CN114629822B - Link detection method, device, electronic equipment and storage medium - Google Patents

Abstract

The present disclosure relates to a link detection method, device, electronic device and storage medium, and relates to the field of communication technology, and is applied to a router, wherein the router corresponds to one or more links, and the method comprises: sending a domain name system DNS request message to a domain name server corresponding to one or more target domain names through a target link to be detected, wherein the target link is any one of the one or more links. Monitoring the DNS response message sent by the domain name server according to the DNS request message. When the monitoring result of the DNS response message meets the preset abnormal condition, a link detection request message is sent to the target server. According to the response of the target server to the link detection request message, it is determined whether the target link is normal. The present disclosure can ensure the normal communication function of the link and improve the accuracy of link detection during the link detection process.

Description

Link detection method, device, electronic device and storage medium

Technical Field

The present disclosure relates to the field of communication technology, and in particular to a link detection method, device, electronic device and storage medium.

Background technique

Routers are commonly used home Internet access devices. With the development of bandwidth and technology, routers can not only use a single link to access the Internet, but also use multiple links to connect to the Internet, which doubles the bandwidth and brings users a more convenient and faster experience. At present, the link status is usually determined by sending ICMP (Internet Control Message Protocol) messages. However, if ICMP messages are sent for a long time and at a high frequency, the server may identify the router's actions as an "attack" behavior, and thus take actions such as non-response and denial of service, affecting normal network communication functions. In addition, when the detection result obtained by sending ICMP messages is normal, the link is not necessarily normal, so it may cause misjudgment and affect the accuracy of link detection.

Summary of the invention

In order to overcome the problems existing in the related art, the present disclosure provides a link detection method, device, electronic device and storage medium.

According to a first aspect of an embodiment of the present disclosure, a link detection method is provided, which is applied to a router, and the router corresponds to one or more links; the method includes:

Sending a domain name system DNS request message to a domain name server corresponding to one or more target domain names through a target link to be detected, wherein the target link is any link among the one or more links;

Monitoring the DNS response message sent by the domain name server according to the DNS request message;

When the monitoring result of the DNS response message meets the preset abnormal condition, sending a link detection request message to the target server;

Determine whether the target link is normal according to the response of the target server to the link detection request message.

Optionally, the one or more links include one link, and the preset abnormal condition includes:

After a first preset time period, the number of the DNS response messages received is less than or equal to a first preset number threshold; or,

The DNS response message is received within the first preset time period, and the number of abnormal response messages in the received DNS response message is greater than or equal to a second preset number threshold.

Optionally, the method further comprises:

When the DNS response message is received within the first preset time period and the number of normal response messages in the received DNS response message is greater than or equal to a third preset number threshold, it is determined that the target link is normal.

Optionally, the one or more links include multiple links, and the preset abnormal condition includes:

The DNS response message is received within a second preset time period, and the number of abnormal response messages in the received DNS response message is greater than or equal to a fourth preset number threshold.

Optionally, the method further comprises:

When the DNS response message is received within the second preset time period and the number of normal response messages in the DNS response message is greater than or equal to a fifth preset number threshold, determining that the target link is normal; or,

When the number of the DNS response messages received within the second preset time period is less than or equal to a sixth preset number threshold, it is determined that the target link is abnormal.

Optionally, the method further comprises:

In the case that the target link is abnormal, a normal link is determined from the multiple links, and the target traffic on the target link is transferred to the normal link, so that the target link stops data transmission.

Optionally, the method further comprises:

When the target link is switched from abnormal to normal, the target traffic on the normal link is transferred to the target link, so that the target link performs data transmission according to the target traffic.

Optionally, determining whether the target link is normal according to a response of the target server to the link detection request message includes:

In the case where a link detection response message sent by the target server according to the link detection request message is received within a third preset time period, determining that the target link is normal; or,

After the third preset time period is reached, if the link detection response message sent by the target server is not received, it is determined that the target link is abnormal.

According to a second aspect of an embodiment of the present disclosure, a link detection device is provided, which is applied to a router, and the router corresponds to one or more links; the device includes:

A first sending module is configured to send a domain name system DNS request message to a domain name server corresponding to one or more target domain names through a target link to be detected, wherein the target link is any link of the one or more links;

A monitoring module, configured to monitor a DNS response message sent by the domain name server according to the DNS request message;

A second sending module is configured to send a link detection request message to a target server when the monitoring result of the DNS response message meets a preset abnormal condition;

The first determination module is configured to determine whether the target link is normal according to the response of the target server to the link detection request message.

