CN117354196B - Link detection method and device based on network interface - Google Patents

Link detection method and device based on network interface Download PDF

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Publication number
CN117354196B
CN117354196B CN202311659538.9A CN202311659538A CN117354196B CN 117354196 B CN117354196 B CN 117354196B CN 202311659538 A CN202311659538 A CN 202311659538A CN 117354196 B CN117354196 B CN 117354196B
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link
detected
message
network interface
detection
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CN117354196A (en
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王永勇
侯宇鑫
莫炜业
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Guangzhou Tongze Kangwei Technology Co ltd
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Guangzhou Tongze Kangwei Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
    • H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0823—Errors, e.g. transmission errors
    • H04L43/0847—Transmission error
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
    • 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
    • H04L67/14—Session management
    • H04L67/143—Termination or inactivation of sessions, e.g. event-controlled end of session
    • H04L67/145—Termination or inactivation of sessions, e.g. event-controlled end of session avoiding end of session, e.g. keep-alive, heartbeats, resumption message or wake-up for inactive or interrupted session
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/163—In-band adaptation of TCP data exchange; In-band control procedures
    • 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

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Cardiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Computer Security & Cryptography (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The invention discloses a link detection method and a link detection device based on a network interface, which respond to a link detection signal, firstly detect and acquire a first time message count of the network interface to be detected corresponding to the link to be detected, acquire a second time message count according to a query period secondary detection interface, and determine whether the first time message count is smaller than the second time message count; if the link is not smaller than the interface, determining that the link is abnormal, and then sending a detection message to the target server so that the target server feeds back the message to the interface; and detecting the third time message count at the interface after feedback, and further determining the detection result of the link to be detected according to the comparison result of the third time message count and the second time message count. The invention realizes the detection of the link by sending the detection message to the target server to trigger the server to feed back the first feedback message, does not need to preset or manually configure the detection address, and simultaneously realizes the detection of the link in the network environment which can not carry out ping detection.

Description

Link detection method and device based on network interface
Technical Field
The present invention relates to the field of network communications technologies, and in particular, to a method and an apparatus for detecting a link based on a network interface.
Background
Since CPE devices act as intermediate devices in the network, it is often necessary to implement link detection as a function of network failure recovery. However, in some network environments, the CPE device cannot use ping detection for the link, and thus, how to detect the link becomes a problem that must be solved when the CPE device is in a network environment where ping detection for the link is not possible.
The prior art comprises two types, namely, starting keepalive detection through two ends of a TCP (transmission control protocol) connection, adding a service layer heartbeat message, and maintaining the keepalive connection by respective kernel TCP protocol stacks at the two ends. However, the CPE device serves as an intermediate device of the network, only provides one internet access, and the CPE device does not belong to both ends of the TCP connection, so that the link detection cannot be performed using the keepalive mechanism of the TCP.
Disclosure of Invention
The invention provides a link detection method and a link detection device based on a network interface, which are used for realizing the technical effect of detecting and keeping alive a link in an environment in which the link cannot be detected in a ping manner.
In order to solve the technical problems, the invention provides a link detection method based on a network interface, which comprises the following steps:
Responding to a link detection signal, detecting and obtaining a first time message count of a network interface to be detected corresponding to a link to be detected, detecting and obtaining a second time message count of the network interface to be detected according to a preset query period, and then determining whether the first time message count is smaller than the second time message count;
if the first time message count is determined to be greater than or equal to the second time message count, determining that an abnormality occurs in the link to be detected corresponding to the network interface to be detected, and sending a first detection message to a target server so that the target server sends a first feedback message to the network interface to be detected;
and after a preset time period, detecting to obtain a third time message count of the network interface to be detected, and determining a detection result of the link to be detected according to a second comparison result of the third time message count and the second time message count.
The link detection method provided by the invention responds to a link detection signal, and firstly detects and determines the first time message count of the network interface to be detected corresponding to the link to be detected, namely, determines the initial message receiving number of each network interface to be detected, re-detects the message receiving data of each network interface to be detected according to a preset query period, then obtains the second time message count, compares the specific values of the two data, and determines whether the first time message count, namely, the specific value of the initial message receiving data is smaller than the second time message count. If the first time message count is determined to be smaller than the second time message count, the link to be detected is determined to be normal in operation without performing fault processing on the link to be detected, and if the first time message count is determined to be larger than or equal to the second time message count, the network interface to be detected is determined to be abnormal, and further detection is performed on the network interface to be detected to determine whether the corresponding link to be detected is faulty.
If the first time message count is detected to be greater than or equal to the second time message count, the fact that the network interface to be detected corresponding to the link to be detected does not receive new messages in a preset query period is indicated that the message received by the link to be detected is abnormal, or a calculation error occurs in a detection algorithm for querying the message receiving number of the network interface to be detected, so that further barrier removal processing is needed to be carried out on the network interface to be detected. According to the link detection method provided by the invention, the first detection message is sent to the target server, so that the target server is triggered to feed back the first feedback message to the network interface to be detected.
