CN117651006A - Link detection method and device - Google Patents
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Abstract
The invention discloses a link detection method and a device, comprising the following steps: setting a self-learning timer, and acquiring address information according to the self-learning Xi Dingshi device to perform link detection; counting the first message receiving quantity of the network interfaces of the links to be detected, and counting the second message receiving quantity of the network interfaces of the links to be detected according to the detection period of the self-learning Xi Dingshi device; adjusting a first counter of the self-learning Xi Dingshi device according to the first message receiving quantity and the second message receiving quantity; judging whether the link to be detected is abnormal or not according to the first counter, and performing fault processing on the abnormal link to be detected according to a link keep-alive mechanism. According to the invention, the address information of each server is automatically acquired according to the self-learning timer, so that the link detection is carried out according to the address information, the system is not required to preset the address information or manually configure the system, and the efficiency and the accuracy of the link detection are improved.
Description
Technical Field
The present invention relates to the field of network communications technologies, and in particular, to a link detection method and device.
Background
Network links refer to communication paths between connected network devices, which may be wired or wireless, such as optical fibers, network cables, radio waves, and the like. When a network link fails, data transmission is blocked or interrupted, so that problems such as website access delay, data loss and online service interruption are caused. In order to quickly resolve these failures, we need to perform link failure detection and analysis on the network links.
The existing network link fault analysis needs to preset a built-in system or manually configure a link detection destination address, and needs to configure different link detection addresses according to the field network topology under different network environments, so that the time consumption is long, and the detection efficiency and the detection accuracy are not high.
Disclosure of Invention
The invention provides a link detection method and a device, which are used for solving the technical problems that the prior link detection method needs to preset a system built-in or manually configure a link detection destination address, and has long time consumption and low efficiency and accuracy.
In order to solve the above technical problems, an embodiment of the present invention provides a link detection method, including:
setting a self-learning timer, and acquiring address information according to the self-learning Xi Dingshi device to perform link detection;
counting the first message receiving quantity of the network interfaces of the links to be detected, and counting the second message receiving quantity of the network interfaces of the links to be detected according to the detection period of the self-learning Xi Dingshi device;
adjusting a first counter of the self-learning Xi Dingshi device according to the first message receiving quantity and the second message receiving quantity;
judging whether the link to be detected is abnormal or not according to the first counter, and performing fault processing on the abnormal link to be detected according to a link keep-alive mechanism.
According to the invention, the address information of each server is automatically acquired according to the self-learning timer, so that the link detection is carried out according to the address information, the system is not required to preset the address information or manually configure the system, and the efficiency and the accuracy of the link detection are improved.
Further, the setting of the self-learning timer, and obtaining address information according to the self-learning Xi Dingshi device, performs link detection, specifically includes:
initializing a system, setting a self-learning timer according to a preset period, and resetting a first counter of the self-learning Xi Dingshi device;
and obtaining address information according to the preset period of the self-learning Xi Dingshi device to perform link detection.
Further, the link detection is performed by acquiring address information according to a preset period of the self-learning Xi Dingshi device, specifically:
acquiring a connection tracking table, and screening an address information set according to the connection tracking table and a preset first condition, wherein the address information set comprises first address information, second address information and third address information;
and screening out the first connection information according to the connection tracking table and a preset second condition.
Further, the filtering the address information set according to the connection tracking table and the preset condition specifically includes:
acquiring I CMP address information of which the route outlet belongs to a network interface of link detection and is in a response state according to the connection tracking table; sorting the I CMP address information according to the active time, and screening out a plurality of I CMP address information as first address information;
acquiring DNS address information in a connection tracking table according to the first condition; sorting the DNS address information according to the active time, and screening out a plurality of DNS address information as second address information;
acquiring ntp address information in a connection tracking table according to the first condition, sequencing the ntp address information according to the active time, and screening out a plurality of ntp address information as third address information;
the first condition specifies that a routing exit of the address information belongs to a network interface of link detection and that the address information is in a reply state.
Further, the first connection information is screened out according to the connection tracking table and a preset second condition, specifically:
acquiring TCP connection information of all network interfaces which are in a successful connection state and the route outlet belongs to link detection according to the connection tracking table;
and sequencing the TCP connection information according to the active time, and screening out a plurality of TCP connection information as first connection information.
Further, the adjusting the first counter of the self-learning Xi Dingshi device according to the first message receiving number and the second message receiving number specifically includes:
and if the second message receiving quantity is larger than the first message receiving quantity, resetting the first counter.
