CN107968845B - DHCP server state detection method and device and DHCP relay - Google Patents

DHCP server state detection method and device and DHCP relay Download PDF

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CN107968845B
CN107968845B CN201610912022.4A CN201610912022A CN107968845B CN 107968845 B CN107968845 B CN 107968845B CN 201610912022 A CN201610912022 A CN 201610912022A CN 107968845 B CN107968845 B CN 107968845B
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dhcp
request message
state
tested
server
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CN107968845A (en
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薛晗
苏清
于峰
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/50—Address allocation
    • H04L61/5007—Internet protocol [IP] addresses
    • H04L61/5014—Internet protocol [IP] addresses using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
    • 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

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Environmental & Geological Engineering (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The invention provides a method and a device for detecting the state of a DHCP server and a DHCP relay, which solve the problem that the existing DHCP relay is easy to misjudge when judging the active state of the DHCP server. The detection method comprises the following steps: acquiring parameter information required by a DHCP server to be tested to respond to a DHCP request message; generating a DHCP request message carrying parameter information, and sending the DHCP request message to a DHCP server to be tested; and waiting for receiving a response message returned by the DHCP server to be tested according to the DHCP request message, and determining whether the state of the DHCP server to be tested is an available state or not according to whether the response message is received or not. The invention detects the active state of the DHCP server by sending the DHCP request message meeting the requirements of the DHCP server to be detected through the DHCP relay, thereby improving the accuracy of the DHCP relay for detecting the state of the DHCP server.

Description

DHCP server state detection method and device and DHCP relay
Technical Field
The present invention relates to the field of communications application technologies, and in particular, to a method and an apparatus for detecting a DHCP server status, and a DHCP relay.
Background
A Dynamic Host Configuration Protocol (DHCP) is a network Configuration Protocol generated by optimizing and expanding based on a Bootstrap Protocol (BOOTP Protocol). With the continuous development of mobile internet, DHCP is widely used in services such as Internet Protocol Television (IPTV), Next Generation Network (NGN), 3G, and 4G. In a mobile network deployed by an operator, for convenience of centralized management and cost saving, a centralized address management mode and a distributed relay management mode are generally adopted. When the DHCP client and the DHCP server are not in the same physical network segment, the broadcast request message sent by the DHCP client cannot cross the subnet and reach the DHCP server, and the DHCP relay in the same network with the DHCP client forwards the request message of the client to the DHCP server. After receiving the response message of the DHCP server, the DHCP relay forwards the message to the DHCP client, and the DHCP client obtains the IP address and other option information according to the message.
The detection of the DHCP relay on the active state of the DHCP server in the network has important significance in the aspects of network disaster tolerance and fault diagnosis. At present, some network devices having a DHCP relay function detect and determine an active state of a DHCP server according to whether the DHCP server has a response after forwarding a request message of a DHCP client. The problems with this implementation are: some DHCP servers respond to the DHCP request message which meets the condition, and for some requests which do not meet the requirements of the server, if some option information in the server check request message do not meet the requirements, the request message is silently discarded. The DHCP relay does not receive the response message of the server, and the state of the DHCP server is judged to be unavailable by mistake.
Disclosure of Invention
The invention aims to provide a method and a device for detecting the state of a DHCP server and a DHCP relay, which are used for solving the problem that the existing DHCP relay is easy to misjudge when judging the active state of the DHCP server.
In order to achieve the above object, the present invention provides a method for detecting a state of a DHCP server, which is applied to a DHCP relay and includes:
acquiring parameter information required by a DHCP server to be tested to respond to a DHCP request message;
generating a DHCP request message carrying the parameter information, and sending the DHCP request message to the DHCP server to be tested;
waiting for receiving a response message returned by the DHCP server to be tested according to the DHCP request message, and determining whether the state of the DHCP server to be tested is an available state according to whether the response message is received or not.
Wherein, generating the DHCP request packet carrying the parameter information includes:
and adding the parameter information into the option information of the DHCP message to obtain a DHCP request message carrying the parameter information.
Wherein, determining whether the state of the DHCP server to be tested is an available state according to whether the response message is received comprises:
and if the response message is received within the first preset time of sending the DHCP request message, determining that the state of the DHCP server to be tested is an available state.