After the system finishes sending the first detection message for a period of time, detecting the message receiving data of the network interface to be detected again to obtain a corresponding third time message count, comparing the third time message count with the second time message count, determining whether the network interface to be detected receives the first feedback message fed back by the target server or not, and determining the detection result of the link to be detected according to the comparison result of the first time message and the second time message count, namely determining whether the link to be detected has a fault or not. The link detection method provided by the invention realizes the detection of the link by sending the first detection message to the target server to trigger the server to feed back the first feedback message, and meanwhile, the detection of the link in a network environment which cannot perform ping detection is realized without presetting or manually configuring a detection address.
As a preferred example, after the determining that the first time packet count is greater than or equal to the second time packet count, the method further includes:
performing bit adding operation on the numerical value of the first overtime data, and comparing the added first overtime data with a preset overtime threshold value to obtain a corresponding first comparison result; the first timeout data is used for calculating the times that the network interface to be detected does not receive the message;
if the first comparison result is that the first overtime data is larger than or equal to the overtime threshold, determining that the link to be detected corresponding to the network interface to be detected has a fault, triggering an alarm signal and executing a keep-alive mechanism on the link to be detected;
and if the first comparison result is that the first overtime data is smaller than the overtime threshold, determining that the link to be detected corresponding to the network interface to be detected is abnormal.
In order to improve the accuracy of fault detection on a link, after the link detection method provided by the invention determines that the first message data is greater than or equal to the second message data, the first timeout data is subjected to bit-to-one operation, which indicates that the number of times that the to-be-detected network interface does not receive a message is increased by one, namely the number of times that the to-be-detected network interface misses the message is increased by one, and the first timeout data subjected to the addition operation is compared with a timeout threshold preset in a system, so that whether the number of times that the to-be-detected link corresponding to the to-be-detected network interface does not receive the message reaches an alarm standard or not is judged.
If the first overtime data is determined to be greater than or equal to the overtime threshold, the condition that the to-be-detected link corresponding to the to-be-detected network interface fails to the receiving function of the message is indicated, the alarm signal of the system is triggered, and a keep-alive mechanism is executed on the to-be-detected link, so that the failure detection efficiency and the keep-alive maintenance efficiency for the link are improved; if the first overtime data is smaller than the overtime threshold, the condition that the to-be-detected link corresponding to the to-be-detected network interface is abnormal and failure is not determined to occur is indicated, so that the link is further detected, and the accuracy and reliability of link failure detection are improved.
As a preferred example, after the determining that the to-be-detected link corresponding to the to-be-detected network interface is abnormal, the method further includes:
sequencing all messages in a message database according to the termination active time to obtain a first message table; the message database records message information corresponding to a plurality of messages, wherein the message information comprises a sending serial number, a receiving serial number and a receiving window of each message;
screening and matching are sequentially carried out in a connection tracking table according to the message information corresponding to each message in the first message table, and a server corresponding to TCP link information obtained by matching is determined to be the target server;
The connection tracking table is generated by integrating a plurality of pieces of TCP (transmission control protocol) link information, and the plurality of pieces of TCP link information are generated when the TCP link information is in data link with a plurality of servers through a TCP protocol.
After the system determines that the link to be detected corresponding to the network interface to be detected is abnormal, sequencing a plurality of messages in a message database according to the termination active time to obtain a first message table, determining the message range of the detected link abnormality, and carrying out matching screening on the message information of each message in the first message table obtained by integration and the message information of each message in the connection tracking table to determine the message of the first message table and the message of the server which are in data link with each other through a TCP protocol, thereby determining the target server and providing data support for further fault detection of the subsequent link to be detected.
After determining that an abnormal link exists, the link detection method provided by the invention firstly determines a first message table which is the approximate range of the abnormal link through the messages in the message database, then further determines the message which has TCP (transmission control protocol) link with the server through the preset connection tracking table and the first message table, and determines the target server according to the TCP link information corresponding to the message, thereby realizing the triggering of the feedback message by the subsequent target server.
As a preferred example, the sending a first detection message to the target server to enable the target server to send a first feedback message to the network interface to be detected specifically includes:
according to the target server, corresponding TCP link information is called, the first detection message is constructed based on the TCP link information, and a destination address corresponding to the target server is determined;
and sending the first detection message to the target server according to the destination address so that the target server is triggered, and generating the first feedback message to be fed back to the network interface to be detected.
After the target server is determined, the system invokes TCP link information corresponding to the target server, constructs a first detection message based on the TCP link information, and determines the IP address of the target server, namely the destination address. After the determination, the system sends the first detection message according to the determined destination address, so that the target server is triggered and executes a message feedback function, and feeds back the first feedback message to the network interface to be detected, thereby determining whether the link to be detected has a fault or not, and improving the accuracy and reliability of link detection.
As a preferred example, the determining the detection result of the to-be-detected link according to the second comparison result of the third time packet count and the second time packet count specifically includes:
If the second comparison result is that the third time message count is larger than the second time message count, determining that the link to be detected is in a normal running state, resetting first timeout data and returning to detecting to obtain the first time message count of the network interface to be detected;
if the second comparison result is that the third time message count is smaller than or equal to the second time message count, determining that the link to be detected fails, triggering an alarm signal, executing a keep-alive mechanism on the link to be detected, and generating a failure analysis report and sending the failure analysis report to the first terminal.