Further, the determining, according to the first counter, whether the link to be detected is abnormal or not, and performing fault processing on the abnormal link to be detected according to a link keep-alive mechanism, specifically includes:
acquiring a count value of the first counter, and judging whether the count value exceeds a preset threshold;
if the count value exceeds a preset threshold, performing fault processing on the abnormal link to be detected according to a link keep-alive mechanism;
and if the count value does not exceed the preset threshold value, detecting the connection state of each server.
Further, the detecting the connection state of each server specifically includes:
detecting whether the target address in the first address information is successfully connected, and resetting the first counter if the target address is successfully connected;
otherwise, detecting whether the domain name interpretation of the network interface to the server in the second address information is successful, and resetting the first counter if the domain name interpretation is successful;
otherwise, detecting whether the time for the network interface to acquire the third address information from the server is successful, and resetting the first counter if the time is successful;
otherwise, sending a message to the server according to the port information in the first connection information, detecting whether the receiving is successful, and resetting the first counter if the receiving is successful.
In a second aspect, the present invention provides a link detection apparatus, including: the system comprises a timing module, a message statistics module, a counting module and a detection module;
the timing module is used for setting a self-learning timer and carrying out link detection according to the self-learning Xi Dingshi device;
the message statistics module is used for counting the first message receiving quantity of the network interfaces of the link to be detected, and counting the second message receiving quantity of the network interfaces of the link to be detected according to the detection period of the self-learning Xi Dingshi device;
the counting module is used for adjusting a first counter of the self-learning Xi Dingshi device according to the first message receiving quantity and the second message receiving quantity;
the detection module is used for judging whether the link to be detected is abnormal according to the first counter, and performing fault processing on the abnormal link to be detected according to a link keep-alive mechanism.
In a third aspect, the present invention provides a computer device comprising: one or more processors; a memory coupled to the processor for storing one or more programs;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the link detection method.
Drawings
Fig. 1 is a schematic flow chart of a link detection method according to an embodiment of the present invention;
fig. 2 is another flow chart of a link detection method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a link detection device according to an embodiment of the present invention.
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, fig. 1 is a flow chart of a link detection method according to an embodiment of the present invention, including steps 101 to 104, specifically as follows:
step 101: setting a self-learning timer, and acquiring address information according to the self-learning Xi Dingshi device to perform link detection;
in this embodiment, the link detection method performs link detection and fault repair in CPE (Customer Premise Equipment, wireless access terminal) equipment.
In this embodiment, the CPE device is a network device that provides the network function for the on-hook device, and the CPE device typically needs to perform NAT network address translation for the on-hook device to connect to the server.
In this embodiment, the services used by the hanging device include: the down-hanging device is connected to the NTP server for time synchronization, the down-hanging device is connected to the DNS server for domain name interpretation, the down-hanging device detects the destination IP connectivity by using ping, and the down-hanging device initiates connection to the server for related service by using TCP. Thus, under different network environments, the CPE device may automatically learn destination address information of ping/dns/ntp/tcp for link detection based on network behavior of the hanging device connecting to a common server.
In this embodiment, the setting a self-learning timer and performing link detection according to the address information acquired by the self-learning Xi Dingshi device specifically includes:
initializing a system, setting a self-learning timer according to a preset period, and resetting a first counter of the self-learning Xi Dingshi device;
and obtaining address information according to the preset period of the self-learning Xi Dingshi device to perform link detection.
In this embodiment, the routing system of the CPE device is initialized, the netfilter subsystem is initialized, the self-learning Xi Dingshi device is started, the link detection timer is started, and the first counter timeout-count is initialized to 0.
In this embodiment, the self-learning sub-timer is periodically triggered according to a preset period.
In this embodiment, the link detection is performed by acquiring address information according to a preset period of the self-learning Xi Dingshi device, specifically:
acquiring a connection tracking table, and screening an address information set according to the connection tracking table and a preset first condition, wherein the address information set comprises first address information, second address information and third address information;
and screening out the first connection information according to the connection tracking table and a preset second condition.
In this embodiment, the filtering the address information set according to the connection tracking table and the preset condition specifically includes:
acquiring ICMP address information of which the route outlet belongs to a network interface of link detection and is in a response state according to the connection tracking table; sorting the ICMP address information according to the active time, and screening a plurality of ICMP address information as first address information;
acquiring DNS address information in a connection tracking table according to the first condition; sorting the DNS address information according to the active time, and screening out a plurality of DNS address information as second address information;
acquiring ntp address information in a connection tracking table according to the first condition, sequencing the ntp address information according to the active time, and screening out a plurality of ntp address information as third address information;
the first condition specifies that a routing exit of the address information belongs to a network interface of link detection and that the address information is in a reply state.