Optionally, the one or more links include one link, and the preset abnormal condition includes:

After a first preset time period, the number of the DNS response messages received is less than or equal to a first preset number threshold; or,

The DNS response message is received within the first preset time period, and the number of abnormal response messages in the received DNS response message is greater than or equal to a second preset number threshold.

Optionally, the device further comprises:

The second determination module is configured to determine that the target link is normal when the DNS response message is received within the first preset time period and the number of normal response messages in the received DNS response message is greater than or equal to a third preset number threshold.

Optionally, the one or more links include multiple links, and the preset abnormal condition includes:

The DNS response message is received within a second preset time period, and the number of abnormal response messages in the received DNS response message is greater than or equal to a fourth preset number threshold.

Optionally, the second determining module is further configured to:

When the DNS response message is received within the second preset time period and the number of normal response messages in the DNS response message is greater than or equal to a fifth preset number threshold, determining that the target link is normal; or,

When the number of the DNS response messages received within the second preset time period is less than or equal to a sixth preset number threshold, it is determined that the target link is abnormal.

Optionally, the device further comprises:

The transfer module is configured to determine a normal link from the multiple links when the target link is abnormal, and transfer the target traffic on the target link to the normal link, so that the target link stops transmitting data.

Optionally, the transfer module is further configured to:

When the target link is switched from abnormal to normal, the target traffic on the normal link is transferred to the target link, so that the target link performs data transmission according to the target traffic.

Optionally, the first determining module is configured to:

In the case where a link detection response message sent by the target server according to the link detection request message is received within a third preset time period, determining that the target link is normal; or,

After the third preset time period is reached, if the link detection response message sent by the target server is not received, it is determined that the target link is abnormal.

According to a third aspect of an embodiment of the present disclosure, an electronic device is provided, which is applied to a router, and the router corresponds to one or more links; the electronic device includes:

processor;

a memory for storing processor-executable instructions;

Wherein, the processor is configured to:

Sending a domain name system DNS request message to a domain name server corresponding to one or more target domain names through a target link to be detected, wherein the target link is any link among the one or more links;

Monitoring the DNS response message sent by the domain name server according to the DNS request message;

When the monitoring result of the DNS response message meets the preset abnormal condition, sending a link detection request message to the target server;

Determine whether the target link is normal according to the response of the target server to the link detection request message.

According to a fourth aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, on which computer program instructions are stored. When the program instructions are executed by a processor, the steps of the link detection method provided in the first aspect of the present disclosure are implemented.

The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

The present disclosure is applied to a router, and the router corresponds to one or more links. The method first sends a domain name system DNS request message to a domain name server corresponding to a target domain name through a target link to be detected, wherein the target link is any link of one or more links. Then, the DNS response message sent by the domain name server according to the DNS request message is monitored. When the monitoring result of the DNS response message meets the preset abnormal condition, a link detection request message is sent to the target server, and whether the target link is normal is determined based on the response of the target server to the link detection request message. The present disclosure first sends a DNS request message through a target link to be detected, and when the monitoring result of the DNS response message meets the preset abnormal condition, a link detection request message is sent to the target server, thereby determining whether the target link is normal. In the process of link detection, the normal communication function of the link can be guaranteed, and the accuracy of link detection can be improved.

It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

FIG1 is a flow chart of a link detection method according to an exemplary embodiment;

FIG2 is a flow chart showing another link detection method according to an exemplary embodiment;

FIG3 is a flow chart showing another link detection method according to an exemplary embodiment;

FIG4 is a flow chart showing another link detection method according to an exemplary embodiment;

FIG5 is a flow chart showing another link detection method according to an exemplary embodiment;

FIG6 is a flow chart showing another link detection method according to an exemplary embodiment;

FIG7 is a block diagram of a link detection device according to an exemplary embodiment;

FIG8 is a block diagram of another link detection device according to an exemplary embodiment;

FIG9 is a block diagram showing another link detection device according to an exemplary embodiment;

Fig. 10 is a block diagram of an electronic device according to an exemplary embodiment.

Detailed ways

Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

It should be noted that all actions of acquiring signals, information or data in this application are carried out in compliance with the relevant data protection laws and policies of the country where they are located and with the authorization given by the owner of the corresponding device.