Wherein, determining whether the state of the DHCP server to be tested is an available state according to whether the response message is received comprises:
if the response message is not received within the first preset time of sending the DHCP request message, the DHCP request message is sent to the DHCP server to be tested again;
and if the response message is not received within the second preset time of retransmitting the DHCP request message and the frequency of retransmitting the DHCP request message is preset frequency, determining that the state of the DHCP server to be tested is an unavailable state.
After the step of waiting for receiving a response message returned by the DHCP server to be tested according to the DHCP request message and determining whether the state of the DHCP server to be tested is an available state according to whether the response message is received, the detection method further includes:
and if the current state of the DHCP server to be tested is an unavailable state, carrying out DHCP server switching processing or network fault diagnosis processing.
In order to achieve the above object, an embodiment of the present invention further provides a device for detecting a state of a DHCP server, which is applied to a DHCP relay, and includes:
the acquisition module is used for acquiring parameter information required by the DHCP server to be tested to respond the DHCP request message;
the generating module is used for generating a DHCP request message carrying the parameter information and sending the DHCP request message to the DHCP server to be tested;
and the determining module is used for waiting for receiving a response message returned by the DHCP server to be detected according to the DHCP request message, and determining whether the state of the DHCP server to be detected is an available state according to whether the response message is received or not.
Wherein the generating module comprises:
and the generation submodule is used for adding the parameter information into the option information of the DHCP message to obtain a DHCP request message carrying the parameter information.
Wherein the determining module comprises:
and the first determining submodule is used for determining that the state of the DHCP server to be tested is an available state if the response message is received within the first preset time of sending the DHCP request message.
Wherein the determining module comprises:
the resending submodule is used for resending the DHCP request message to the DHCP server to be tested if the response message is not received within the first preset time of sending the DHCP request message;
and the second determining submodule is used for determining that the state of the DHCP server to be tested is an unavailable state if the response message is not received within second preset time for retransmitting the DHCP request message and the number of retransmitting the DHCP request message is preset number.
The above mentioned detection device for detecting the state of the DHCP server further includes:
and the processing module is used for switching the DHCP server or diagnosing network faults if the current state of the DHCP server to be tested is an unavailable state.
In order to achieve the above object, an embodiment of the present invention further provides a DHCP relay, including the above apparatus for detecting a DHCP server status.
The embodiment of the invention has the following beneficial effects:
according to the technical scheme of the embodiment of the invention, the DHCP relay acquires the parameter information required by the DHCP server to be tested to respond the DHCP request message; generating a DHCP request message carrying parameter information, and sending the DHCP request message to the DHCP server to be tested; and waiting for receiving a response message returned by the DHCP server to be tested according to the DHCP request message, and determining whether the state of the DHCP server to be tested is an available state or not according to whether the response message is received or not. The embodiment of the invention sends the DHCP request message meeting the requirements of the DHCP server to be detected through the DHCP relay to detect the active state of the DHCP server, thereby effectively improving the accuracy of the DHCP relay for detecting the state of the DHCP server.
Drawings
Fig. 1 is a first flowchart of a method for detecting a DHCP server status according to an embodiment of the present invention;
fig. 2 is a schematic networking diagram of a dynamic host configuration protocol DHCP relay in an embodiment of the present invention;
fig. 3 is a second flowchart of a method for detecting a DHCP server status according to an embodiment of the present invention;
fig. 4 is a block diagram of a detection apparatus for detecting a DHCP server status according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings.
The embodiment of the invention provides a method and a device for detecting the state of a DHCP server and a DHCP relay, which solve the problem that the existing DHCP relay is easy to misjudge when judging the active state of the DHCP server.
First embodiment
As shown in fig. 1, an embodiment of the present invention provides a method for detecting a state of a dynamic host configuration protocol DHCP server, which is applied to a dynamic host configuration protocol DHCP relay, where the DHCP relay may specifically be a device having a DHCP relay function, and as shown in fig. 2, the DHCP relay may be a first-level relay (DHCP relay 1) directly connected to a DHCP client or a cascaded DHCP relay (DHCP relay 2), where the method includes:
step 11: and acquiring parameter information required by the DHCP server to be tested to respond to the DHCP request message.
Here, the DHCP message is first explained as follows.