In this embodiment, a Conntrack table recorded by the system, namely, a connection tracking table, is obtained from a netfilter, all the ICMP address information in response is obtained according to the tracking connection table, only network interfaces of which the route exits belong to link detection are matched, the ICMP address information is ordered based on the last active moment, and a preset N records are reserved as ICMP-tables, namely, first address information.
In this embodiment, all DNS address information in response is obtained from the connrack table, only the network interfaces of which the route exits belong to link detection are matched, the DNS address information is ordered based on the last active time, and the preset N records are reserved as DNS-tables, that is, the second address information. Wherein typically DNS defaults to 53 ports of udp.
In this embodiment, all the ntp address information in response is obtained from the Conntrack table, only the network interfaces of which the route exits belong to the link detection are matched, the ntp address information is ordered based on the last active time, and the preset N records are reserved as ntp-tables, namely third address information. Where (typically NTP defaults to 123 ports of udp.
In this embodiment, the first connection information is screened out according to the connection tracking table and a preset second condition, which specifically is:
acquiring TCP connection information of all network interfaces which are in a successful connection state and the route outlet belongs to link detection according to the connection tracking table;
and sequencing the TCP connection information according to the active time, and screening out a plurality of TCP connection information as first connection information.
In this embodiment, all TCP connection information in the ESTABLISHED state is obtained from the Conntrack table, only the network interfaces of which the route outlets belong to the link detection are matched, the TCP connection information is ordered based on the last active time, and the preset N records are reserved as TCP-tables, i.e. the first connection information.
Step 102: counting the first message receiving quantity of the network interfaces of the links to be detected, and counting the second message receiving quantity of the network interfaces of the links to be detected according to the detection period of the self-learning Xi Dingshi device;
in this embodiment, the CPE device records the received packet count of the network interface of the link to be detected as recv-count1, i.e. the first packet reception number.
In this embodiment, the CPE device determines whether it has reached the cycle time of its own timer according to a preset cycle, which is set to trigger every 15 seconds by default. When the period time of the preset period is reached after the first message receiving number is obtained, the CPE equipment records that the message count of the network interface of the link to be detected is recv-count2, namely the second message receiving number.
Step 103: adjusting a first counter of the self-learning Xi Dingshi device according to the first message receiving quantity and the second message receiving quantity;
in this embodiment, whether recv-count2 is greater than recv-count1 is determined, and if so, the first counter is reset; otherwise, the first timer timeout-count of the CPE device is increased by 1, and whether the count value of the first counter exceeds a preset threshold value is judged. Wherein the threshold is set to 5.
Step 104: judging whether the link to be detected is abnormal or not according to the first counter, and performing fault processing on the abnormal link to be detected according to a link keep-alive mechanism.
In this embodiment, in a certain period of time, the message receiving counter of the network interface is not increased, the trigger link detection counter is increased by one, and the link detection is started to be attempted by using multiple modes such as ping/ntp/dns/tcp, and if the trigger link detection count value reaches a certain number of times, the message receiving counter of the network interface is not increased all the time, and then the link is considered to be abnormal.
In this embodiment, the determining, according to the first counter, whether the link to be detected has an abnormality, and performing fault processing on the abnormal link to be detected according to a link keep-alive mechanism, specifically includes:
acquiring a count value of the first counter, and judging whether the count value exceeds a preset threshold;
if the count value exceeds a preset threshold, performing fault processing on the abnormal link to be detected according to a link keep-alive mechanism;
and if the count value does not exceed the preset threshold value, detecting the connection state of each server.
In this embodiment, the detecting the connection state of each server specifically includes:
detecting whether the target address in the first address information is successfully connected, and resetting the first counter if the target address is successfully connected;
otherwise, detecting whether the domain name interpretation of the network interface to the server in the second address information is successful, and resetting the first counter if the domain name interpretation is successful;
otherwise, detecting whether the time for the network interface to acquire the third address information from the server is successful, and resetting the first counter if the time is successful;
otherwise, sending a message to the server according to the port information in the first connection information, detecting whether the receiving is successful, and resetting the first counter if the receiving is successful.
In this embodiment, if the first counter is greater than a preset threshold, the CPE device acquires the icmp address information from the icmp-table, uses a ping tool to specify whether the specific network interface detects the destination address successfully, resets the first counter if the ping is successful, and performs link detection in the next period.