Before introducing a link detection method, device, electronic device, and storage medium shown in the present disclosure, the application scenario of the present disclosure is first introduced.

The application scenario of the present disclosure can be the link detection process of a router. Due to the long-term and high-frequency sending of ICMP messages, the server may identify the action of the router as an "attack" behavior, and thus take actions such as non-response and denial of service, affecting the normal network communication function. In addition, in the case of an abnormal domain name server, even if the network is normal, users cannot use the network normally, for example, they cannot open common services such as web pages. Therefore, when the detection result obtained by sending ICMP messages is normal, the network is not necessarily normal, which may cause misjudgment and affect the accuracy of link detection.

FIG. 1 is a flow chart of a link detection method according to an exemplary embodiment. As shown in FIG. 1 , the method is used for a router, and the router corresponds to one or more links, and may include the following steps:

In step S101, a domain name system DNS (English: Domain Name System, Chinese: Domain Name System) request message is sent to a domain name server corresponding to one or more target domain names through a target link to be detected, and the target link is any link of the one or more links.

For example, the router may include one or more ports, and the port may be, for example, a WAN (English: Wide Area Network, Chinese: Wide Area Network) port, each port may correspond to a link, and each link may be connected to the network respectively. When the router corresponds to one link, each link may be repeatedly detected, and when the router corresponds to multiple links, all links of the router or multiple specified links may be periodically detected. First, one or more target domain names may be determined in a preset domain name list, and a DNS request message may be sent to a domain name server corresponding to one or more target domain names through a target link to be detected, wherein the target link is any link in the one or more links. If the target domain name is one, a DNS request message may be repeatedly sent to a domain name server corresponding to the target domain name. If the target domain name is multiple, a DNS request message may be sent to domain name servers corresponding to multiple target domain names in sequence, wherein the domain name server corresponding to each target domain name may be the same or different, that is, one domain name server corresponding to multiple target domain names may also correspond to multiple domain name servers, and the present disclosure does not specifically limit this.

In step S102, the DNS response message sent by the domain name server according to the DNS request message is monitored.

In step S103, when the monitoring result of the DNS response message meets the preset abnormal condition, a link detection request message is sent to the target server.

For example, after sending a DNS request message to the domain name server corresponding to each target domain name, the DNS response message sent by the domain name server according to the DNS request message can be monitored. Since the domain name server can generate a DNS response message according to the DNS protocol based on the DNS request message, it is possible to determine whether the target link is normal based on whether the DNS response message is normal. If the monitoring result of the DNS response message meets the preset abnormal condition, it means that the router cannot communicate normally with the domain name server through the target link, and the target link may be abnormal, then a link detection request message can be sent to the target server to detect the status of the target link again.

In the case where the router includes one link, the preset abnormal condition may be that after reaching a first preset time period, the number of DNS response messages received is less than or equal to a first preset number threshold. The preset abnormal condition may also be that a DNS response message is received within the first preset time period, and the number of abnormal response messages in the received DNS response message is greater than or equal to a second preset number threshold. The preset abnormal condition may also be a combination of the above two conditions, which is not specifically limited in the present disclosure. If the monitoring result of the DNS response message does not meet the preset abnormal condition, for example, a DNS response message is received within the first preset time period, and the number of normal response messages in the received DNS response message is greater than or equal to a third preset number threshold, then it can be determined that the target link is normal.

In the case where the router includes multiple links, the preset abnormal condition may be that a DNS response message is received within a second preset time period, and the number of abnormal response messages in the received DNS response message is greater than or equal to a fourth preset number threshold. If the monitoring result of the DNS response message does not meet the preset abnormal condition, for example, a DNS response message is received within the second preset time period, and the number of normal response messages in the DNS response message is greater than or equal to a fifth preset number threshold, then it is determined that the target link is normal. For another example, if the number of DNS response messages received within the second preset time period is less than or equal to a sixth preset number threshold, then it can be determined that the target link is abnormal.

In step S104, it is determined whether the target link is normal according to the response of the target server to the link detection request message.

For example, after sending a link detection request message to the target server, it can be determined whether the target link is normal based on the target server's response to the link detection request message. Specifically, if a link sent by the target server is received within a third preset time period, it means that the network between the router and the target server is unobstructed, then it can be determined that the target link is normal, wherein the link detection response message can be understood as a response message corresponding to the link detection request message. If a link detection response message is not received after reaching the third preset time period, it means that the network between the router and the target server is not accessible, then it can be determined that the target link is abnormal.

