CN101997920A - DHCP lease processing method and device - Google Patents

DHCP lease processing method and device Download PDF

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Publication number
CN101997920A
CN101997920A CN2010105500886A CN201010550088A CN101997920A CN 101997920 A CN101997920 A CN 101997920A CN 2010105500886 A CN2010105500886 A CN 2010105500886A CN 201010550088 A CN201010550088 A CN 201010550088A CN 101997920 A CN101997920 A CN 101997920A
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China
Prior art keywords
lease
client
dhcp
pond
dhcp lease
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Pending
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CN2010105500886A
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Chinese (zh)
Inventor
张晓东
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ZTE Corp
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ZTE Corp
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Priority to CN2010105500886A priority Critical patent/CN101997920A/en
Publication of CN101997920A publication Critical patent/CN101997920A/en
Priority to PCT/CN2011/075899 priority patent/WO2012065436A1/en
Pending legal-status Critical Current

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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
    • H04L61/5053—Lease time; Renewal aspects
    • 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]

Abstract

The invention discloses a dynamic host control protocol (DHCP) lease processing method and device. The method comprises the following steps: acquiring the DHCP leases of the clients from the lease pool in use and sending the detecting packet which detects whether the DHCP leases of the clients are valid to the clients; re-sending the detecting packet if failing to receive the response information fed back by the clients in the preset time period; and determining that the DHCP leases of the clients are invalid and releasing the resources occupied by the DHCP leases of the clients if the detecting packet which is continuously sent N times fails to receive the response information fed back by the clients, wherein the lease pool in use stores the DHCP leases which are in use and are valid at present and the client information corresponding to the DHCP leases; and N is a natural number. The invention can improve the availability of the IP address resources.

