platform corresponding to subordinate's domain identifier, so that the subordinate Domain platform is that the headend equipment to be visited establishes subordinate domain mapping item according to the access request；The subordinate domain mapping item that the subordinate domain platform is sent is received, according to the subordinate domain mapping item, Yi Jisuo It is described to be visited to state corresponding headend equipment to be visited in subordinate domain mapping item whether to belong to different subordinate domain platforms Headend equipment establishes higher level's domain mapping list item, and by subordinate's domain identifier in higher level's domain mapping list item, higher level's domain mapping Location and higher level's domain mapping port numbers are sent to user terminal；Wherein, wait to visit when to belong to the two or more of different subordinate domain platforms When the headend equipment asked establishes higher level's domain mapping list item, each headend equipment to be visited in the higher level's domain mapping list item established Corresponding higher level's domain mapping port numbers are identical；Receive the message of establishing that the user terminal sends, and according to the content for establishing message and address and it is described under The network segment address of higher level domain first corresponding to subordinate domain mapping address and the foundation of subordinate domain mapped port number in level domain mapping list item Transformation table entries；Receive the access message that the user terminal is sent first, the access message carry the device identification and it is described under Level domain identifier；The destination address and destination slogan of the access message are entered according to higher level domain the first network segment address transformation table entries Row conversion, establishes higher level domain the second network segment address transformation table entries, and according to the second network segment address of higher level domain transformation table entries pair The source address for accessing message and source port number are changed, and the access message after the conversion is sent under described Level domain identifier corresponding to subordinate domain platform so that the subordinate domain platform according to subordinate domain the second network segment address transformation table entries and under The level network segment address transformation table entries of domain the 3rd are changed again to the address of the access message, and by the access after the conversion Message is sent to headend equipment to be visited.
- 2. according to the method for claim 1, it is characterised in that described according to the subordinate domain mapping item and described In subordinate domain mapping item corresponding headend equipment to be visited whether belong to different subordinate domain platforms for it is described it is to be visited before End equipment is established higher level's domain mapping list item and specifically included：When establishing higher level's domain mapping list item to belong to the two or more of subordinate domain platform headend equipment to be visited, institute Higher level's domain mapping port numbers corresponding to each headend equipment to be visited all differ in higher level's domain mapping list item of foundation.
- 3. method according to claim 1 or 2, it is characterised in that the content for establishing message is the subordinate domain mark Know；And the address for establishing message includes：Destination address, destination slogan, source address and source port number；Wherein, it is described Destination address is higher level's domain mapping address, and the destination slogan is higher level's domain mapping port numbers, the source address It is user terminal address, the source port number is user terminal port numbers.
- 4. according to the method for claim 1, it is characterised in that methods described also includes：Receive the access message that the SS later is sent；The destination address and destination slogan of the access message are entered according to higher level domain the first network segment address transformation table entries Row conversion, and the source address and source port number of the access message are entered according to higher level domain the second network segment address transformation table entries Row conversion, and the access message after the conversion is sent to subordinate domain platform corresponding to subordinate's domain identifier, so that institute State subordinate domain platform to change the address of the access message again, and the access message after the conversion is sent to treating The headend equipment of access.
- 5. the method according to claim 1 or 4, it is characterised in that methods described also includes：Receive the reply message for the headend equipment to be visited that subordinate domain platform corresponding to subordinate's domain identifier is sent；The destination address and destination slogan of the reply message are entered according to higher level domain the first network segment address transformation table entries Row conversion, and the source address and source port number of the reply message are entered according to higher level domain the second network segment address transformation table entries Row conversion, and the reply message after the conversion is sent to the user terminal.