It should be noted that if a link detection response message is received by the target server in response to the link detection request message within the third preset time period, indicating that the network communication function of the target link is normal, then it can be determined that the domain name server corresponding to the target domain name is abnormal, resulting in the domain name server being unable to receive the DNS response message, or the received DNS response message is abnormal.

In this way, a DNS request message is first sent to the domain name server corresponding to the target domain name, and when the monitoring result of the DNS response message meets the preset abnormal condition, a link detection request message is sent to the target server to determine whether the target link is normal, which can avoid the problem of long-term and high-frequency sending of ICMP messages, resulting in server non-response and denial of service, so that the normal communication function of the link can be guaranteed during the link detection process. And by detecting the link in two detection methods, sending DNS request messages and sending ICMP messages, the accuracy of link detection can be improved.

In summary, the present disclosure is applied to a router, and the router corresponds to one or more links. The method first sends a domain name system DNS request message to a domain name server corresponding to a target domain name through a target link to be detected, wherein the target link is any link of one or more links. Then, the DNS response message sent by the domain name server according to the DNS request message is monitored. When the monitoring result of the DNS response message meets the preset abnormal condition, a link detection request message is sent to the target server, and based on the response of the target server to the link detection request message, it is determined whether the target link is normal. The present disclosure first sends a DNS request message through a target link to be detected, and when the monitoring result of the DNS response message meets the preset abnormal condition, a link detection request message is sent to the target server, thereby determining whether the target link is normal. In the process of link detection, the normal communication function of the link can be guaranteed, and the accuracy of link detection can be improved.

In an application scenario, the one or more links include a link, and the preset abnormal conditions include:

After the first preset time period has passed, the number of DNS response messages received is less than or equal to the first preset number threshold. Or,

A DNS response message is received within a first preset time period, and the number of abnormal response messages in the received DNS response message is greater than or equal to a second preset number threshold.

For example, the router may include a link, and if the number of DNS response messages received after reaching a first preset time period is less than or equal to a first preset number threshold, it can be determined that the preset abnormal condition is met. Taking the target domain name as 1 as an example, the first preset number threshold may be 1. After reaching the first preset time period, if no DNS response message is received, that is, the number of DNS response messages received is 0, it can be determined that the preset abnormal condition is met. If 1 DNS response message is received, it can be determined that the preset abnormal condition is not met. Taking the target domain name as 10 as an example, the first preset number threshold may be 8, for example. After reaching the first preset time period, if the number of DNS response messages received is less than or equal to 8, it can be determined that the preset abnormal condition is met. If the number of DNS response messages received is greater than 8, it can be determined that the preset abnormal condition is not met.

Alternatively, if a DNS response message is received within the first preset time period, and the number of abnormal response messages in the received DNS response message is greater than or equal to the second preset number threshold, then it can also be determined that the preset abnormal condition is met, wherein the abnormal response message can be understood as a DNS response message that does not comply with the DNS protocol. Taking the target domain name as 1 as an example, the second preset number threshold can be 1, and if 1 abnormal response message is received within the first preset time period, then it can be determined that the preset abnormal condition is met. If no abnormal response message is received within the first preset time period, that is, the number of abnormal response messages received is 0, then it can be determined that the preset abnormal condition is not met. Taking the target domain name as 20 as an example, the second preset number threshold can be 3, for example, after reaching the first preset time period, if the number of abnormal response messages received is greater than or equal to 3, then it can be determined that the preset abnormal condition is met, and if the number of abnormal response messages received is less than 3, then it can be determined that the preset abnormal condition is not met. For example, if 5 abnormal response messages are received, then it can be determined that the preset abnormal condition is met, and if 1 abnormal response message is received, then it can be determined that the preset abnormal condition is not met.

FIG. 2 is a flow chart showing another link detection method according to an exemplary embodiment. As shown in FIG. 2 , the method may further include:

In step S105, when a DNS response message is received within a first preset time period and the number of normal response messages in the received DNS response messages is greater than or equal to a third preset number threshold, it is determined that the target link is normal.