In order to further improve the efficiency and accuracy of fault detection of the link, the link detection method provided by the invention determines the detection result of the link to be detected according to the second comparison result after the second comparison result is obtained.
If the detection result is that the link to be detected is in a normal running state, the first overtime data can be reset to avoid that the data accumulation is not updated, so that the subsequent judgment on the link fault is affected, and the step of detecting the message count at the first moment is returned; if the detection result is that the link to be detected fails, an alarm signal of the system is triggered, a keep-alive mechanism is executed on the link to be detected, the barrier removing efficiency and the maintenance efficiency of the link to be detected are improved, meanwhile, a failure analysis report is generated and sent to a first terminal, namely a link maintainer, the working efficiency of the link maintainer is improved, and the long-term failure of the link is prevented from influencing the normal operation of a message transmission function.
Correspondingly, the invention also provides a link detection device based on the network interface, which comprises a detection signal response module, a link abnormality determination module and a detection result output module;
the detection signal response module is used for responding to a link detection signal, detecting and obtaining a first time message count of a network interface to be detected corresponding to a link to be detected, detecting and obtaining a second time message count of the network interface to be detected according to a preset query period, and then determining whether the first time message count is smaller than the second time message count;
the link abnormality determining module is configured to determine that an abnormality occurs in the link to be detected corresponding to the network interface to be detected if the first time message count is greater than or equal to the second time message count, and send a first detection message to a target server so that the target server sends a first feedback message to the network interface to be detected;
and the detection result output module is used for detecting and obtaining a third time message count of the network interface to be detected after a preset time period, and determining the detection result of the link to be detected according to a second comparison result of the third time message count and the second time message count.
As a preferred example, after the determining that the first time packet count is greater than or equal to the second time packet count, the link anomaly determination module further includes:
performing bit adding operation on the numerical value of the first overtime data, and comparing the added first overtime data with a preset overtime threshold value to obtain a corresponding first comparison result; the first timeout data is used for calculating the times that the network interface to be detected does not receive the message;
if the first comparison result is that the first overtime data is larger than or equal to the overtime threshold, determining that the link to be detected corresponding to the network interface to be detected has a fault, triggering an alarm signal and executing a keep-alive mechanism on the link to be detected;
and if the first comparison result is that the first overtime data is smaller than the overtime threshold, determining that the link to be detected corresponding to the network interface to be detected is abnormal.
As a preferred example, after the determining that the link to be detected corresponding to the network interface to be detected is abnormal, the link abnormality determining module further includes:
sequencing all messages in a message database according to the termination active time to obtain a first message table; the message database records message information corresponding to a plurality of messages, wherein the message information comprises a sending serial number, a receiving serial number and a receiving window of each message;
Screening and matching are sequentially carried out in a connection tracking table according to the message information corresponding to each message in the first message table, and a server corresponding to TCP link information obtained by matching is determined to be the target server;
the connection tracking table is generated by integrating a plurality of pieces of TCP (transmission control protocol) link information, and the plurality of pieces of TCP link information are generated when the TCP link information is in data link with a plurality of servers through a TCP protocol.
As a preferred example, the link anomaly determination module sends a first detection message to a target server to enable the target server to send a first feedback message to the network interface to be detected, specifically:
according to the target server, corresponding TCP link information is called, the first detection message is constructed based on the TCP link information, and a destination address corresponding to the target server is determined;
and sending the first detection message to the target server according to the destination address so that the target server is triggered, and generating the first feedback message to be fed back to the network interface to be detected.
As a preferred example, the detection result output module determines a detection result of the link to be detected according to a second comparison result of the third time packet count and the second time packet count, specifically:
If the second comparison result is that the third time message count is larger than the second time message count, determining that the link to be detected is in a normal running state, resetting first timeout data and returning to detecting to obtain the first time message count of the network interface to be detected;
if the second comparison result is that the third time message count is smaller than or equal to the second time message count, determining that the link to be detected fails, triggering an alarm signal, executing a keep-alive mechanism on the link to be detected, and generating a failure analysis report and sending the failure analysis report to the first terminal.
Drawings
Fig. 1: a flow diagram of an embodiment of a network interface-based link detection method provided by the invention;
fig. 2: a schematic structural diagram of an embodiment of a link detection device based on a network interface provided by the invention;
fig. 3: the invention provides a networking topology diagram of one embodiment of a link detection device based on a network interface.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1, a flow chart of an embodiment of a link detection method based on a network interface provided by the present invention includes steps 101 to 103, where the steps are specifically as follows:
step 101: and responding to a link detection signal, detecting and obtaining a first time message count of a network interface to be detected corresponding to a link to be detected, detecting and obtaining a second time message count of the network interface to be detected according to a preset query period, and then determining whether the first time message count is smaller than the second time message count.