- 6. the access system between a kind of multilevel field platform, it is characterised in that the system includes higher level domain platform and at least one Subordinate domain platform；Higher level domain platform is connected with least one user terminal, and passes through wide area network and at least one subordinate domain platform One end is connected, and the subordinate domain platform other end is connected with least one headend equipment；Wherein, higher level domain platform is used for the access request for receiving user terminal transmission, and the access request carries to be visited The device identification of headend equipment；It is connected according to what device identification inquiry locally preserved with the headend equipment to be visited Subordinate domain platform subordinate's domain identifier, and the access request is sent to subordinate domain corresponding to subordinate's domain identifier and put down Platform, so that the subordinate domain platform is that the headend equipment to be visited establishes subordinate domain mapping table according to the access request ；The subordinate domain mapping item that the subordinate domain platform is sent is received, according to the subordinate domain mapping item and described In subordinate domain mapping item corresponding headend equipment to be visited whether belong to different subordinate domain platforms for it is described it is to be visited before End equipment establishes higher level's domain mapping list item, and by subordinate's domain identifier in higher level's domain mapping list item, higher level's domain mapping address Sent with higher level's domain mapping port numbers to user terminal；Wherein, when to be visited to belong to the two or more of different subordinate domain platforms Headend equipment when establishing higher level's domain mapping list item, each headend equipment pair to be visited in the higher level's domain mapping list item established The higher level's domain mapping port numbers answered are identical；Receive the message of establishing that the user terminal sends, and according to the message of establishing Content and address and subordinate domain mapping address and subordinate domain mapped port number foundation correspondence in the subordinate domain mapping item Higher level domain the first network segment address transformation table entries；Receive the access message that the user terminal is sent first, the access message Carry the device identification and subordinate's domain identifier；According to higher level domain the first network segment address transformation table entries to the visit The destination address and destination slogan for asking message are changed, and establish higher level domain the second network segment address transformation table entries, and according to institute Higher level domain the second network segment address transformation table entries are stated to change the source address and source port number of the access message, and by institute State conversion after access message send to subordinate domain platform corresponding to subordinate's domain identifier so that the subordinate domain platform according to Subordinate domain the second network segment address transformation table entries and the network segment address transformation table entries of subordinate domain the 3rd to the address of the access message again It is secondary to be changed, and the access message after the conversion is sent to headend equipment to be visited；The subordinate domain platform is used for the access request for receiving the user terminal that higher level domain platform is sent, the access request In carry the device identification of headend equipment to be visited；Established according to the access request for the headend equipment to be visited Subordinate domain mapping item, and the subordinate domain mapping item is sent to higher level domain platform, so that higher level domain platform It is that the headend equipment to be visited establishes higher level's domain mapping list item according to the subordinate domain mapping item；Receive the higher level domain The access message for the user terminal that platform is sent first, the access message is according to higher level domain the by higher level domain platform Message after one network segment address transformation table entries and the conversion of higher level domain the second network segment address transformation table entries；And according to the access Message destination address and destination slogan inquire about the subordinate domain mapping item, and according to the front end to be visited inquired The reference address and access end slogan of equipment establish subordinate domain the second network segment address transformation table entries；According to the net of subordinate domain second Sector address transformation table entries are changed to the destination address and destination slogan of the access message, establish the network segment of subordinate domain the 3rd Address conversion list item, and source address and source according to the network segment address transformation table entries of subordinate domain the 3rd to the access message Slogan is changed, and the access message after the conversion is sent to headend equipment to be visited.
- 7. system according to claim 6, it is characterised in that the subordinate domain platform is additionally operable to subordinate's domain mapping The device identification of list item and headend equipment to be visited is bound so that the device identification turns into the subordinate domain mapping table Unique mark, and subordinate domain mapping address in the subordinate domain mapping item and subordinate domain mapped port number will not be with The change of the headend equipment reference address in the subordinate domain mapping item and change.
- 8. the system according to claim 6 or 7, it is characterised in that the subordinate domain platform is additionally operable to receive the higher level The access message for the user terminal that domain platform is subsequently sent；According to subordinate domain the second network segment address transformation table entries to institute State the destination address for accessing message and destination slogan is changed, and according to the network segment address transformation table entries of subordinate domain the 3rd The source address and source port number of the access message are changed, and the access message after the conversion is sent to waiting to visit The headend equipment asked.
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| CN108446283B (en) * | 2017-02-16 | 2021-05-11 | 杭州海康威视数字技术股份有限公司 | Data storage method and device |
| CN111093056A (en) * | 2019-11-15 | 2020-05-01 | 重庆中科云从科技有限公司 | Security monitoring management method, system, equipment and medium based on multi-stage intelligent gateway |
| CN112328704B (en) * | 2020-11-03 | 2024-02-23 | 成都中科大旗软件股份有限公司 | Method, system, computer device and storage medium for implementing multiple data source joint inquiry |
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