For example, in the case where the router includes one link, if a DNS response message is received within a first preset time period, and the number of normal response messages in the received DNS response message is greater than or equal to a third preset number threshold, then the target link can be determined to be normal, wherein a normal response message can be understood as a DNS response message that complies with the DNS protocol. Taking the target domain name as 1 as an example, the third preset number threshold can be 1, and 1 normal response message is received within the first preset time period, then the target link can be determined to be normal. Taking the target domain name as 20 as an example, the third preset number threshold can be 18, for example, and after reaching the first preset time period, if the number of normal response messages received is greater than or equal to 18, then the target link can be determined to be normal. For example, if 19 normal response messages are received, then the target link can be determined to be normal.

In another application scenario, the one or more links include multiple links, and the preset abnormal conditions include:

A DNS response message is received within a second preset time period, and the number of abnormal response messages in the received DNS response message is greater than or equal to a fourth preset number threshold.

For example, the router may include multiple links. In the case where the router includes multiple links, if a DNS response message is received within the second preset time period, and the number of abnormal response messages in the received DNS response message is greater than or equal to the fourth preset number threshold, then it can be determined that the preset abnormal condition is met. Taking the target domain name as 1 as an example, the second preset number threshold can be 1, and if 1 abnormal response message is received within the second preset time period, then it can be determined that the preset abnormal condition is met. If no abnormal response message is received within the second preset time period, then it can be determined that the preset abnormal condition is not met. Taking the target domain name as 15 as an example, the second preset number threshold can be 2, for example, after reaching the first preset time period, if the received abnormal response message is greater than or equal to 2, then it can be determined that the preset abnormal condition is met. If the received abnormal response message is less than 2, then it can be determined that the preset abnormal condition is not met. For example, if 3 abnormal response messages are received, then it can be determined that the preset abnormal condition is met. If 1 abnormal response message is received, then it can be determined that the preset abnormal condition is not met.

FIG. 3 is a flow chart of another link detection method according to an exemplary embodiment. As shown in FIG. 3 , the method may further include:

In step S106, if a DNS response message is received within the second preset time period and the number of normal response messages in the DNS response message is greater than or equal to the fifth preset number threshold, it is determined that the target link is normal.

In step S107, when the number of DNS response messages received within the second preset time period is less than or equal to a sixth preset number threshold, it is determined that the target link is abnormal.

For example, in the case where the router includes multiple links, if a DNS response message is received within the second preset time period, and the number of normal response messages in the DNS response message is greater than or equal to the fifth preset number threshold, then the target link is determined to be normal. Taking the target domain name as 1 as an example, the fifth preset number threshold can be 1, and 1 normal response message is received within the second preset time period, then the target link can be determined to be normal. Taking the target domain name as 18 as an example, the fifth preset number threshold can be 16, for example, after reaching the second preset time period, if the normal response message received is greater than or equal to 16, then the target link can be determined to be normal. For example, after reaching the second preset time period, if 17 normal response messages are received, then the target link can be determined to be normal.

If the number of DNS response messages received within the second preset time period is less than or equal to the sixth preset number threshold, it means that the target link cannot perform data transmission normally. Since the router includes multiple links, if one link cannot perform data transmission normally, it will cause network jamming or data loss. Therefore, the target link can be directly determined to be abnormal. Taking the target domain name as 1 as an example, the sixth preset number threshold can be 1. After reaching the second preset time period, if no DNS response message is received, then the target link can be determined to be abnormal. Taking the target domain name as 12 as an example, the sixth preset number threshold can be 10, for example. After reaching the second preset time period, if the number of DNS response messages received is less than or equal to 10, then the target link can be determined to be abnormal. For example, after reaching the second preset time period, if 8 normal response messages are received, then the target link can be determined to be abnormal.

FIG. 4 is a flow chart showing another link detection method according to an exemplary embodiment. As shown in FIG. 4 , the method may further include:

In step S108, when the target link is abnormal, a normal link is determined from multiple links, and the target traffic on the target link is transferred to the normal link, so that the target link stops data transmission.

