CN111935336B - IPv 6-based network governance method and system - Google Patents
IPv 6-based network governance method and system Download PDFInfo
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- CN111935336B CN111935336B CN202010829140.5A CN202010829140A CN111935336B CN 111935336 B CN111935336 B CN 111935336B CN 202010829140 A CN202010829140 A CN 202010829140A CN 111935336 B CN111935336 B CN 111935336B
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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
- H04L61/2503—Translation of Internet protocol [IP] addresses
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
- H04L67/1004—Server selection for load balancing
- H04L67/1023—Server selection for load balancing based on a hash applied to IP addresses or costs
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
Abstract
The invention discloses a network governance method and a system based on IPv6, wherein the method comprises the following steps: providing a route of a first IP address to an external network through a front-end network device, and receiving a first message with a destination address of the first IP address, wherein the first message adopts different first IP addresses based on different accessed digital objects; and determining a second IP address of the server carried according to the digital object, converting the destination address of the first message from the first IP address to the second IP address, and then sending the first message to a network of the corresponding server. The invention can expand the application range based on IPv6 and improve the implementation and management capacity of network application.
Description
Technical Field
The invention relates to the technical field of computer network communication, in particular to a network management method and system based on IPv 6.
Background
In conventional networks, IP (Internet Protocol ) is used to regulate the exchange and routing of packet information messages in the internet, and is typically assigned to physical devices accessing the internet, such as routers, switches, servers, computers, handsets, etc. However, in the IPv4 age, where the distribution is basically depleted, this use is reasonable and still limited by the bottleneck in the number of addresses. However, IPv6, which is the next generation version of IPv4, upgrades the address from the original 32 bits to 128 bits, the total number of addresses being 128 times 2, which is so large that it cannot be imagined, and it is said that each sand worldwide can be addressed. If the use of IPv6 is still limited to the allocation of physical devices, this obviously has a significant deviation from the problem of internet administration, and it is difficult to bring about a revolutionary impact on the development of the internet, and especially the upper layer applications and information content carried by the devices do not widely utilize the core features of IPv 6.
Disclosure of Invention
The invention aims to provide a network governance method and system based on IPv6, which solve the technical problem that the IPv6 address is single in use and cannot widely meet the requirement of specific network functions in continuously developed application scenes in the prior art.
In order to solve the technical problems, the IPv 6-based network governance method of the invention comprises the following steps:
providing a route of a first IP address to an external network through a front-end network device, and receiving a first message with a destination address of the first IP address, wherein the first message adopts different first IP addresses based on different accessed digital objects;
and determining a second IP address of the server carried according to the digital object, converting the destination address of the first message from the first IP address to the second IP address, and then sending the first message to a network of the corresponding server.
As a further improvement of the above-mentioned IPv 6-based network governance method of the present invention, the correspondence between the first IP address and the second IP address is determined by an address management device that allocates an IP address to a digital object in a bearer server.
As a further improvement of the above-mentioned IPv 6-based network governance method of the present invention, when backup or migration of the digital object exists between servers, load balancing is implemented by modifying the correspondence between the first IP address and the second IP address.
As a further improvement of the IPv 6-based network governance method, the destination address of the first message is monitored, and metadata associated with the first message is determined according to the first IP address to classify, so that flow statistics or network flow control is realized.
As a further improvement of the above-mentioned network management method based on IPv6 of the present invention, when the destination address of the first packet directly uses the second IP address of the bearer server, the first packet is discarded.
In order to solve the above technical problems, the present invention provides an IPv 6-based network management system, comprising:
a receiving unit, configured to provide, through a pre-network device, a route of a first IP address to an external network, and receive a first packet having a destination address that is the first IP address, where the first packet adopts different first IP addresses based on different accessed digital objects;
and the forwarding unit is used for determining a second IP address of the loaded server according to the digital object, converting the destination address of the first message from the first IP address to the second IP address, and then sending the first message to the network of the corresponding server.
As a further improvement of the above-described IPv 6-based network administration system of the present invention, the correspondence between the first IP address and the second IP address is determined by an address management device that assigns an IP address to a digital object in the bearer server.
As a further improvement of the above-mentioned IPv 6-based network management system of the present invention, when the digital object has backup or migration between servers, the forwarding unit implements load balancing by modifying the correspondence between the first IP address and the second IP address.
As a further improvement of the above-mentioned network management system based on IPv6, the system further includes a monitoring unit, where the monitoring unit monitors a destination address of the first packet, determines metadata associated with the first packet according to the first IP address to classify the metadata, and implements flow statistics or network flow control.