In this embodiment, if the ping connection fails, the CPE device obtains the dns server address information from the dns-table, specifies, using the dns tool, whether the specific network interface interprets the domain name to the server successfully, resets the first counter if the domain name interpretation is successful, and performs link detection in the next period.
In this embodiment, if the domain name interpretation fails, the CPE device acquires the ntp server address information from the ntp-table, specifies whether the acquisition time of the specific network interface to the server is successful using the ntp tool, resets the first counter if the acquisition time is successful, and performs link detection in the next period.
In this embodiment, if the acquisition time fails, the CPE device acquires tcp server address port information from the tcp-table, constructs a SYN message to specify that a specific network interface is sent to the server, receives whether SYN-ACK is successful, resets the first counter if the reception is successful, and performs link detection in the next period. And if the receiving fails, reckoning the received message count of the link interface to be detected.
In this embodiment, the CPE device uses a TCP port to construct a SYN message (a first handshake message of the TCP) and sends the SYN message to the server, the CPE device receives a SYN-ACK message of the server (a second handshake message of the TCP), the CPE device indicates that the link is normal when receiving the SYN-ACK message, and when the standard TCP establishes a connection, the CPE device needs to send an ACK message (a third handshake message), and then the CPE device will not respond to the ACK message, but falsify that the CPE device does not receive the SYN-ACK message and let the server continue to retransmit the SYN-ACK message to the CPE device.
In this embodiment, when the link is detected by using the TCP method, the CPE device will periodically send a SYN message unless the CPE device stops detecting the link by using the TCP method, and the CPE device will respond to the RST message to the server when receiving the SYN-ACK, so as to release the TCP semi-connection resource. Therefore, the server always sends SYN-ACK message, and the CPE device adopts a mode that the server always retransmits SYN-ACK without responding to the third handshake of the TCP to detect the link, which is different from the fact that the downlink device and the TCP server really establish the third handshake to carry out TCP service.
In this embodiment, when the link keep-alive mechanism resumes the network, different link keep-alive is performed according to different interfaces, for example, the 5G network interface performs link detection, and if the link abnormality is detected, the keep-alive mechanism may be dial up by re-resident network. Link detection is performed on a WiFi network interface, and if the link abnormality is detected, a keep-alive mechanism may be to control WiFi drive reset, control power supply, and the like.
Referring to fig. 2, fig. 2 is a schematic flow chart of a link detection method according to an embodiment of the invention.
In this embodiment, the CPE device autonomously learns the destination address information of ping/dns/ntp for link detection based on the network behavior of the hanging device connecting to the common server, and the CPE device autonomously learns the TCP port opened by the TCP server for link detection. Meanwhile, the method that the SYN message is always sent and the server always retransmits the SYN-ACK is not responded to the third handshake of the TCP is used for realizing link detection, one aspect does not affect the application layer function of the TCP server (the TCP does not really establish connection), and the other aspect does not enable the TCP server to generate more TCP semi-connections to consume system resources.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a link detection device according to an embodiment of the present invention, including: a timing module 301, a message statistics module 302, a counting module 303 and a detection module 304;
the timing module 301 is configured to set a self-learning timer, and perform link detection according to the self-learning Xi Dingshi device;
the message statistics module 302 is configured to count a first number of received messages of a network interface of a link to be detected, and count a second number of received messages of the network interface of the link to be detected according to a detection period of the self-learning Xi Dingshi device;
the counting module 303 is configured to adjust a first counter of the self-learning Xi Dingshi device according to the first message receiving number and the second message receiving number;
the detection module 304 is configured to determine whether the link to be detected is abnormal according to the first counter, and perform fault processing on the abnormal link to be detected according to a link keep-alive mechanism.
The embodiment of the invention also provides computer equipment, which comprises: one or more processors; a memory coupled to the processor for storing one or more programs;
the one or more programs, when executed by the one or more processors, cause the one or more processors to perform the link detection method.
In this embodiment, the CPE device serves as an intermediate device of the network to provide a network function for the down-hanging device, and when icmp, dns, ntp used by the down-hanging device requests a corresponding server for a related service, the CPE device may automatically learn a corresponding icmp, dns, ntp destination address, and the CPE device will be used for link detection; meanwhile, when the down-hanging device is connected to the destination IP and the port of the server by using TCP, the CPE device can learn the IP address and the TCP port for link detection, and the detection of the destination address does not need to be preset in a system or manually configured.