For example, in the case where the router includes multiple links, if it is determined that the target link is abnormal, it means that the target link cannot perform data transmission. In the process of multi-link transmission, data loss may occur and affect the user's normal use of the network. Therefore, a normal link can be determined from multiple links, and the target traffic on the target link is transferred to the normal link, so that the target link stops performing data transmission, and other normal links of the router can transmit the data originally transmitted on the target link, ensuring that when the target link is abnormal, the user can still use the network normally, avoiding the situation of network jamming or data loss. The target traffic on the target link can be evenly distributed to multiple normal links. Taking the target traffic as W and the normal links as 3 as an example, W/3 of the traffic can be allocated to each normal link. The ratio allocated to each normal link can also be pre-specified, and the target traffic is allocated to each normal link according to the specified ratio. The present disclosure does not make specific limitations on this.

It should be noted that multiple links of the router can be periodically detected. In each detection cycle, all links can be detected in sequence, or a specified link can be detected. After determining that the target link is abnormal, the traffic on the target link can be immediately transferred to a normal link, wherein the normal link is a link with a normal detection result before the current moment. It is also possible that after each detection cycle ends, the traffic on the abnormal link detected in the current detection cycle can be transferred to a normal link, wherein the normal link is a link with a normal detection result in the current detection cycle. The present disclosure does not make specific limitations on this.

FIG. 5 is a flow chart of another link detection method according to an exemplary embodiment. As shown in FIG. 5 , the method may further include:

In step S109, when the target link is switched from abnormal to normal, the target traffic on the normal link is transferred to the target link, so that the target link performs data transmission according to the target traffic.

For example, when the target link is determined to be normal, the last detection result of the target link is obtained. If the last detection result of the target link is abnormal, indicating that the target link has switched from abnormal to normal, then the target traffic previously transferred to the normal link can be transferred back to the target link, so that the target link can transmit data according to the target traffic again. In this way, after the target link switches from abnormal to normal, the target traffic corresponding to the target link can be automatically transferred to the target link, so that the target link can automatically resume normal communication.

FIG. 6 is a flow chart showing another link detection method according to an exemplary embodiment. As shown in FIG. 6 , step 104 may be implemented by the following steps:

In step S1041, when a link detection response message sent by the target server according to the link detection request message is received within the third preset time period, it is determined that the target link is normal.

In step S1042, after the third preset time period is reached, if no link detection response message sent by the target server is received, it is determined that the target link is abnormal.

For example, after sending a link detection request message to the target server, it can be determined whether a link detection response message sent by the target server according to the link detection request message is received within a third preset time period. If a link detection response message is received within the third preset time period, it means that the network between the router and the target server is unobstructed, and then it can be determined that the target link is normal. If a link detection response message is not received after the third preset time period is reached, it means that the network between the router and the target server is not accessible, and then it can be determined that the target link is abnormal.

It should be noted that the target server is a pre-designated server, and the target server can be one or more. If there are multiple target servers, then the target link can be determined to be normal when the number of link detection response messages received within the third preset time period is greater than or equal to the seventh preset number threshold. And when the number of link detection response messages received within the third preset time period is less than the seventh preset number threshold, the target link is determined to be abnormal. Taking the number of target servers as 10 and the seventh preset number threshold as 8 as an example, if the number of link detection response messages received within the third preset time period is greater than or equal to 8, then the target link can be determined to be normal. If the number of link detection response messages received within the third preset time period is less than 8, then the target link can be determined to be abnormal.

In summary, the present disclosure is applied to a router, and the router corresponds to one or more links. The method first sends a domain name system DNS request message to a domain name server corresponding to a target domain name through a target link to be detected, wherein the target link is any link of one or more links. Then, the DNS response message sent by the domain name server according to the DNS request message is monitored. When the monitoring result of the DNS response message meets the preset abnormal condition, a link detection request message is sent to the target server, and based on the response of the target server to the link detection request message, it is determined whether the target link is normal. The present disclosure first sends a DNS request message through a target link to be detected, and when the monitoring result of the DNS response message meets the preset abnormal condition, a link detection request message is sent to the target server, thereby determining whether the target link is normal. In the process of link detection, the normal communication function of the link can be guaranteed, and the accuracy of link detection can be improved.

FIG7 is a block diagram of a link detection device according to an exemplary embodiment. As shown in FIG7 , the device is applied to a router, and the router corresponds to one or more links. The device 200 includes:

The first sending module 201 is configured to send a domain name system DNS request message to a domain name server corresponding to one or more target domain names through a target link to be detected, where the target link is any link of the one or more links.

The monitoring module 202 is configured to monitor the DNS response message sent by the domain name server according to the DNS request message.

The second sending module 203 is configured to send a link detection request message to the target server when the monitoring result of the DNS response message meets a preset abnormal condition.