In response to a link detection signal, the link detection method provided by the embodiment of the invention firstly detects and determines the first time message count of the network interface to be detected corresponding to the link to be detected, namely, determines the initial message receiving number of each network interface to be detected, re-detects the message receiving data of each network interface to be detected according to a preset query period, then obtains the second time message count, compares the specific numerical values of the two data, and determines whether the first time message count, namely, the specific numerical value of the initial message receiving data is smaller than the second time message count. If the first time message count is determined to be smaller than the second time message count, the link to be detected is determined to be normal in operation without performing fault processing on the link to be detected, and if the first time message count is determined to be larger than or equal to the second time message count, the network interface to be detected is determined to be abnormal, and further detection is performed on the network interface to be detected to determine whether the corresponding link to be detected is faulty.
Since CPE devices act as intermediate devices in the network, it is often necessary to implement link detection as a function of network failure recovery. Therefore, in a network environment where the ping detection of the link cannot be performed, the CPE device generally provides the internet function for the down-link device, and the down-link device generally establishes a TCP connection with the server, so that the CPE device in this embodiment generates a link by multiplexing the TCP link connected to the down-link device with the server, and further detects the link based on the TCP protocol. Referring specifically to fig. 3, fig. 3 is a networking topology diagram of an embodiment of a link detection device based on a network interface according to the present invention. As shown in fig. 3, the down-hanging device is connected with the CPE device, and the down-hanging device is used as a TCP client and a server used as a TCP server and is linked with each other through a TCP protocol, so that the CPE device can link with the server through the TCP link information obtained by recording during link detection, thereby realizing the function of detecting the link.
In this embodiment, after responding to the link detection signal, the system will first initialize the CPE device, netfilter subsystem, and timeout counter timeout-count, and adjust the link timer to an on state. The timeout counter is used for recording the first timeout data, and the timeout counter is initialized to adjust timeout-count to 0; the link timer is used for recording the inquiry period and providing a specific time point for the system to detect the message receiving data aiming at the network interface to be detected.
After the initialization of the above devices is completed, the system will control the down-hanging device to perform TCP link with the server, and the corresponding generated TCP connection information will be subjected to NAT network address conversion by the CPE device, and at the same time, the netfilter subsystem will also start recording the TCP link information, and integrate the recorded TCP connection information into a connection tracking table, i.e. a Conntrack table (CT table), so that when each message information corresponding to the message flowing through the TCP link passes through the CPE device, the CPE device will record the corresponding message information, including the sending Sequence Number (Sequence Number), the receiving Sequence Number (response Sequence Number Acknowledgment Number) and the receiving window of each message, and store the above information into the message database for the subsequent system call.
After the above settings are completed, the system detects the received data of the first message for the network interface to be detected corresponding to the link to be detected, and then obtains the message count at the first moment. In this embodiment, the system records the message count, that is, the message received data, of the network interface currently required for link detection by the CPE device as recv-count1, as shown in fig. 3, where the network interface to be detected is a 5G-WAN, and the link to be detected is the 5G link in fig. 3.
In this embodiment, the preset query period is preferably 15 seconds to trigger a data detection, that is, the system queries the message receiving data of the network interface to be detected once through the CPE device every 15 seconds, counts the message receiving data obtained by the query, that is, the message of the network interface currently needing link detection, as recv-count2, and compares the specific values of recv-count1 and recv-count2, that is, determines whether the first time message count is smaller than the second time message count in this embodiment.
Step 102: if the first time message count is determined to be greater than or equal to the second time message count, determining that the link to be detected corresponding to the network interface to be detected is abnormal, and sending a first detection message to a target server so that the target server sends a first feedback message to the network interface to be detected.
If the first time message count is detected to be greater than or equal to the second time message count, the fact that the network interface to be detected corresponding to the link to be detected does not receive new messages in a preset query period is indicated that the message received by the link to be detected is abnormal, or a calculation error occurs in a detection algorithm for querying the message receiving number of the network interface to be detected, so that further barrier removal processing is needed to be carried out on the network interface to be detected. According to the link detection method provided by the embodiment of the invention, the target server is triggered to feed back the first feedback message to the network interface to be detected by sending the first detection message to the target server.
Exemplary, after determining that the first time packet count is greater than or equal to the second time packet count in this embodiment, the method further includes:
performing bit adding operation on the numerical value of the first overtime data, and comparing the added first overtime data with a preset overtime threshold value to obtain a corresponding first comparison result; the first timeout data is used for calculating the times that the network interface to be detected does not receive the message;
if the first comparison result is that the first overtime data is larger than or equal to the overtime threshold, determining that the link to be detected corresponding to the network interface to be detected has a fault, triggering an alarm signal and executing a keep-alive mechanism on the link to be detected;
and if the first comparison result is that the first overtime data is smaller than the overtime threshold, determining that the link to be detected corresponding to the network interface to be detected is abnormal.
In order to improve the accuracy of fault detection on a link, after determining that the first message data is greater than or equal to the second message data, the link detection method provided by the embodiment of the invention further performs a bit-to-one operation on the first timeout data, which indicates that the number of times that the network interface to be detected does not receive a message is increased by one, namely, the number of times that the network interface to be detected misses the message is increased by one, and compares the first timeout data after performing the addition operation with a timeout threshold preset in a system, so that whether the number of times that the link to be detected corresponding to the network interface to be detected does not receive the message reaches an alarm standard or not.