Description

DHCP lease processing method and device
Technical field
The present invention relates to data communication field, in particular to a kind of DHCP lease processing method and device.
Background technology
For fear of IP (Internet Protocol, Internet Protocol) the permanent client of distributing in address, cause IP address resource deficiency, provide the lease function to avoid this situation among the DHCP (Dynamic Host Control Protocol, Dynamic Host Control Protocol).All there is certain lease phase the IP address of distributing to client, and for example, the lease phase of Microsoft's Dynamic Host Configuration Protocol server is defaulted as 8 days.
Behind lease expires, if client is not re-rented approximately, then Dynamic Host Configuration Protocol server can be regained the IP address of distributing to this client, provides other clients that need the IP address to use.Before lease expires, the client that exists some to use lease no longer needs the situation of this lease, such as: break down shutdown etc., but the IP address resource that these leases still take can not offer other clients that need lease and use, and causes IP address resource utilance to reduce.
Problem at IP address resource utilance in the correlation technique reduces does not propose effective solution at present as yet.
Summary of the invention
Main purpose of the present invention is to provide a kind of Dynamic Host Control Protocol DHCP lease processing method and device, to solve the problem that IP address resource utilance reduces in the above-mentioned correlation technique at least.
According to an aspect of the present invention, a kind of DHCP lease processing method is provided, comprise: from the lease pond, obtaining the DHCP lease of client, send the DHCP lease detection messages whether effectively that detects described client to described client, wherein, described in the lease pond storage using and current effective DHCP lease and with its corresponding client client information; If in the Preset Time section, do not receive the response message of described client feedback, then resend described detection messages; If the described detection messages that N continuous time sends is not all received the response message of described client feedback, determine that then the DHCP lease of described client is invalid, and discharge the resource that the DHCP lease of described client takies that wherein, N is a natural number.
More excellent, described from the lease pond, obtaining the DHCP lease of client, comprise: utilize lease to detect timer cycle from obtain the DHCP lease of client with the lease pond, described lease detects timer then, from obtain the DHCP lease of client with the lease pond.
More excellent, it is 1 hour that described lease detects the timer timing.
More excellent, send the DHCP lease detection messages whether effectively that detects described client to described client, comprising: when described client when Dynamic Host Configuration Protocol server is in same subnet, to described client transmission address resolution protocol arp message; When described client and Dynamic Host Configuration Protocol server are not in same subnet, send ICMP icmp message to described client.
More excellent, the resource that the DHCP lease of the described client of described release takies, comprise: the resource that the DHCP lease of described client is taken is released into the lease pond of exceeding the time limit, wherein, the client-side information that storage has been exceeded the time limit the DHCP lease that discharges and taken the described DHCP lease that discharges of having exceeded the time limit before in the described lease pond of exceeding the time limit.
More excellent, described if in the Preset Time section, do not receive the response message of described client feedback, then resend described detection messages, comprise: utilize the response timeout timer to wait for client's response, if described response timeout timer expiry is not received the response message of described client feedback yet, then resend described detection messages, wherein, described response timeout timer timing is 2 seconds.
More excellent, N=3.
According to a further aspect in the invention, a kind of DHCP lease processing unit is provided, comprise: transmitting element, be used for from the DHCP lease that obtains client with the lease pond, send the DHCP lease detection messages whether effectively that detects described client to described client, wherein, described in the lease pond storage using and current effective DHCP lease and with its corresponding client client information; If the response of not receiving described client in the Preset Time section then resends described detection messages; Determining unit is used for if the described detection messages that N continuous time sends is not all received the response message of described client feedback, determines that then the DHCP lease of described client is invalid, and discharges the resource that the DHCP lease of described client takies, and wherein, N is a natural number.
More excellent, described transmitting element is further used for: when described client and Dynamic Host Configuration Protocol server are in same subnet, send address resolution protocol arp message to described client; When described client and Dynamic Host Configuration Protocol server are not in same subnet, send ICMP icmp message to described client.
More excellent, described determining unit is further used for: the resource that the DHCP lease of described client is taken is released into the lease pond of exceeding the time limit, wherein, the client-side information that storage has been exceeded the time limit the DHCP lease that discharges and taken the described DHCP lease that discharges of having exceeded the time limit before in the described lease pond of exceeding the time limit.
In embodiments of the present invention, from with the lease pond, obtaining the DHCP lease of client, and detect the validity of this DHCP lease, if the detection messages of N continuous time transmission is not all received the response message of client feedback, the DHCP lease of then determining client is invalid, and discharges the resource that the DHCP lease of client takies, and the resource that the client that no longer needs lease can be taken discharges, follow-up other clients of can distributing to are used, and have improved the availability of IP address resource.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the process chart according to the DHCP lease processing method of the embodiment of the invention;
Fig. 2 is the process chart to the detection of lease validity according to the embodiment of the invention;
Fig. 3 is the typical networking schematic diagram of handling according to the DHCP lease of the embodiment of the invention;
Fig. 4 is the structural representation according to the DHCP lease processing unit of the embodiment of the invention;
Fig. 5 is the structural representation according to the lease detection module of the embodiment of the invention.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Mention in the correlation technique, before lease expires, the client that exists some to use lease no longer needs the situation of this lease, such as: break down, shutdown etc., but the IP address resource that these leases still take can not offer other clients that need lease and use, and causes IP address resource utilance to reduce.For solving the problems of the technologies described above, the embodiment of the invention provides a kind of DHCP lease processing method, and its handling process comprises as shown in Figure 1:
Step 102, from the lease pond, obtaining the DHCP lease of client, effectively whether the DHCP lease that send to detect client to client detection messages, wherein, in the lease pond storage using and current effective DHCP lease and with its corresponding client client information;
Step 104, if in the Preset Time section, do not receive the response message of client feedback, then resend detection messages;
Step 106, if the detection messages that N continuous time sends is not all received the response message of client feedback, determine that then the DHCP lease of client is invalid, and discharge the resource that the DHCP lease of client takies that wherein, N is a natural number.
In embodiments of the present invention, from with the lease pond, obtaining the DHCP lease of client, and detect the validity of this DHCP lease, if the detection messages of N continuous time transmission is not all received the response message of client feedback, the DHCP lease of then determining client is invalid, and discharges the resource that the DHCP lease of client takies, and the resource that the client that no longer needs lease can be taken discharges, follow-up other clients of can distributing to are used, and have improved the availability of IP address resource.