The first determination module 204 is configured to determine whether the target link is normal according to the response of the target server to the link detection request message.

In an application scenario, the one or more links include a link, and the preset abnormal conditions include:

After the first preset time period has passed, the number of DNS response messages received is less than or equal to the first preset number threshold. Or,

A DNS response message is received within a first preset time period, and the number of abnormal response messages in the received DNS response message is greater than or equal to a second preset number threshold.

FIG8 is a block diagram of another link detection device according to an exemplary embodiment. As shown in FIG8 , the device 200 further includes:

The second determination module 205 is configured to determine that the target link is normal when a DNS response message is received within a first preset time period and the number of normal response messages in the received DNS response messages is greater than or equal to a third preset number threshold.

In another application scenario, the one or more links include multiple links, and the preset abnormal conditions include:

A DNS response message is received within a second preset time period, and the number of abnormal response messages in the received DNS response message is greater than or equal to a fourth preset number threshold.

In another application scenario, the second determining module 205 is further configured to:

If a DNS response message is received within the second preset time period, and the number of normal response messages in the DNS response message is greater than or equal to the fifth preset number threshold, it is determined that the target link is normal.

When the number of DNS response messages received within the second preset time period is less than or equal to a sixth preset number threshold, it is determined that the target link is abnormal.

FIG. 9 is a block diagram of another link detection device according to an exemplary embodiment. As shown in FIG. 9 , the device 200 further includes:

The transfer module 206 is configured to determine a normal link from multiple links when the target link is abnormal, and transfer the target traffic on the target link to the normal link, so that the target link stops transmitting data.

In another application scenario, the transfer module 206 is further configured to:

When the target link switches from abnormal to normal, the target traffic on the normal link is transferred to the target link, so that the target link transmits data according to the target traffic.

In another application scenario, the first determining module 204 is configured to:

When a link detection response message is received from the target server according to the link detection request message within the third preset time period, it is determined that the target link is normal.

After the third preset time period is reached, if no link detection response message sent by the target server is received, it is determined that the target link is abnormal.

Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

In summary, the present disclosure is applied to a router, and the router corresponds to one or more links. The method first sends a domain name system DNS request message to a domain name server corresponding to a target domain name through a target link to be detected, wherein the target link is any link of one or more links. Then, the DNS response message sent by the domain name server according to the DNS request message is monitored. When the monitoring result of the DNS response message meets the preset abnormal condition, a link detection request message is sent to the target server, and based on the response of the target server to the link detection request message, it is determined whether the target link is normal. The present disclosure first sends a DNS request message through a target link to be detected, and when the monitoring result of the DNS response message meets the preset abnormal condition, a link detection request message is sent to the target server, thereby determining whether the target link is normal. In the process of link detection, the normal communication function of the link can be guaranteed, and the accuracy of link detection can be improved.

The present disclosure also provides a computer-readable storage medium on which computer program instructions are stored. When the program instructions are executed by a processor, the steps of the link detection method provided by the present disclosure are implemented.

FIG10 is a block diagram of an electronic device 300 according to an exemplary embodiment. For example, the electronic device 300 may be provided as a server. Referring to FIG10 , the electronic device 300 includes a processing component 322, which further includes one or more processors, and a memory resource represented by a memory 332 for storing instructions executable by the processing component 322, such as an application. The application stored in the memory 332 may include one or more modules, each of which corresponds to a set of instructions. In addition, the processing component 322 is configured to execute instructions to perform the above-mentioned link detection method.

The electronic device 300 may further include a power supply component 326 configured to perform power management of the electronic device 300, a wired or wireless network interface 350 configured to connect the electronic device 300 to a network, and an input/output (I/O) interface 358. The electronic device 300 may operate based on an operating system stored in the memory 332, such as Windows Server ^TM , Mac OS X ^TM , Unix ^TM , Linux ^TM , FreeBSD ^TM or the like.

In another exemplary embodiment, a computer program product is further provided. The computer program product includes a computer program executable by a programmable device. The computer program has a code portion for executing the above link detection method when executed by the programmable device.

Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the present disclosure. This application is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and examples are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (9)

1. A link detection method, characterized in that it is applied to a router, and the router corresponds to one or more links; the method comprises: Sending a domain name system DNS request message to a domain name server corresponding to one or more target domain names through a target link to be detected, wherein the target link is any link among the one or more links; Monitoring the DNS response message sent by the domain name server according to the DNS request message; When the monitoring result of the DNS response message meets the preset abnormal condition, sending a link detection request message to the target server; Determining whether the target link is normal according to the response of the target server to the link detection request message; In the case where the one or more links include one link, the preset abnormal condition includes: After a first preset time period, the number of the DNS response messages received is less than or equal to a first preset number threshold; or, The DNS response message is received within the first preset time period, and the number of abnormal response messages in the received DNS response message is greater than or equal to a second preset number threshold; In the case where the one or more links include multiple links, the preset abnormal condition includes: The DNS response message is received within a second preset time period, and the number of abnormal response messages in the received DNS response message is greater than or equal to a fourth preset number threshold. 2. The method according to claim 1, characterized in that the method further comprises: When the DNS response message is received within the first preset time period and the number of normal response messages in the received DNS response message is greater than or equal to a third preset number threshold, it is determined that the target link is normal. 3. The method according to claim 1, characterized in that the method further comprises: When the DNS response message is received within the second preset time period and the number of normal response messages in the DNS response message is greater than or equal to a fifth preset number threshold, determining that the target link is normal; or, When the number of the DNS response messages received within the second preset time period is less than or equal to a sixth preset number threshold, it is determined that the target link is abnormal. 4. The method according to claim 1, characterized in that the method further comprises: In the case that the target link is abnormal, a normal link is determined from the multiple links, and the target traffic on the target link is transferred to the normal link, so that the target link stops data transmission. 5. The method according to claim 4, characterized in that the method further comprises: When the target link is switched from abnormal to normal, the target traffic on the normal link is transferred to the target link, so that the target link performs data transmission according to the target traffic. 6. The method according to any one of claims 1 to 5, characterized in that determining whether the target link is normal according to the response of the target server to the link detection request message comprises: In the case where a link detection response message sent by the target server according to the link detection request message is received within a third preset time period, determining that the target link is normal; or, After the third preset time period is reached, if the link detection response message sent by the target server is not received, it is determined that the target link is abnormal. 7. A link detection device, characterized in that it is applied to a router, and the router corresponds to one or more links; the device comprises: A first sending module is configured to send a domain name system DNS request message to a domain name server corresponding to one or more target domain names through a target link to be detected, wherein the target link is any link of the one or more links; A monitoring module, configured to monitor a DNS response message sent by the domain name server according to the DNS request message; A second sending module is configured to send a link detection request message to a target server when the monitoring result of the DNS response message meets a preset abnormal condition; A first determination module is configured to determine whether the target link is normal according to a response of the target server to the link detection request message; In the case where the one or more links include one link, the preset abnormal condition includes: After a first preset time period, the number of the DNS response messages received is less than or equal to a first preset number threshold; or, The DNS response message is received within the first preset time period, and the number of abnormal response messages in the received DNS response message is greater than or equal to a second preset number threshold; In the case where the one or more links include multiple links, the preset abnormal condition includes: The DNS response message is received within a second preset time period, and the number of abnormal response messages in the received DNS response message is greater than or equal to a fourth preset number threshold. 8. An electronic device, characterized in that it is applied to a router, and the router corresponds to one or more links; comprising: processor; a memory for storing processor-executable instructions; Wherein, the processor is configured to: Sending a domain name system DNS request message to a domain name server corresponding to one or more target domain names through a target link to be detected, wherein the target link is any link among the one or more links; Monitoring the DNS response message sent by the domain name server according to the DNS request message; When the monitoring result of the DNS response message meets the preset abnormal condition, sending a link detection request message to the target server; Determining whether the target link is normal according to the response of the target server to the link detection request message; In the case where the one or more links include one link, the preset abnormal condition includes: After a first preset time period, the number of the DNS response messages received is less than or equal to a first preset number threshold; or, The DNS response message is received within the first preset time period, and the number of abnormal response messages in the received DNS response message is greater than or equal to a second preset number threshold; In the case where the one or more links include multiple links, the preset abnormal condition includes: The DNS response message is received within a second preset time period, and the number of abnormal response messages in the received DNS response message is greater than or equal to a fourth preset number threshold. 9. A computer-readable storage medium having computer program instructions stored thereon, wherein the program instructions implement the steps of the method according to any one of claims 1 to 6 when executed by a processor.