If the first overtime data is determined to be greater than or equal to the overtime threshold, the condition that the to-be-detected link corresponding to the to-be-detected network interface fails to the receiving function of the message is indicated, the alarm signal of the system is triggered, and a keep-alive mechanism is executed on the to-be-detected link, so that the failure detection efficiency and the keep-alive maintenance efficiency for the link are improved; if the first overtime data is smaller than the overtime threshold, the condition that the to-be-detected link corresponding to the to-be-detected network interface is abnormal and failure is not determined to occur is indicated, so that the link is further detected, and the accuracy and reliability of link failure detection are improved.
In this embodiment, after determining that recv-count1 is greater than or equal to recv-count2, the system further performs a 1-adding operation on the timeout counter timeout-count through the CPE device, and determines whether the specific value of the first timeout data, i.e., timeout-count, is greater than a timeout threshold, where the timeout threshold is preferably 5.
If the first timeout data is greater than or equal to the timeout threshold, namely timeout-count is greater than or equal to 5, a keep-alive mechanism is executed on the network interface of the link detection, and fault processing is carried out on the link to be detected, so that network communication is quickly restored.
If the first timeout data is less than the timeout threshold, namely timeout-count is less than 5, determining that the link to be detected is abnormal, and carrying out next detection on the link by the system.
Further, after determining that the to-be-detected link corresponding to the to-be-detected network interface is abnormal, the method further includes:
sequencing all messages in a message database according to the termination active time to obtain a first message table; the message database records message information corresponding to a plurality of messages, wherein the message information comprises a sending serial number, a receiving serial number and a receiving window of each message;
screening and matching are sequentially carried out in a connection tracking table according to the message information corresponding to each message in the first message table, and a server corresponding to TCP link information obtained by matching is determined to be the target server;
the connection tracking table is generated by integrating a plurality of pieces of TCP (transmission control protocol) link information, and the plurality of pieces of TCP link information are generated when the TCP link information is in data link with a plurality of servers through a TCP protocol.
After the system determines that the link to be detected corresponding to the network interface to be detected is abnormal, sequencing a plurality of messages in a message database according to the termination active time to obtain a first message table, determining the message range of the detected link abnormality, and carrying out matching screening on the message information of each message in the first message table obtained by integration and the message information of each message in the connection tracking table to determine the message of the first message table and the message of the server which are in data link with each other through a TCP protocol, thereby determining the target server and providing data support for further fault detection of the subsequent link to be detected.
After determining that an abnormal link exists, the link detection method provided by the embodiment of the invention firstly determines a first message table which is the approximate range of the abnormal link through the messages in the message database, then further determines the message which has TCP link with the server through the preset connection tracking table and the first message table, and determines the target server according to the TCP link information corresponding to the message, thereby realizing the triggering of the feedback message by the subsequent target server.
In this embodiment, after determining that the link to be detected is abnormal, the system may determine the target server by, in addition to first determining the first message table and then determining the target server according to the first message table and the continuous tracking table, the following method: firstly, a Conntrock table, namely a CT table, recorded by CPE equipment is obtained from a netfilter subsystem, then all TCP link information in an ESTABLISHED state in the CT table is obtained, network interfaces of which route outlets belong to link detection are screened out, namely network interfaces to be detected corresponding to links to be detected are determined, message information corresponding to the screened TCP link information is subjected to termination active time sequencing, and then servers of each TCP link in the table are determined to be target servers according to a sequencing table, and further link detection is carried out on each target server in the table.
Exemplary, in this embodiment, the sending a first detection message to a target server to enable the target server to send a first feedback message to the network interface to be detected specifically includes:
according to the target server, corresponding TCP link information is called, the first detection message is constructed based on the TCP link information, and a destination address corresponding to the target server is determined;
and sending the first detection message to the target server according to the destination address so that the target server is triggered, and generating the first feedback message to be fed back to the network interface to be detected.
After the target server is determined, the system invokes TCP link information corresponding to the target server, constructs a first detection message based on the TCP link information, and determines the IP address of the target server, namely the destination address. After the determination, the system sends the first detection message according to the determined destination address, so that the target server is triggered and executes a message feedback function, and feeds back the first feedback message to the network interface to be detected, thereby determining whether the link to be detected has a fault or not, and improving the accuracy and reliability of link detection.
In this embodiment, after determining a plurality of target servers and destination addresses corresponding to the target servers, the system traverses each target server, and performs link detection on each target server, that is, sends a corresponding detection message to each target server. The system in this embodiment constructs a corresponding first detection message based on the information of the TCP link corresponding to the TCP link between the target server and the hanging device, that is, the quintuple information. Wherein, the five-tuple information comprises a protocol number, a source IP address, a source port, a destination IP address and a destination port. The CT table may record protocols such as UDP or ICMP in addition to TCP protocol.