As a further improvement of the above-mentioned IPv 6-based network management system of the present invention, when the destination address of the first packet directly uses the second IP address of the bearer server, the forwarding unit discards the first packet.
Compared with the prior art, the invention addresses different IP addresses for each digital object, accesses the message of the specific digital object through the IP address mark in the public network, and converts the destination address of the message when reaching the server bearing the digital object so as to support the topological structure of the server network. The invention can expand the application range based on IPv6 and improve the implementation and management capacity of network application.
Other features and advantages of the present invention will become more apparent from the following detailed description of embodiments of the present invention, which is to be read in connection with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments described in the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of an IPv 6-based network management method according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of an IPv 6-based network topology according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of an IPv 6-based network management system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the embodiments shown in the drawings. However, these embodiments are not intended to limit the present invention, and variations in structure, method, or function that would occur to one skilled in the art based on these embodiments are included in the scope of the present invention.
It should be noted that in different embodiments, the same reference numerals or signs may be used, but these do not represent absolute relationships in structure or function. Also, reference to "first" and "second" in the embodiments does not represent an absolute distinction in structure or function, and these are merely for convenience of description.
As described above, IPv6 is a next-generation version of internet protocol, and one of its biggest changes is to extend a very sufficient address space, providing unlimited possibilities for allocation of IP addresses. With the rise of cloud computing and edge computing, in the embodiment of the invention, a novel evolution IPv6 allocation and application thought is provided, the IP address allocation focusing on the upper layer application and information content carried by the equipment is expanded, and the IP address and the digital object are associated and bound. The digital object specified by the IP address is specified from the allocation rules, and the application management department is given the ability to learn the identity and attribute information of the accessed digital object from the IP address itself.
As shown in fig. 1, in an embodiment of the present invention, a flow chart of an IPv 6-based network management method is shown. For digital objects in the network, such as short video, song audio, etc., which are actually stored on a specific server, some other digital objects that need to be controlled in a specific manner, such as tag information in an electronic tag, etc., also need a device that acts as a server to communicate with the electronic tag. Therefore, when a user accesses a desired digital object through a network, the user must first reach a corresponding server, and in the embodiment of the present invention, the IP address of the server is inconsistent with the IP address of the accessed digital object, which needs to solve the problem of the relationship between the two IP addresses, specifically, the IPv 6-based network governance method specifically includes the following steps:
step S1, providing a route of a first IP address to an external network through a front-end network device and receiving a first message with a destination address of the first IP address, wherein the first message adopts different first IP addresses based on different accessed digital objects. In order to directly embody the digital object in the network and realize the purpose of network perception service, in this embodiment, a specific access message may use different first IP addresses as destination addresses according to different accessed digital objects, and the different digital objects associated with the message are marked by the different first IP addresses, preferably, the first IP addresses include at least a first address segment for representing a network prefix, a second address segment for representing a digital identifier, and a third address segment for representing a type of the digital object, where the first address segment is usually used for efficient route summarization during addressing, the second address segment may ensure that the corresponding digital object is uniquely determined, and the third address segment may intuitively determine the specific type of the associated digital object, and may split the third address segment into a plurality of type code address segments according to specific requirements, and may reflect the file format, the data size, the object classification, and the like of the digital object at the same time. Further, the third address segment is between the first address segment and the second address segment in the 128-bit IPv6 address, and the content of the third address segment can be accurately determined by the address bits of the addressing rule.
The IP address assignment of a digital object may be manually de-statically assigned based on specific addressing rules, but address conflicts between digital objects need to be avoided. In further embodiments, the IP address of the digital object is performed by a specific address management device, and when a new digital object is stored in the corresponding server, the address management device assigns an independent IP address to the corresponding digital object, and the corresponding address field is determined according to the rule described above, or the address is assigned from the free address pool, and then the third address field is configured according to the attribute of the digital object.
The address management device may be integrated in a pre-network device, as shown in fig. 2, where the pre-network device 20 is configured to connect to one or more servers 30 in a server network, where the servers 30 store various digital objects accordingly, and where the pre-network device 20 performs the function of network management on the servers 30 and the digital objects carried on the servers 30, and also performs the function of routing and forwarding with an external network. Specifically, the pre-network device 20 may directly be a border gateway connected to an external network, or a server for virtualizing network functions may serve as a network layer device. When a digital object in any server 30 is assigned an IP address, the relationship between the corresponding digital object and the server is notified to the pre-network device 20, specifically, the relationship between the first IP address assigned by the digital object and the second IP address owned by the server, and the pre-network device 20 may share the information of IP address assignment with the address management device.