The message sent by the DHCP client to the DHCP server is called a DHCP request message, and the message sent by the DHCP server to the DHCP client is called a DHCP reply message. The types of the DHCP messages are divided into 8 types, namely DHCP Discover, DHCP Offer, DHCP Request, DHCP ACK, DHCP NAK, DHCP Release, DHCP Decline and DHCP Inform; the DHCP Discover, the DHCP Request, the DHCP Release, the DHCP Inform and the DHCP Decline are Request messages, the DHCP Offer, the DHCP ACK and the DHCP NAK are response messages, the formats of the messages are the same, the messages of different types only have different values of some fields in the messages, and the DHCP message format is based on the BOOTP message format.
The parameter information may specifically be a field value in the DHCP request message, and corresponding parameter information is obtained according to a requirement of each DHCP server to be tested on the field value in the DHCP request message, so as to ensure that the server can respond to the DHCP request message.
Specifically, it is possible to verify in advance which messages the DHCP server to be tested can respond to, and then obtain corresponding parameter information (some field values) according to the format of the DHCP request message to which the server to be tested can respond, and construct a corresponding DHCP request message.
Step 12: and generating a DHCP request message carrying the parameter information, and sending the DHCP request message to the DHCP server to be tested.
Specifically, the parameter information is added to the option information of the DHCP message to obtain the DHCP message carrying the parameter information, and the DHCP message carrying the parameter information completely meets the requirements of the DHCP server, thereby improving the response probability of the DHCP server to the DHCP message.
In addition, the DHCP REQUEST message may be a DHCP DISCOVER message or a DHCP REQUEST message.
In the embodiment of the invention, the DHCP relay starts a detection mechanism, and the DHCP relay autonomously generates and sends a DHCP REQUEST message (DHCP DISCOVER or DHCP REQUEST). The DHCP request message carries option information, and the requirement of a DHCP server is completely met.
Step 13: waiting for receiving a response message returned by the DHCP server to be tested according to the DHCP request message, and determining whether the state of the DHCP server to be tested is an available state according to whether the response message is received or not.
Here, after the DHCP relay sends the DHCP message, if the response of the DHCP server is received within the valid time, the state of the DHCP server is considered to be available; if the response of the DHCP server is not received within the effective time, the DHCP request message is tried to be retransmitted, and the response of the DHCP server is not received after the retransmission for many times, so that the state of the DHCP server is considered as unavailable.
In addition, the DHCP relay device may use the above detection result for switching the DHCP server to keep the service uninterrupted, or use the result for network fault diagnosis.
In the method for detecting the state of the DHCP server, a DHCP relay acquires parameter information required by the DHCP server to be detected to respond to a DHCP request message; generating a DHCP request message carrying parameter information, and sending the DHCP request message to the DHCP server to be tested; and waiting for receiving a response message returned by the DHCP server to be tested according to the DHCP request message, and determining whether the state of the DHCP server to be tested is an available state or not according to whether the response message is received or not. The embodiment of the invention sends the DHCP request message meeting the requirements of the DHCP server to be detected through the DHCP relay to detect the active state of the DHCP server, thereby effectively improving the accuracy of the DHCP relay for detecting the state of the DHCP server.
Second embodiment
As shown in fig. 3, an embodiment of the present invention further provides a method for detecting a state of a dynamic host configuration protocol DHCP server, which is applied to a dynamic host configuration protocol DHCP relay, where the DHCP relay may specifically be a device having a DHCP relay function, and as shown in fig. 2, the DHCP relay may be a first-stage relay (DHCP relay 1) directly connected to a DHCP client or a cascaded DHCP relay (DHCP relay 2), where the method for detecting a state of a DHCP server includes:
step 31: and acquiring parameter information required by the DHCP server to be tested to respond to the DHCP request message.
This step is the same as step 11 above and will not be described here.
Step 32: and generating a DHCP request message carrying the parameter information, and sending the DHCP request message to the DHCP server to be tested.
Specifically, the parameter information is added to the option information of the DHCP message to obtain the DHCP message carrying the parameter information, and the DHCP message carrying the parameter information completely meets the requirements of the DHCP server, thereby improving the response probability of the DHCP server to the DHCP message.
In addition, the DHCP REQUEST message may be a DHCP DISCOVER message or a DHCP REQUEST message.
In the embodiment of the invention, the DHCP relay starts a detection mechanism, and the DHCP relay autonomously generates and sends a DHCP REQUEST message (DHCP DISCOVER or DHCP REQUEST). The DHCP request message carries option information, and the requirement of a DHCP server is completely met.