In the embodiment, the first detection message is preferably two detection messages, one is a SYN message constructed according to five-tuple information, and the first feedback message fed back by the target server is a challenge message according to RFC definition of TCP protocol; and secondly, constructing a first detection message according to the quintuple information, the sending sequence number, the receiving sequence number and the TCP window, namely, sending a message which is not acceptable by the TCP to the target server, wherein the first feedback message fed back by the target server is a DupAck message. In addition, the method and the device for searching books construct the first detection message, namely the message which is not acceptable by the TCP, not only comprise the two types, but also can be used for constructing other 'messages which are not acceptable by the TCP' and can meet the definition of RFC specifications, so that the message replied by the target server is triggered. Meanwhile, the embodiment can also construct a keep-alive sending message through the CPE equipment according to the recorded sending sequence number and the recorded receiving sequence number of the TCP link information, and further receive a response message of the target server to realize the detection of the link.
As a specific example, the CPE device obtains the TCP connection information of the ESTABLISHED state from the CT table as follows:
Conntrock-L2 > &1 grep ESTABLISHED destination IP address
The TCP connection information code is as follows:
Tcp6 7437 ESTABLISHED src=192.168.0.126 dst=157.148.69.74 sport=53972 dport=443 packets=4 bytes=740 src=157.148.69.74 dst=10.5.109.202 sport=443 dport=53972 packets=4 bytes=330 [ASSURED] mark=0 use=1
the five-tuple information is represented as follows:
original direction:
src=192.168.0.126 dst=157.148.69.74 sport=53972 dport=443
reply direction:
src=157.148.69.74 dst=10.5.109.202 sport=443 dport=53972
the CPE device will match the TCP link information in the Reply direction during link detection, and the TCP link information code is specifically expressed as follows:
hanging device 192.168.0.126:53972- > target server 157.148.69.74:443
After NAT network address conversion is performed by CPE:
hanging device 10.5.109.202:53972- > target server 157.148.69.74:443
Source IP:10.5.109.202, source port: 53972;
destination IP:157.148.69.74, destination port: 443.
step 103: and after a preset time period, detecting to obtain a third time message count of the network interface to be detected, and determining a detection result of the link to be detected according to a second comparison result of the third time message count and the second time message count.
After the system finishes sending the first detection message for a period of time, detecting the message receiving data of the network interface to be detected again to obtain a corresponding third time message count, comparing the third time message count with the second time message count, determining whether the network interface to be detected receives the first feedback message fed back by the target server or not, and determining the detection result of the link to be detected according to the comparison result of the first time message and the second time message count, namely determining whether the link to be detected has a fault or not. The link detection method provided by the invention realizes the detection of the link by sending the first detection message to the target server to trigger the server to feed back the first feedback message, and meanwhile, the detection of the link in a network environment which cannot perform ping detection is realized without presetting or manually configuring a detection address.
In this embodiment, the system determines whether a preset time period has elapsed according to the link detection timer, after determining that the preset time period has elapsed, the system performs detection of the third time message count recv-count3 on the network interface to be detected through the CPE device, and determines a detection result of the link to be detected according to a comparison result of the third time message count recv-count and the second time message count.
Exemplary, in this embodiment, the determining the detection result of the to-be-detected link according to the second comparison result of the third time packet count and the second time packet count specifically includes:
if the second comparison result is that the third time message count is larger than the second time message count, determining that the link to be detected is in a normal running state, resetting first timeout data and returning to detecting to obtain the first time message count of the network interface to be detected;
if the second comparison result is that the third time message count is smaller than or equal to the second time message count, determining that the link to be detected fails, triggering an alarm signal, executing a keep-alive mechanism on the link to be detected, and generating a failure analysis report and sending the failure analysis report to the first terminal.
In order to further improve efficiency and accuracy of fault detection on the link, the link detection method provided by the embodiment of the invention determines a detection result of the link to be detected according to the second comparison result after the second comparison result is obtained.
If the detection result is that the link to be detected is in a normal running state, the first overtime data can be reset to avoid that the data accumulation is not updated, so that the subsequent judgment on the link fault is affected, and the step of detecting the message count at the first moment is returned; if the detection result is that the link to be detected fails, an alarm signal of the system is triggered, a keep-alive mechanism is executed on the link to be detected, the barrier removing efficiency and the maintenance efficiency of the link to be detected are improved, meanwhile, a failure analysis report is generated and sent to a first terminal, namely a link maintainer, the working efficiency of the link maintainer is improved, and the long-term failure of the link is prevented from influencing the normal operation of a message transmission function.
The link detection method provided by the embodiment not only can be used for a 5G network communication scene, but also is suitable for a scene that network technologies such as 4G, WIFI and wires are connected by TCP.
In order to better illustrate the working principle and the step flow of the link detection method and the link detection device based on the network interface of the present invention, reference may be made to the above related description, but not limited thereto.
Accordingly, referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of a link detection device based on a network interface according to the present invention. As shown in fig. 2, the link detection apparatus includes a detection signal response module 201, a link abnormality determination module 202, and a detection result output module 203.
The detection signal response module 201 is configured to respond to a link detection signal, detect and obtain a first time packet count of a network interface to be detected corresponding to a link to be detected, detect and obtain a second time packet count of the network interface to be detected according to a preset query period, and then determine whether the first time packet count is smaller than the second time packet count.