After the corresponding IP addresses are allocated to the servers and the digital objects in the network, how to use the IP addresses to realize the message communication between the servers and the digital objects is also needed to be solved. The premise of implementing the message communication is to let the external network know the reachable route of the specific IP address, and thus, as shown in fig. 2, let the access request of any terminal 10 reach the server 30 where the digital object is located. Specifically, the route of the first IP address is provided to the external network through the pre-network device 20, that is, the pre-network device 20 exchanges route information or link state information about the first IP address with other routers through the network, so that it can be ensured that the router in the network can reflect the route reaching the first IP address from its own routing table, thereby reaching the server 30 through the hop method of the pre-network device 20. After determining the forwarding manner of the datagram by using the specific routing protocol, the pre-network device 20 may continuously receive the first message sent from the external network terminal 10, where the first message is a message that the terminal 10 initiates access to the corresponding digital object, and the destination address is a first IP address corresponding to the digital object.
Further, to optimize the routing of the wide area network, the design may be made for the IPv6 address of the digital object, in combination with a corresponding gateway and CDN (Content Delivery Network ), several embodiments will be briefly listed below.
Example 1: and writing an actual routing address by using an embedded extension header 'target option header' of the IPv6 protocol, and separating the routing address from the application address to guide the flow to the pre-network equipment.
Example 2: and using SDN protocol to route the IPv6 address with the special header label to the front-end network equipment through a preset SDN traffic path.
Example 3: and reasonably distributing address bits of the first address segment, the second address segment and the third address segment in the IPv6 address, realizing reasonable subnet prefix design and playing a role of route aggregation.
And step S2, determining a second IP address of the loaded server according to the digital object, converting the destination address of the first message from the first IP address to the second IP address, and then sending the first message to a network of the corresponding server. In step S1, after receiving the first message through the pre-network device, the first message needs to be forwarded to a corresponding server, that is, a server where the digital object associated with the first message is located. Because the first IP address of the digital object is adopted in the first message, the first IP address of the digital object cannot be directly received by the server, and the second IP address of the server where the digital object is located needs to be determined according to the first IP address. As described above, the IP address allocation of the digital object also establishes the server where the corresponding digital object is located, so that the correspondence between the first IP address and the second IP address is determined, and the second IP address, that is, the second IP address corresponding to the server carried by the digital object, can be obtained by searching against the correspondence according to the first IP address in the first message. After the second IP address is obtained, the destination address of the received first message is converted from the first IP address to the second IP address, and the first message can be received by the server where the digital object is located at the moment, so that the first message is sent to the network of the corresponding server through the preposed network equipment, and the first message is forwarded to the corresponding server according to the second IP address in the first message in the network of the corresponding server. After receiving the first message, the server may communicate with the terminal that initiates access to the corresponding digital object according to the content in the first message, e.g., return the content of the corresponding digital object to the corresponding terminal.
Based on the corresponding relation between the first IP address and the second IP address, the front-end network device serves as network device for address conversion, and converts the virtual application message in the network into a message of the entity destination address. Further, the entity device target can also be controlled by controlling the corresponding relation between the first IP address and the second IP address. For example, when the same digital object has backups on a plurality of servers, the same digital object is theoretically allocated with the same IP address, if the target server has a fault problem or a server with better service quality exists, the state of each server can be continuously monitored by the prepositive network device to determine the optimal target server, so that the corresponding relation between the first IP address and the second IP address stored by the prepositive network device is updated, and the second IP address of the server with the optimal detection result is modified, so that the corresponding first message can be guided to the server with the best service quality, and the effect of load balancing is achieved. In addition, when the digital object allocated with the first IP address is migrated from the first server to the second server, the second IP address in the correspondence between the first IP address and the second IP address may be modified to be the second IP address of the second server, and at this time, the corresponding first message will reach the second server, and communicate with the second server to obtain the corresponding digital object.
As can be seen from fig. 2, in the present invention, since the destination address in the packet is configured by the first IP address allocated by the digital object, the traffic of the first packet in the network can be regarded as a line of several services according to different digital objects, and the IPv6 defines the service type so that the network perceives the service, so that differentiated services and refined operations can be further provided. It should be added that, if the destination address configured by the first message for accessing the specific digital object is the second IP address of the corresponding server, the communication can be achieved by theoretically reaching the corresponding server, but the effect of the network perceived service cannot be achieved, so preferably, when the first message address is converted through the pre-network device, when the destination address of the received first message directly uses the second IP address of the bearer server, the destination address can be specifically matched with the managed server address, if the matching is successful, it is indicated that the terminal for sending the first message does not send the first message in a manner of guiding the digital object, at this time, the first message is discarded, and meanwhile, an unreachable error prompt for the destination can be returned to the sending terminal, so that any terminal must use the first IP address to encapsulate the first message when accessing the specific digital object, and the first message exposes the corresponding service attribute in the network layer can be forced.
