CN110995877B - Method for automatically updating IP address, snooping equipment and DHCP server - Google Patents
Method for automatically updating IP address, snooping equipment and DHCP server Download PDFInfo
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- CN110995877B CN110995877B CN201911097931.7A CN201911097931A CN110995877B CN 110995877 B CN110995877 B CN 110995877B CN 201911097931 A CN201911097931 A CN 201911097931A CN 110995877 B CN110995877 B CN 110995877B
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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]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/02—Standardisation; Integration
- H04L41/0213—Standardised network management protocols, e.g. simple network management protocol [SNMP]
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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
- H04L61/5076—Update or notification mechanisms, e.g. DynDNS
Abstract
The invention provides a method for automatically updating an IP address, snooping equipment and a server, wherein the method is applied to the snooping equipment and comprises the following steps: receiving a first Dynamic Host Configuration Protocol (DHCP) request message sent by a first terminal, adding an identifier of a snooping device into the first DHCP request message to form a second DHCP request message, and sending the second DHCP request message to a DHCP server according to a pre-stored DHCP server address so that the DHCP server can obtain the identifier from the second DHCP request message and store the corresponding relation between an IP address to be allocated to the first terminal and the identifier; and when the snooping device is restarted, the identification is sent to a DHCP server, so that the DHCP server can search the IP address of the first terminal corresponding to the identification from the corresponding relation according to the identification, and indicate the first terminal to actively release the IP address according to the IP address of the first terminal and restart a DHCP request. The usability of the scheme is improved.
Description
Technical Field
The invention relates to the field of data communication, in particular to a method for automatically updating an IP address, snooping equipment and a DHCP server.
Background
Currently, the dynamic host configuration protocol DHCP is widely used to dynamically allocate reusable network resources, such as IP addresses. A typical DHCP process for acquiring an IP address is as follows:
1. and the DHCP Client sends a DHCP DISCOVER broadcast message to the DHCP Server, and retransmits the DHCP DISCOVER message if the Client does not receive the response of the Server within a certain time.
2. After receiving the DHCP DISCOVER message, the DHCP server allocates an IP address to the Client according to a certain strategy and then sends out a DHCP OFFER message.
3. After receiving the DHCP OFFER message, the DHCP client sends out a DHCP REQUEST to lease the IP address in the address pool of the DHCP server and inform other servers of receiving the IP address allocated by the DHCP server.
4. The DHCP server receives the DHCP REQUEST message, verifies whether the resources can be allocated, and sends a DHCP ACK message if the resources can be allocated; and if the allocation is unavailable, sending a DHCP NAK message. And the DHCP client starts to use the IP address distributed by the DHCP server after receiving the DHCP ACK message. And if the DHCP NAK is received, retransmitting the DHCP DISCOVER message.
Wherein the content of the first and second substances,
DHCP Snooping: the monitoring of the use condition of the user IP address is realized by snooping the DHCP interaction message between the DHCP client and the DHCP server, which means DHCP snooping.
DHCP Snooping binding database: the problem that a user sets a static IP address randomly often occurs in a network in a DHCP environment, and the IP address set randomly by the user not only makes the network difficult to maintain, but also causes some legal users who use DHCP to obtain IP to be unable to use the network normally due to conflict. The DHCP Snooping forms a user record table item by Snooping interactive messages between the DHCPclient and the DHCPServer and combining IP information acquired by a user and information such as user MAC, VID, PORT, lease time and the like, thereby forming a binding database of the DHCP Snooping, and matching with the use of an address resolution protocol ARP detection function or an ARP CHECK function, further achieving the purpose of controlling the user to legally use an IP address.
However, in the scenario shown in fig. 1, when the device where the DHCP Snooping is located is suddenly restarted due to a power failure, the IP source address binding database in the device is not restarted, and at this time, the downstream PC1 cannot surf the internet although it has an IP address, and must manually reacquire the address to surf the internet.