The link anomaly determination module 202 is configured to determine that an anomaly occurs in the link to be detected corresponding to the network interface to be detected if the first time message count is greater than or equal to the second time message count, and send a first detection message to a target server so that the target server sends a first feedback message to the network interface to be detected.
Further, after the determining that the first time packet count is greater than or equal to the second time packet count, the link anomaly determination module 202 further includes:
Performing bit adding operation on the numerical value of the first overtime data, and comparing the added first overtime data with a preset overtime threshold value to obtain a corresponding first comparison result; the first timeout data is used for calculating the times that the network interface to be detected does not receive the message;
if the first comparison result is that the first overtime data is larger than or equal to the overtime threshold, determining that the link to be detected corresponding to the network interface to be detected has a fault, triggering an alarm signal and executing a keep-alive mechanism on the link to be detected; and if the first comparison result is that the first overtime data is smaller than the overtime threshold, determining that the link to be detected corresponding to the network interface to be detected is abnormal.
Further, after determining that the link to be detected corresponding to the network interface to be detected is abnormal, the link abnormality determining module 202 further includes:
sequencing all messages in a message database according to the termination active time to obtain a first message table; the message database records message information corresponding to a plurality of messages, wherein the message information comprises a sending serial number, a receiving serial number and a receiving window of each message; screening and matching are sequentially carried out in a connection tracking table according to the message information corresponding to each message in the first message table, and a server corresponding to TCP link information obtained by matching is determined to be the target server; the connection tracking table is generated by integrating a plurality of pieces of TCP (transmission control protocol) link information, and the plurality of pieces of TCP link information are generated when the TCP link information is in data link with a plurality of servers through a TCP protocol.
Further, the link anomaly determination module 202 sends a first detection message to a target server to enable the target server to send a first feedback message to the network interface to be detected, specifically:
according to the target server, corresponding TCP link information is called, the first detection message is constructed based on the TCP link information, and a destination address corresponding to the target server is determined; and sending the first detection message to the target server according to the destination address so that the target server is triggered, and generating the first feedback message to be fed back to the network interface to be detected.
The detection result output module 203 is configured to detect and obtain a third time packet count of the network interface to be detected after a preset period of time, and determine a detection result of the link to be detected according to a second comparison result of the third time packet count and the second time packet count.
Further, the detection result output module 203 determines a detection result of the to-be-detected link according to a second comparison result of the third time message count and the second time message count, specifically:
if the second comparison result is that the third time message count is larger than the second time message count, determining that the link to be detected is in a normal running state, resetting first timeout data and returning to detecting to obtain the first time message count of the network interface to be detected; if the second comparison result is that the third time message count is smaller than or equal to the second time message count, determining that the link to be detected fails, triggering an alarm signal, executing a keep-alive mechanism on the link to be detected, and generating a failure analysis report and sending the failure analysis report to the first terminal.
In summary, the embodiments of the present invention provide a method and an apparatus for detecting a link based on a network interface, in response to a link detection signal, first detect and obtain a first time packet count corresponding to a network interface to be detected of a link to be detected, and detect and obtain a second time packet count again according to a query period, so as to determine whether the first time packet count is smaller than the second time packet count; if the first feedback message is less than the first feedback message, determining that the link is abnormal, and then sending a first detection message to the target server so that the target server feeds back the first feedback message to the interface; and detecting the third time message count at the interface again by the system after feedback, and further determining the detection result of the link to be detected according to the comparison result of the third time message count and the second time message count. According to the embodiment of the invention, the first detection message is sent to the target server to trigger the server to feed back the first feedback message, so that the detection of the link is realized, the detection address is not required to be preset or configured manually, and meanwhile, the detection of the link in a network environment in which the ping detection cannot be performed is realized.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention, and are not to be construed as limiting the scope of the invention. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the spirit and principles of the present invention are intended to be included in the scope of the present invention.

Claims (8)

1. A method for detecting a link based on a network interface, comprising the steps of:
responding to a link detection signal, detecting and obtaining a first time message count of a network interface to be detected corresponding to a link to be detected, detecting and obtaining a second time message count of the network interface to be detected according to a preset query period, and then determining whether the first time message count is smaller than the second time message count;
if the first time message count is determined to be greater than or equal to the second time message count, determining that the link to be detected corresponding to the network interface to be detected is abnormal, and sequencing all messages in a message database according to the termination active time to obtain a first message table; the message database records message information corresponding to a plurality of messages, wherein the message information comprises a sending serial number, a receiving serial number and a receiving window of each message;
sequentially screening and matching in a connection tracking table according to the message information corresponding to each message in the first message table, determining a server corresponding to TCP link information obtained by matching as a target server, and sending a first detection message to the target server so that the target server sends a first feedback message to the network interface to be detected; the connection tracking table is generated by integrating a plurality of pieces of TCP (transmission control protocol) link information, and the plurality of pieces of TCP link information are generated when the TCP link information is in data link with a plurality of servers;
And after a preset time period, detecting to obtain a third time message count of the network interface to be detected, and determining a detection result of the link to be detected according to a second comparison result of the third time message count and the second time message count.