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 (10)
1. A method of link detection, comprising:
setting a self-learning timer, and acquiring address information according to the self-learning Xi Dingshi device to perform link detection;
counting the first message receiving quantity of the network interfaces of the links to be detected, and counting the second message receiving quantity of the network interfaces of the links to be detected according to the detection period of the self-learning Xi Dingshi device;
adjusting a first counter of the self-learning Xi Dingshi device according to the first message receiving quantity and the second message receiving quantity;
judging whether the link to be detected is abnormal or not according to the first counter, and performing fault processing on the abnormal link to be detected according to a link keep-alive mechanism.
2. The link detection method according to claim 1, wherein the setting of the self-learning timer and the obtaining of the address information according to the self-learning Xi Dingshi device perform the link detection specifically comprises:
initializing a system, setting a self-learning timer according to a preset period, and resetting a first counter of the self-learning Xi Dingshi device;
and obtaining address information according to the preset period of the self-learning Xi Dingshi device to perform link detection.
3. The link detection method as claimed in claim 2, wherein the link detection is performed by acquiring address information according to a preset period of the self-learning Xi Dingshi device, specifically:
acquiring a connection tracking table, and screening an address information set according to the connection tracking table and a preset first condition, wherein the address information set comprises first address information, second address information and third address information;
and screening out the first connection information according to the connection tracking table and a preset second condition.
4. The link detection method according to claim 3, wherein the screening of the address information set according to the connection tracking table and the preset condition specifically includes:
acquiring ICMP address information of which the route outlet belongs to a network interface of link detection and is in a response state according to the connection tracking table; sorting the ICMP address information according to the active time, and screening a plurality of ICMP address information as first address information;
acquiring DNS address information in a connection tracking table according to the first condition; sorting the DNS address information according to the active time, and screening out a plurality of DNS address information as second address information;
acquiring ntp address information in a connection tracking table according to the first condition, sequencing the ntp address information according to the active time, and screening out a plurality of ntp address information as third address information;
the first condition specifies that a routing exit of the address information belongs to a network interface of link detection and that the address information is in a reply state.
5. The link detection method according to claim 3, wherein the first connection information is screened out according to the connection tracking table and a preset second condition, specifically:
acquiring TCP connection information of all network interfaces which are in a successful connection state and the route outlet belongs to link detection according to the connection tracking table;
and sequencing the TCP connection information according to the active time, and screening out a plurality of TCP connection information as first connection information.
6. The link detection method according to claim 5, wherein the adjusting the first counter of the self-learning Xi Dingshi device according to the first message receiving number and the second message receiving number specifically includes:
and if the second message receiving quantity is larger than the first message receiving quantity, resetting the first counter.
7. The link detection method according to claim 6, wherein the determining whether the link to be detected is abnormal according to the first counter, and performing fault processing on the abnormal link to be detected according to a link keep-alive mechanism, specifically includes:
acquiring a count value of the first counter, and judging whether the count value exceeds a preset threshold;
if the count value exceeds a preset threshold, performing fault processing on the abnormal link to be detected according to a link keep-alive mechanism;
and if the count value does not exceed the preset threshold value, detecting the connection state of each server.
8. The link detection method according to claim 7, wherein the detecting the connection state of each server specifically includes:
detecting whether the target address in the first address information is successfully connected, and resetting the first counter if the target address is successfully connected;
otherwise, detecting whether the domain name interpretation of the network interface to the server in the second address information is successful, and resetting the first counter if the domain name interpretation is successful;
otherwise, detecting whether the time for the network interface to acquire the third address information from the server is successful, and resetting the first counter if the time is successful;
otherwise, sending a message to the server according to the port information in the first connection information, detecting whether the receiving is successful, and resetting the first counter if the receiving is successful.
9. A link detection apparatus, comprising: the system comprises a timing module, a message statistics module, a counting module and a detection module;
the timing module is used for setting a self-learning timer and carrying out link detection according to the self-learning Xi Dingshi device;
the message statistics module is used for counting the first message receiving quantity of the network interfaces of the link to be detected, and counting the second message receiving quantity of the network interfaces of the link to be detected according to the detection period of the self-learning Xi Dingshi device;
the counting module is used for adjusting a first counter of the self-learning Xi Dingshi device according to the first message receiving quantity and the second message receiving quantity;
the detection module is used for judging whether the link to be detected is abnormal according to the first counter, and performing fault processing on the abnormal link to be detected according to a link keep-alive mechanism.
10. A computer device, comprising: one or more processors; a memory coupled to the processor for storing one or more programs;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the link detection method of any of claims 1-8.
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