Disclosure of Invention
In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme:
a method for automatically updating IP address is applied to snooping equipment and comprises the following steps: receiving a first Dynamic Host Configuration Protocol (DHCP) request message sent by a first terminal, adding an identifier of a snooping device into the first DHCP request message to form a second DHCP request message, and sending the second DHCP request message to a DHCP server according to a pre-stored DHCP server address so that the DHCP server can obtain the identifier from the second DHCP request message and store the corresponding relation between an IP address to be allocated to the first terminal and the identifier;
and when the snooping device is restarted, the identification is sent to the DHCP server, so that the DHCP server can search the IP address of the first terminal corresponding to the identification from the corresponding relation according to the identification, and indicate the first terminal to actively release the IP address and reinitiate a DHCP request according to the IP address of the first terminal.
Optionally, the method further includes:
the address of the DHCP server and the identity of the snooping device are configured.
Optionally, when the snooping device is restarted, the step of sending the identifier to the DHCP server, so that the DHCP server searches an IP address of the first terminal corresponding to the identifier from the correspondence according to the identifier, and instructs the first terminal to actively release the IP address and restart a DHCP request according to the IP address of the first terminal specifically includes:
and when the snooping device is restarted, sending the identifier to the DHCP server through a Simple Network Management Protocol (SNMP) message so that the DHCP server can search the IP address of the first terminal corresponding to the identifier from the corresponding relation according to the identifier, and instruct the first terminal to actively release the IP address and restart a DHCP request according to the IP address of the first terminal.
Another aspect of the present invention further provides a method for automatically updating an IP address, which is applied in a DHCP server, and includes the following steps:
receiving a second DHCP request message forwarded by snooping equipment, wherein the second DHCP request message is formed by adding an identifier of the snooping equipment to a first DHCP request message sent by a first terminal after the snooping equipment receives the first DHCP request message;
acquiring the identifier from the second DHCP request message, and storing the corresponding relation between the IP address to be allocated to the first terminal and the identifier,
when the snooping device is restarted, the identification sent by the snooping device is received, the IP address of the first terminal corresponding to the identification is searched from the corresponding relation according to the identification, and the first terminal is indicated to actively release the IP address according to the IP address of the first terminal and restart a DHCP request.
Optionally, when the snooping device is restarted, the step of receiving the identifier sent by the snooping device specifically includes:
and when the snooping device is restarted, receiving the identifier sent by the snooping device through a Simple Network Management Protocol (SNMP) message.
Another aspect of the present invention is to provide a snooping device for automatically updating an IP address, including:
a first receiving module, configured to receive a first DHCP request message sent by a first terminal,
an adding module, configured to add an identifier of a snooping device to the first DHCP request message to form a second DHCP request message,
the first sending module is used for sending the second DHCP request message to the DHCP server according to a pre-stored DHCP server address so that the DHCP server can acquire the identifier from the second DHCP request message and store the corresponding relation between the IP address to be allocated to the first terminal and the identifier;
and the second sending module is used for sending the identifier to the DHCP server when the snooping device is restarted, so that the DHCP server can search the IP address of the first terminal corresponding to the identifier from the corresponding relation according to the identifier, and indicate the first terminal to actively release the IP address according to the IP address of the first terminal and restart a DHCP request.
Optionally, the snooping device further includes:
and the configuration module is used for configuring the address of the DHCP server and the identification of the snooping device.
Optionally, the second sending module is specifically configured to:
and when the snooping device is restarted, sending the identifier to the DHCP server through a Simple Network Management Protocol (SNMP) message so that the DHCP server can search the IP address of the first terminal corresponding to the identifier from the corresponding relation according to the identifier, and instruct the first terminal to actively release the IP address and restart a DHCP request according to the IP address of the first terminal.
Another aspect of the present invention further provides a DHCP server, including:
the second receiving module is used for receiving a second DHCP request message forwarded by the snooping device, wherein the second DHCP request message is formed by adding the identifier of the snooping device to a first DHCP request message sent by a first terminal after the snooping device receives the first DHCP request message;
an obtaining module, configured to obtain the identifier from the second DHCP request message,
a storage module for storing a correspondence between an IP address to be assigned to the first terminal and the identifier,
a third receiving module, configured to receive the identifier sent by the snooping device when the snooping device restarts,
a searching module, configured to search the corresponding relation for the IP address of the first terminal corresponding to the identifier according to the identifier,
and the indicating module is used for indicating the first terminal to actively release the IP address and re-send a DHCP request according to the IP address of the first terminal.
Optionally, the third receiving module is specifically configured to,
and when the snooping device is restarted, receiving the identifier sent by the snooping device through a Simple Network Management Protocol (SNMP) message.