By generating the DHCP message carrying the parameter information, the problem that the DHCP relay misjudges that the state of the DHCP server is unavailable due to silent discarding of the server because the request message of some DHCP clients does not accord with the requirement of the DHCP server is avoided.
Step 33: and if the response message is received within the first preset time of sending the DHCP request message, determining that the state of the DHCP server to be tested is an available state.
Step 34: and if the response message is not received within the first preset time of sending the DHCP request message, the DHCP request message is sent to the DHCP server to be tested again.
Step 35: and if the response message is not received within the second preset time of retransmitting the DHCP request message and the frequency of retransmitting the DHCP request message is preset frequency, determining that the state of the DHCP server to be tested is an unavailable state.
The first preset time and the second preset time can be set according to the requirements of users. By sending the DHCP request message to the server for multiple times, the accuracy of the DHCP server state detection is further improved.
Step 36: and if the current state of the DHCP server to be tested is an unavailable state, carrying out DHCP server switching processing or network fault diagnosis processing.
The detection method of the embodiment of the invention can effectively improve the accuracy of the DHCP relay on the detection of the state of the DHCP server, and the detection result can be used for network disaster tolerance; the detection result can also be used for network fault diagnosis. Meanwhile, the invention completely conforms to the standard protocol, has no docking problem, does not need special treatment of other equipment, and reduces the equipment burden.
The third embodiment:
as shown in fig. 4, an embodiment of the present invention further provides a device for detecting a state of a DHCP server, which is applied to a DHCP relay, and includes:
the acquiring module 41 is configured to acquire parameter information required by the DHCP server to be tested to respond to the DHCP request message;
the generating module 42 is configured to generate a DHCP request packet carrying the parameter information, and send the DHCP request packet to the DHCP server to be tested;
and the determining module 43 is configured to wait for receiving a response message returned by the DHCP server to be tested according to the DHCP request message, and determine whether the state of the DHCP server to be tested is an available state according to whether the response message is received.
In the apparatus for detecting a DHCP server status in a DHCP, the generating module 42 includes:
the generating submodule 421 is configured to add the parameter information to the option information of the DHCP packet, so as to obtain a DHCP request packet carrying the parameter information.
In the apparatus for detecting a DHCP server status in a DHCP protocol, the determining module 43 includes:
the first determining submodule 431 is configured to determine that the state of the DHCP server to be tested is an available state if the response message is received within a first predetermined time of sending the DHCP request message.
In the apparatus for detecting a DHCP server status in a DHCP protocol, the determining module 43 includes:
a resending submodule 432, configured to resend the DHCP request message to the DHCP server to be tested if the response message is not received within the first predetermined time of sending the DHCP request message;
the second determining submodule 433 is configured to determine that the state of the DHCP server to be tested is an unavailable state if the response message is not received within the second predetermined time of resending the DHCP request message and the number of resending the DHCP request message is a predetermined number.
The detection device for the state of the dynamic host configuration protocol DHCP server of the embodiment of the invention also comprises:
and the processing module 44 is configured to perform DHCP server switching processing or network fault diagnosis processing if the current state of the DHCP server to be tested is an unavailable state.
The embodiment of the invention also provides a Dynamic Host Configuration Protocol (DHCP) relay, which comprises the detection device for the state of the DHCP server.
It should be noted that the apparatus and the DHCP relay are apparatuses and DHCP relays corresponding to the above method embodiments, and all implementation manners in the above method embodiments are applicable to the apparatus and the DHCP relay embodiments, and the same technical effects can be achieved.
The detection device for the state of the DHCP server and the DHCP relay of the embodiment of the invention acquire the parameter information required by the DHCP server to be detected to respond the DHCP request message; generating a DHCP request message carrying parameter information, and sending the DHCP request message to the DHCP server to be tested; and waiting for receiving a response message returned by the DHCP server to be tested according to the DHCP request message, and determining whether the state of the DHCP server to be tested is an available state or not according to whether the response message is received or not. The embodiment of the invention sends the DHCP request message meeting the requirements of the DHCP server to be detected through the DHCP relay to detect the active state of the DHCP server, thereby effectively improving the accuracy of the DHCP relay for detecting the state of the DHCP server.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (9)

1. A method for detecting the state of a Dynamic Host Configuration Protocol (DHCP) server is characterized by comprising the following steps:
the method comprises the following steps that a DHCP relay in the same network with a DHCP client side obtains parameter information required by a DHCP server to be tested to respond a DHCP request message, wherein the parameter information comprises any one of the following:
obtaining a value of a certain field in the DHCP request message, and acquiring corresponding parameter information according to the requirement of each DHCP server to be tested on the value of the field in the DHCP request message;
the method comprises the steps that corresponding parameter information is obtained according to the format of a DHCP request message which can be responded by a DHCP server to be tested by verifying the message which can be responded by the DHCP server to be tested in advance;
the DHCP relay adds the parameter information in the option information of the DHCP message to obtain a DHCP request message carrying the parameter information, and sends the DHCP request message carrying the parameter information to the DHCP server to be tested;
and the DHCP relay waits for receiving a response message returned by the DHCP server to be tested according to the DHCP request message, and determines whether the state of the DHCP server to be tested is an available state according to whether the response message is received or not.