When the application environment of the network sensing service is realized, all the first messages can be classified at this time, and the destination address in the first message is extracted when the first messages are monitored. Further, a corresponding DNS server may be further configured, where the DNS server stores a correspondence between the corresponding first IP address and metadata corresponding to the digital object, and the corresponding DNS server may be synchronized with the address management device. When the destination address of the monitoring first message is extracted, the DNS server may be queried using the corresponding first IP address, so as to obtain metadata of the corresponding digital object, and more detailed digital object types, attributes, and the like may be queried. When various attribute information of different first messages is determined, corresponding classification analysis can be performed, such as classification is performed according to variety videos, movie videos, television drama videos and the like, then different strategies can be adopted for processing different classifications according to actual needs, and processing operations such as flow statistics or network flow control can be realized, so that more refined network management capability can be increased.
As shown in fig. 3, in an embodiment of the present invention, an IPv 6-based network management system is shown. The IPv 6-based network management system comprises a receiving unit U1 and a forwarding unit U2, wherein the receiving unit U1 is used for processing the routing relation of the network, so that the first message in a corresponding address range is guaranteed to be received, and the forwarding unit U2 is used for processing at least the destination address of the first message, so that the first message can enter a specified server network.
Specifically, the receiving unit U1 is configured to provide, through the pre-network device, a route of the first IP address to the external network, and receive a first packet with a destination address being the first IP address, where the first packet adopts a different first IP address based on different accessed digital objects. As shown in fig. 2, the pre-network device 20 is interposed between the network of the communication terminal 10 and the network where the server 30 is located, and may allocate a corresponding first IP address to the digital object in the server 30 and a corresponding second IP address to the server 30, share corresponding information to the DNS server as described above, and provide public query for the information of the digital object corresponding to the IP address, where in more embodiments, the metadata correspondence of the digital object may also be directly exchanged by the server 30 to the corresponding DNS server. Further, the pre-network device 20 may exchange corresponding routing information to the external network based on the first IP address allocated by the digital object in the server 30, so that the reachable router information of the corresponding digital object is recorded in the router table, so that the corresponding first packet is forwarded to the pre-network device 20 based on the corresponding router table information to realize forwarding of the next hop. Therefore, the pre-network device 20 may receive the first packet corresponding to the address segment, and then perform the next-hop processing according to the destination address in the first packet.
And the forwarding unit U2 is used for determining a second IP address of the loaded server according to the digital object, converting the destination address of the first message from the first IP address to the second IP address, and then sending the first message to the network of the corresponding server. As described above, the pre-network device may be capable of knowing the server where the digital object is located, and specifically, may be a relationship between the first IP address and the second IP address, for example, if the first digital object is stored on the first server, there is a mapping relationship between the first IP address of the first digital object and the second IP address of the first server that can be queried. Accordingly, the correspondence between the first IP address and the second IP address is determined by an address management device that assigns an IP address to the digital object in the bearer server, preferably the address management device is designed integrally with the pre-network device. When the relation between the first IP address and the second IP address is determined, the destination address in the first message can be converted from the first IP address to the corresponding second IP address when the first message is forwarded, so that normal addressing forwarding can be realized in the network where the server is located, the internal topological structure of the network where the server is located does not need to be reconstructed, and the first message with the converted destination address is sent to the corresponding server network.
When forwarding is realized, the forwarding unit U2 converts the destination address of the first message into an IP address of the corresponding server to reach the corresponding server, so that on the other hand, control over reaching the server can also be realized. When a plurality of servers exist in the server network, different digital objects can be stored on different servers according to different strategies or needs, and the server where the digital objects are located is also determined when the IP addresses are allocated to the digital objects, so that forwarding control is performed according to the corresponding relation between the first IP address and the second IP address. However, the association relationship between the digital object and the corresponding server is not constant, and may be changed or migrated due to a fault or management requirement, and at this time, the forwarding path may be modified by updating the correspondence between the first IP address and the second IP address, so as to achieve a corresponding load balancing effect.