The embodiment of the invention has the advantages that in the access security environment, after the snooping device is restarted, the terminal can automatically apply for the address, no perception is realized for the user, the internet surfing security can be ensured, and the usability of the scheme is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a prior art system block diagram;
FIG. 2 is a flow chart of a method provided by an embodiment of the present invention;
FIG. 3 is a flowchart of a method provided by an embodiment of the present invention;
FIG. 4 is a block diagram of an apparatus according to an embodiment of the present invention;
fig. 5 is a diagram illustrating a structure of an apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a method for automatically updating an IP address, which is applied to snooping equipment, and comprises the following steps as shown in figure 2:
s201, receiving a first Dynamic Host Configuration Protocol (DHCP) request message sent by a first terminal,
s203, adding the identification of the snooping device into the first DHCP request message to form a second DHCP request message,
specifically, an option node is added to the first DHCP request packet: option (100) defining an IP address of snooping equipment with snooping id of 32 bits so as to form a second DHCP request message;
s205, sending the second DHCP request message to the DHCP server according to the pre-stored DHCP server address, so that the DHCP server can obtain the identifier from the second DHCP request message, and store the corresponding relation between the IP address to be allocated to the first terminal and the identifier;
specifically, after receiving the second DHCP request message, the DHCP server parses an option (100) field, and binds the value of the field to the database: in the snooping-id field; and meanwhile, when recovering the ack message, the DHCP server binds the IP address to be allocated to the first terminal into a client-IP field of the database, so that a snooping-IP database table is formed and comprises the corresponding relation between the snooping-id and the client-IP.
S207, when the snooping device is restarted, the identification is sent to the DHCP server, so that the DHCP server can search the IP address of the first terminal corresponding to the identification from the corresponding relation according to the identification, and indicate the first terminal to actively release the IP address according to the IP address of the first terminal and restart a DHCP request.
The DHCP server may instruct the first terminal to actively release the IP address allocated to the first terminal by sending a message indicating that an IP address lease expires to the first terminal.
Optionally, the method further includes:
the address of the DHCP server and the identity of the snooping device are configured.
Optionally, step S207 specifically includes:
and when the snooping device is restarted, sending the identifier to the DHCP server through a Simple Network Management Protocol (SNMP) message so that the DHCP server can search the IP address of the first terminal corresponding to the identifier from the corresponding relation according to the identifier, and instruct the first terminal to actively release the IP address and restart a DHCP request according to the IP address of the first terminal.
The embodiment of the invention has the advantages that in the access security environment, after the snooping device is restarted, the terminal can automatically apply for the address, no perception is realized for the user, the internet surfing security can be ensured, and the usability of the scheme is improved.
Another aspect of the embodiments of the present invention further provides a method for automatically updating an IP address, which is applied in a DHCP server, as shown in fig. 3, and includes the following steps:
s301, receiving a second DHCP request message forwarded by a snooping device, wherein the second DHCP request message is formed by adding an identifier of the snooping device to a first DHCP request message sent by a first terminal after the snooping device receives the first DHCP request message;
s303, obtaining the identification from the second DHCP request message, and saving the corresponding relation between the IP address to be allocated to the first terminal and the identification,
s305, when the snooping device restarts, the identification sent by the snooping device is received,
s307, searching the IP address of the first terminal corresponding to the identification from the corresponding relation according to the identification,
s309, and according to the IP address of the first terminal, indicating the first terminal to actively release the IP address and reinitiate a DHCP request.
Optionally, the step S305 specifically includes:
and when the snooping device is restarted, receiving the identifier sent by the snooping device through a Simple Network Management Protocol (SNMP) message.
The embodiment of the invention has the advantages that in the access security environment, after the snooping device is restarted, the terminal can automatically apply for the address, no perception is realized for the user, the internet surfing security can be ensured, and the usability of the scheme is improved.