2. The method for detecting the state of the DHCP server according to claim 1, wherein determining whether the state of the DHCP server to be tested is an available state according to whether the response message is received comprises:
and if the response message is received within the first preset time of sending the DHCP request message, determining that the state of the DHCP server to be tested is an available state.
3. The method for detecting the state of the DHCP server according to claim 1, wherein determining whether the state of the DHCP server to be tested is an available state according to whether the response message is received comprises:
if the response message is not received within the first preset time of sending the DHCP request message, the DHCP request message is sent to the DHCP server to be tested again;
and if the response message is not received within the second preset time of retransmitting the DHCP request message and the frequency of retransmitting the DHCP request message is preset frequency, determining that the state of the DHCP server to be tested is an unavailable state.
4. The method for detecting the state of the DHCP server according to claim 1, wherein after waiting for receiving a response message returned by the DHCP server to be tested according to the DHCP request message, and determining whether the state of the DHCP server to be tested is an available state according to whether the response message is received, the method further comprises:
and if the current state of the DHCP server to be tested is an unavailable state, carrying out DHCP server switching processing or network fault diagnosis processing.
5. A detection device for the state of a Dynamic Host Configuration Protocol (DHCP) server is applied to DHCP relay and is characterized by comprising the following steps:
the acquisition module is used for acquiring parameter information required by the DHCP server to be tested to respond the DHCP request message, wherein the parameter information comprises any one of the following:
obtaining a value of a certain field in the DHCP request message, and acquiring corresponding parameter information according to the requirement of each DHCP server to be tested on the value of the field in the DHCP request message;
the method comprises the steps that corresponding parameter information is obtained according to the format of a DHCP request message which can be responded by a DHCP server to be tested by verifying the message which can be responded by the DHCP server to be tested in advance;
the generation module is used for adding the parameter information into the option information of the DHCP message to obtain a DHCP request message carrying the parameter information and sending the DHCP request message carrying the parameter information to the DHCP server to be tested;
and the determining module is used for waiting for receiving a response message returned by the DHCP server to be detected according to the DHCP request message, and determining whether the state of the DHCP server to be detected is an available state according to whether the response message is received or not.
6. The apparatus for detecting the status of a Dynamic Host Configuration Protocol (DHCP) server according to claim 5, wherein the determining module comprises:
and the first determining submodule is used for determining that the state of the DHCP server to be tested is an available state if the response message is received within the first preset time of sending the DHCP request message.
7. The apparatus for detecting the status of a Dynamic Host Configuration Protocol (DHCP) server according to claim 5, wherein the determining module comprises:
the resending submodule is used for resending the DHCP request message to the DHCP server to be tested if the response message is not received within the first preset time of sending the DHCP request message;
and the second determining submodule is used for determining that the state of the DHCP server to be tested is an unavailable state if the response message is not received within second preset time for retransmitting the DHCP request message and the number of retransmitting the DHCP request message is preset number.
8. The apparatus for detecting the status of a Dynamic Host Configuration Protocol (DHCP) server according to claim 5, further comprising:
and the processing module is used for switching the DHCP server or diagnosing network faults if the current state of the DHCP server to be tested is an unavailable state.
9. A dynamic host configuration protocol, DHCP, relay comprising means for detecting a state of a DHCP server according to any one of claims 5 to 8.
CN201610912022.4A 2016-10-19 2016-10-19 DHCP server state detection method and device and DHCP relay Active CN107968845B (en)

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CN1909482A (en) * 2005-08-05 2007-02-07 华为技术有限公司 Method for realizing detection of DHCP service performance
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