Further, since the forwarded first packet adopts the IP address of the digital object to encapsulate the destination address in the public network, the type of the first packet can be analyzed based on the destination address of the first packet, thereby determining the corresponding policy management for the first packet. Specifically, the network is provided with a monitoring unit, which can monitor the flow of the first message coming and going, further analyze the destination address of the first message, determine the metadata associated with the first message, such as the classification information of the digital object in the first message, classify the first message according to different information classifications, and adopt the same strategy control for the first message flow of the same type, thereby realizing operations such as flow statistics or network flow control, and effectively improving the level of network management. In the above embodiment, the flow statistics or network flow control can be achieved based on that all destination addresses in the first message are IP addresses of the digital objects, but if the terminal uses the IP address of the server where the digital objects are located when sending the first message, this will affect the accurate effect of the flow statistics or network flow control. Therefore, in the preferred embodiment, the forwarding unit further determines the destination to which the destination address points when the pre-network device receives the first packet, and when the destination address of the first packet directly uses the second IP address of the bearer server, the forwarding unit discards the first packet and further returns an error prompt that the destination is not reachable to the sending terminal, so that the terminal can be forced to send the first packet according to the IP address of the digital object, and the network management effect is ensured. It should be noted that, for the specific embodiment of the IPv 6-based network administration system, reference may be made to the specific embodiment of the IPv 6-based network administration method.
In connection with the technical solutions disclosed herein, it may be directly embodied as hardware, as a software module executed by a control unit, or as a combination of both, i.e. one or more steps and/or a combination of one or more steps, corresponding to either the respective software module of a computer program flow or the respective hardware module, e.g. an ASIC (Application Specific Integrated Circuit ), an FPGA (Field-Programmable Gate Array, field programmable gate array) or other programmable logic device, a discrete gate or crystal logic device, a discrete hardware component, or any suitable combination thereof. For convenience of description, the above apparatus is described as being functionally divided into various modules, and of course, the functions of each module may be implemented in one or more pieces of software and/or hardware when implementing the present application.
From the description of the above embodiments, it will be apparent to those skilled in the art that the present application may also be implemented by means of software plus necessary general hardware platforms. Based on such understanding, the technical solutions of the present application may also be embodied in the form of a software product, in essence or in part contributing to the prior art. The software may be executed by a micro-control unit, and may include one or more micro-control units of any type, including but not limited to a microcontroller, DSP (Digital Signal Processor, digital signal control unit), or any combination thereof, depending on the desired configuration. The software is stored in a memory, such as a volatile memory (e.g., random access memory, etc.), a non-volatile memory (e.g., read only memory, flash memory, etc.), or any combination thereof.
In summary, the present invention addresses each digital object with a different IP address, accesses a message of a specific digital object in a public network through an IP address tag, and converts a destination address of the message when reaching a server carrying the digital object, so as to support a topology structure of the server network. The invention can expand the application range based on IPv6 and improve the implementation and management capacity of network application.
It should be understood that although the present disclosure describes embodiments, not every embodiment is described in terms of a single embodiment, and that this description is for clarity only, and that the skilled artisan should recognize that the embodiments may be combined in any suitable manner to form other embodiments that will be understood by those skilled in the art.
The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.
Claims (2)
1. The IPv 6-based network governance method is characterized by comprising the following steps:
providing a route of a first IP address to an external network through a front-end network device, and receiving a first message with a destination address of the first IP address, wherein the first message adopts different first IP addresses based on different accessed digital objects;
determining a second IP address of the server carried according to the digital object, converting the destination address of the first message from the first IP address to the second IP address, and then sending the first message to a network of the corresponding server;
the corresponding relation between the first IP address and the second IP address is determined by address management equipment for distributing IP addresses to digital objects in a bearing server;
when backup or migration exists between the servers, the digital object realizes load balance by modifying the corresponding relation between the first IP address and the second IP address;
the destination address of the first message is monitored, metadata associated with the first message is determined according to the first IP address to classify, and flow statistics or network flow control is achieved;
and discarding the first message when the destination address of the first message directly uses the second IP address of the bearer server.
2. An IPv6 based network administration system, comprising:
a receiving unit, configured to provide, through a pre-network device, a route of a first IP address to an external network, and receive a first packet having a destination address that is the first IP address, where the first packet adopts different first IP addresses based on different accessed digital objects;
the forwarding unit is used for determining a second IP address of the loaded server according to the digital object, converting the destination address of the first message from the first IP address to the second IP address, and then sending the first message to a network of the corresponding server;
the corresponding relation between the first IP address and the second IP address is determined by address management equipment for distributing IP addresses to digital objects in a bearing server;
when backup or migration exists between the servers, the forwarding unit realizes load balancing by modifying the corresponding relation between the first IP address and the second IP address;
the system also comprises a monitoring unit, wherein the monitoring unit monitors the destination address of the first message, determines metadata associated with the first message according to the first IP address to classify, and realizes flow statistics or network flow control;
when the destination address of the first message directly uses the second IP address of the bearer server, the forwarding unit discards the first message.
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