Another aspect of the embodiments of the present invention is to further provide a snooping device for automatically updating an IP address, as shown in fig. 4, including:
a first receiving module 401, configured to receive a first DHCP request message sent by a first terminal,
an adding module 403, configured to add an identifier of a snooping device to the first DHCP request message to form a second DHCP request message,
a first sending module 405, configured to send the second DHCP request packet to the DHCP server according to a pre-stored DHCP server address, so that the DHCP server obtains the identifier from the second DHCP request packet, and stores a correspondence between the IP address to be allocated to the first terminal and the identifier;
a second sending module 407, configured to send the identifier to the DHCP server when the snooping device is restarted, so that the DHCP server searches, according to the identifier, the IP address of the first terminal corresponding to the identifier from the correspondence, and instructs, according to the IP address of the first terminal, the first terminal to actively release the IP address and restart a DHCP request.
Optionally, the snooping device further includes:
and the configuration module is used for configuring the address of the DHCP server and the identification of the snooping device.
Optionally, the second sending module 407 is specifically configured to:
and when the snooping device is restarted, sending the identification to the DHCP server through a Simple Network Management Protocol (SNMP) message so that the DHCP server can search the IP address of the first terminal corresponding to the identification from the corresponding relation according to the identification, and instruct the first terminal to actively release the IP address according to the IP address of the first terminal and restart a DHCP request.
The embodiment of the invention has the advantages that in the access security environment, after the snooping device is restarted, the terminal can automatically apply for the address, no perception is realized for the user, the internet surfing security can be ensured, and the usability of the scheme is improved.
Another aspect of the embodiments of the present invention further provides a DHCP server, as shown in fig. 5, including:
a second receiving module 501, configured to receive a second DHCP request message forwarded by a snooping device, where the second DHCP request message is formed by adding, by the snooping device, an identifier of the snooping device to a first DHCP request message sent by a first terminal after the snooping device receives the first DHCP request message;
an obtaining module 503, configured to obtain the identifier from the second DHCP request message,
a storage module 505, configured to store a correspondence between the IP address to be allocated to the first terminal and the identifier,
a third receiving module 507, configured to receive the identifier sent by the snooping device when the snooping device restarts,
a searching module 509, configured to search, according to the identifier, an IP address of the first terminal corresponding to the identifier from the corresponding relationship,
an indicating module 511, configured to indicate, according to the IP address of the first terminal, the first terminal to actively release the IP address and re-initiate a DHCP request.
Optionally, the third receiving module 507 is specifically configured to,
and when the snooping device is restarted, receiving the identifier sent by the snooping device through a Simple Network Management Protocol (SNMP) message.
The embodiment of the invention has the advantages that in the access security environment, after the snooping device is restarted, the terminal can automatically apply for the address, no perception is realized for the user, the internet surfing security can be ensured, and the usability of the scheme is improved.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for automatically updating an IP address is applied to snooping equipment and comprises the following steps:
receiving a first Dynamic Host Configuration Protocol (DHCP) request message sent by a first terminal, adding an identifier of a snooping device into the first DHCP request message to form a second DHCP request message, and sending the second DHCP request message to a DHCP server according to a pre-stored DHCP server address so that the DHCP server can obtain the identifier from the second DHCP request message and store the corresponding relation between an IP address to be allocated to the first terminal and the identifier;
and when the snooping device is restarted, the identification is sent to the DHCP server, so that the DHCP server searches the IP address of the first terminal corresponding to the identification from the corresponding relation according to the identification, and indicates the first terminal to actively release the IP address and re-send a DHCP request according to the IP address of the first terminal.
2. The method of claim 1, further comprising:
the address of the DHCP server and the identity of the snooping device are configured.
3. The method according to claim 1, wherein the step of sending the identifier to the DHCP server when the snooping device restarts, so that the DHCP server searches the IP address of the first terminal corresponding to the identifier from the correspondence according to the identifier, and instructs the first terminal to actively release the IP address and restart a DHCP request according to the IP address of the first terminal specifically includes:
and when the snooping device is restarted, sending the identifier to the DHCP server through a Simple Network Management Protocol (SNMP) message so that the DHCP server can search the IP address of the first terminal corresponding to the identifier from the corresponding relation according to the identifier, and instruct the first terminal to actively release the IP address and restart a DHCP request according to the IP address of the first terminal.