2. The network interface based link detection method according to claim 1, further comprising, after said determining that said first time message count is greater than or equal to said second time message count:
performing bit adding operation on the numerical value of the first overtime data, and comparing the added first overtime data with a preset overtime threshold value to obtain a corresponding first comparison result; the first timeout data is used for calculating the times that the network interface to be detected does not receive the message;
if the first comparison result is that the first overtime data is larger than or equal to the overtime threshold, determining that the link to be detected corresponding to the network interface to be detected has a fault, triggering an alarm signal and executing a keep-alive mechanism on the link to be detected;
and if the first comparison result is that the first overtime data is smaller than the overtime threshold, determining that the link to be detected corresponding to the network interface to be detected is abnormal.
3. The method for detecting a link based on a network interface according to claim 1, wherein the sending a first detection message to a target server to enable the target server to send a first feedback message to the network interface to be detected specifically includes:
according to the target server, corresponding TCP link information is called, the first detection message is constructed based on the TCP link information, and a destination address corresponding to the target server is determined;
and sending the first detection message to the target server according to the destination address so that the target server is triggered, and generating the first feedback message to be fed back to the network interface to be detected.
4. The method for detecting a link based on a network interface according to claim 1, wherein the determining the detection result of the link to be detected according to the second comparison result of the third time packet count and the second time packet count specifically includes:
if the second comparison result is that the third time message count is larger than the second time message count, determining that the link to be detected is in a normal running state, resetting first timeout data and returning to detecting to obtain the first time message count of the network interface to be detected;
If the second comparison result is that the third time message count is smaller than or equal to the second time message count, determining that the link to be detected fails, triggering an alarm signal, executing a keep-alive mechanism on the link to be detected, and generating a failure analysis report and sending the failure analysis report to the first terminal.
5. The link detection device based on the network interface is characterized by comprising a detection signal response module, a link abnormality determination module and a detection result output module;
the detection signal response module is used for responding to a link detection signal, detecting and obtaining a first time message count of a network interface to be detected corresponding to a link to be detected, detecting and obtaining a second time message count of the network interface to be detected according to a preset query period, and then determining whether the first time message count is smaller than the second time message count;
the link abnormality determining module is configured to determine that an abnormality occurs in the link to be detected corresponding to the network interface to be detected if the first time message count is greater than or equal to the second time message count, and order each message in the message database according to the termination active time to obtain a first message table; the message database records message information corresponding to a plurality of messages, wherein the message information comprises a sending serial number, a receiving serial number and a receiving window of each message; sequentially screening and matching in a connection tracking table according to the message information corresponding to each message in the first message table, determining a server corresponding to TCP link information obtained by matching as a target server, and sending a first detection message to the target server so that the target server sends a first feedback message to the network interface to be detected; the connection tracking table is generated by integrating a plurality of pieces of TCP (transmission control protocol) link information, and the plurality of pieces of TCP link information are generated when the TCP link information is in data link with a plurality of servers;
And the detection result output module is used for detecting and obtaining a third time message count of the network interface to be detected after a preset time period, and determining the detection result of the link to be detected according to a second comparison result of the third time message count and the second time message count.
6. The network interface based link detection apparatus of claim 5, wherein said link anomaly determination module, after said determining that said first time message count is greater than or equal to said second time message count, further comprises:
performing bit adding operation on the numerical value of the first overtime data, and comparing the added first overtime data with a preset overtime threshold value to obtain a corresponding first comparison result; the first timeout data is used for calculating the times that the network interface to be detected does not receive the message;
if the first comparison result is that the first overtime data is larger than or equal to the overtime threshold, determining that the link to be detected corresponding to the network interface to be detected has a fault, triggering an alarm signal and executing a keep-alive mechanism on the link to be detected;
and if the first comparison result is that the first overtime data is smaller than the overtime threshold, determining that the link to be detected corresponding to the network interface to be detected is abnormal.
7. The link detection apparatus based on network interface as claimed in claim 5, wherein the link anomaly determination module sends a first detection message to a target server to make the target server send a first feedback message to the network interface to be detected, specifically:
according to the target server, corresponding TCP link information is called, the first detection message is constructed based on the TCP link information, and a destination address corresponding to the target server is determined;
and sending the first detection message to the target server according to the destination address so that the target server is triggered, and generating the first feedback message to be fed back to the network interface to be detected.
8. The link detection device based on network interface as claimed in claim 5, wherein said detection result output module determines the detection result of the link to be detected according to the second comparison result of the third time message count and the second time message count, specifically:
if the second comparison result is that the third time message count is larger than the second time message count, determining that the link to be detected is in a normal running state, resetting first timeout data and returning to detecting to obtain the first time message count of the network interface to be detected;
If the second comparison result is that the third time message count is smaller than or equal to the second time message count, determining that the link to be detected fails, triggering an alarm signal, executing a keep-alive mechanism on the link to be detected, and generating a failure analysis report and sending the failure analysis report to the first terminal.
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