4. A method for automatically updating an IP address is applied to a DHCP server and comprises the following steps:
receiving a second DHCP request message forwarded by snooping equipment, wherein the second DHCP request message is formed by adding an identifier of the snooping equipment to a first DHCP request message sent by a first terminal after the snooping equipment receives the first DHCP request message;
acquiring the identifier from the second DHCP request message, and storing the corresponding relation between the IP address to be allocated to the first terminal and the identifier,
when the snooping device is restarted, the identification sent by the snooping device is received, the IP address of the first terminal corresponding to the identification is searched from the corresponding relation according to the identification, and the first terminal is indicated to actively release the IP address according to the IP address of the first terminal and restart a DHCP request.
5. The method of claim 4, wherein said step of receiving said identification sent by said snooping device upon restart of said snooping device comprises in particular:
and when the snooping device is restarted, receiving the identifier sent by the snooping device through a Simple Network Management Protocol (SNMP) message.
6. A snooping device that automatically updates an IP address, comprising:
a first receiving module, configured to receive a first DHCP request message sent by a first terminal,
an adding module, configured to add an identifier of a snooping device to the first DHCP request message to form a second DHCP request message,
a first sending module, configured to send the second DHCP request message to the DHCP server according to a pre-stored DHCP server address, so that the DHCP server obtains the identifier from the second DHCP request message, and stores a correspondence between an IP address to be allocated to the first terminal and the identifier;
and the second sending module is used for sending the identifier to the DHCP server when the snooping device is restarted, so that the DHCP server can search the IP address of the first terminal corresponding to the identifier from the corresponding relation according to the identifier, and indicate the first terminal to actively release the IP address according to the IP address of the first terminal and restart a DHCP request.
7. The snooping device of claim 6, further comprising:
and the configuration module is used for configuring the address of the DHCP server and the identification of the snooping device.
8. The snooping device of claim 6, wherein the second sending module is specifically configured to:
and when the snooping device is restarted, sending the identifier to the DHCP server through a Simple Network Management Protocol (SNMP) message so that the DHCP server can search the IP address of the first terminal corresponding to the identifier from the corresponding relation according to the identifier, and instruct the first terminal to actively release the IP address and restart a DHCP request according to the IP address of the first terminal.
9. A dynamic host configuration protocol, DHCP, server, comprising:
the second receiving module is used for receiving a second DHCP request message forwarded by the snooping device, wherein the second DHCP request message is formed by adding the identifier of the snooping device to a first DHCP request message sent by a first terminal after the snooping device receives the first DHCP request message;
an obtaining module, configured to obtain the identifier from the second DHCP request message,
a storage module for storing a correspondence between an IP address to be assigned to the first terminal and the identifier,
a third receiving module, configured to receive the identifier sent by the snooping device when the snooping device restarts,
a searching module, configured to search the corresponding relation for the IP address of the first terminal corresponding to the identifier according to the identifier,
and the indicating module is used for indicating the first terminal to actively release the IP address and re-send a DHCP request according to the IP address of the first terminal.
10. The DHCP server of claim 9, wherein the third receiving module is specifically configured to,
and when the snooping device is restarted, receiving the identifier sent by the snooping device through a Simple Network Management Protocol (SNMP) message.
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| KR20090040588A (en) * | 2007-10-22 | 2009-04-27 | 주식회사 다산네트웍스 | Apparatus having dynamic host configuration protocol - snooping function |
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| CN102801555A (en) * | 2012-07-18 | 2012-11-28 | 深圳市同洲电子股份有限公司 | Network interruption recovering method and device |
| EP3337046A1 (en) * | 2015-09-14 | 2018-06-20 | Huawei Technologies Co., Ltd. | Communication method and device based on optical network system |
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| CN101060495A (en) * | 2007-05-22 | 2007-10-24 | 华为技术有限公司 | Message processing method, system and equipment |
| KR20090040588A (en) * | 2007-10-22 | 2009-04-27 | 주식회사 다산네트웍스 | Apparatus having dynamic host configuration protocol - snooping function |
| CN101883090A (en) * | 2010-04-29 | 2010-11-10 | 北京星网锐捷网络技术有限公司 | Client access method, equipment and system |
| CN102801555A (en) * | 2012-07-18 | 2012-11-28 | 深圳市同洲电子股份有限公司 | Network interruption recovering method and device |
| EP3337046A1 (en) * | 2015-09-14 | 2018-06-20 | Huawei Technologies Co., Ltd. | Communication method and device based on optical network system |
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