During enforcement, from the DHCP lease that with the lease pond, obtains client numerous embodiments can be arranged, more excellent, can utilize lease to detect timer cycle from the lease pond, obtaining the DHCP lease of client, when lease detects timer then, from the lease pond, obtaining the DHCP lease of client.
Above-mentioned lease detects step and triggers by detecting timer cycle, and sense cycle can be provided with by the user, for example, 50 minutes, 50 seconds, or the like; Usually be defaulted as 1 hour.
During enforcement, detection messages can have multiple, and is more excellent, comprises address resolution protocol arp message and ICMP icmp message, and the enforcement environment of each detection messages is as follows:
When client and Dynamic Host Configuration Protocol server are in same subnet, send the arp message to client;
When client and Dynamic Host Configuration Protocol server are not in same subnet, send the icmp message to client.
During enforcement, discharge the resource that the DHCP lease of described client takies, the resource that the DHCP lease of client is taken is released into the lease pond of exceeding the time limit, wherein, and storage exceeded the time limit the client-side information of the DHCP lease that discharges of the DHCP lease that discharges and taking before that exceeded the time limit in the lease pond of exceeding the time limit.In subsequent applications, when being used up, can from the lease pond of exceeding the time limit, obtaining resource and then distribute to client as if the resource in the available lease pond, improved the utilance of IP address resource.
During enforcement, if in the Preset Time section, do not receive the response message of described client feedback, then resend detection messages, more excellent, can utilize the response timeout timer to control, if the response timeout timer expiry is not received the response message of client feedback yet, then resend detection messages.The time of response timeout timer also can be provided with by the user, for example, 15 minutes, 20 seconds, or the like, be defaulted as 2 seconds usually.
Usually, all do not respond, think then that client has not needed its DHCP lease that originally took, the resource release that it is corresponding if sent the detection messages client that surpasses 3 times.
The method that adopts the embodiment of the invention to provide can have been added a lease legitimacy measuring ability on Dynamic Host Configuration Protocol server, by sending the legitimacy that arp message or icmp message detect the client lease, realize simple, do not need to revise agreement, only need in existing dhcp server functionality, add above-mentioned functions and can realize.
Now the flow process that lease validity is detected is described, and flow chart sees also Fig. 2:
Step 202, configuration lease validity detected parameters (whether enabling detection, response timeout duration (acquiescence be 2 seconds once), maximum number of times (acquiescence is 3 times), the sense cycle (giving tacit consent to 1 hour) of detecting);
Step 204, when sense cycle then, trigger lease and detect;
Step 206, the detection timer of resetting;
Step 208, do not detect lease,, illustrate that all leases finish after testing, execution in step 210 and step 204 successively, otherwise execution in step 212 if obtain failure from the lease pond, obtaining;
Step 210, with the zero clearing of the detection of all leases sign;
Step 212, stamp for the lease obtain to detect sign, detect number of times and be set to 0;
Step 214, judge whether to satisfy the maximum number of times that detects, if, execution in step 222, not, execution in step 216;
Step 216, transmission detection messages detect number of times and add 1;
Step 218, reset detection timer and response timeout timer pick up counting;
If step 220 is received the detection response message before the response timeout timer expiry, then execution in step 206, otherwise, execution in step 214;
Step 222, with current lease from moving on to the lease pond of exceeding the time limit with the lease pond, remove detect sign and detected number of times after, execution in step 206.
During enforcement, the typical networking of the network environment that the embodiment of the invention is used comprises client 1,2 as shown in Figure 3, switch, and Dynamic Host Configuration Protocol server, client 2 is connected with Dynamic Host Configuration Protocol server through go-between.
Based on same inventive concept, the embodiment of the invention also provides a kind of DHCP lease processing unit, and its structure comprises as shown in Figure 4:
Transmitting element 401, be used for from the DHCP lease that obtains client with the lease pond, effectively whether the DHCP lease that send to detect client to client detection messages, wherein, in the lease pond storage using and current effective DHCP lease and and its corresponding client client information; If the response of in the Preset Time section, not receiving client, then described again detection messages:
Determining unit 402 is used for if the detection messages that N continuous time sends is not all received the response message of client feedback, determines that then the DHCP lease of client is invalid, and discharges the resource that the DHCP lease of client takies, and wherein, N is a natural number.
In one embodiment, transmitting element 401 can be further used for:
When client and Dynamic Host Configuration Protocol server are in same subnet, send the arp message to client;
When client and Dynamic Host Configuration Protocol server are not in same subnet, send the icmp message to client.
In one embodiment, determining unit 402 can be further used for: the resource that the DHCP lease of client is taken is released into the lease pond of exceeding the time limit, wherein, exceeded the time limit the client-side information of the DHCP lease that discharges of the DHCP lease that discharges and taking before that exceeded the time limit of storage in the lease pond that exceeds the time limit.
During enforcement, the embodiment of the invention can realize a lease detection module at the Dynamic Host Configuration Protocol server end, and this module and dhcp server functionality module need mutual lease to detect information, are used for Dynamic Host Configuration Protocol server and discharge available IP address resource in advance.
The lease detection module comprises following functional unit: timer function unit, lease administrative unit, detection messages transmitting element, detection messages receiving element, detection control unit, relation is referring to Fig. 5 between each unit.
Two timers of timer function Single Component Management: detect timer and response timeout timer.Detecting timer duration must be greater than the response timeout timer duration.
Detect the timer detection trigger operation that regularly circulates, be defaulted as 1 hour once, also can detect duration by manual appointment of user.
The response timeout timer is used for triggering overtime incident, and the validity to lease in overtime incident judges that overtime duration is defaulted as 2 seconds, also can specify overtime duration by hand by the user.
The lease administrative unit provides the function that administers and maintains in lease pond, mainly contain three lease ponds: with lease pond, the lease pond of exceeding the time limit, available lease pond, storage lease current effectively, that using reaches relevant user profile in the lease pond, exceed the time limit to store exceeded the time limit lease that discharges and the user profile that takies this lease before, the used lease information of the not distribution of storing in the available lease pond in the lease pond.Main operation has:
Detection timer expiry duration in the timer function unit expires, and the detection trigger control unit obtains the user profile of a lease from the lease pond, and concurrent lease validity detects;
Detect the lease that control unit is made a strategic decision out and need be discharged, notice lease administrative unit is released in the user profile with relevant lease in the lease pond; And this user's lease information put into the lease pond of exceeding the time limit;
Trigger the lease administrative unit by the dhcp server functionality module and from available lease pond, obtain an available lease information,, just obtain the lease pond from exceeding the time limit if available lease pond is empty;
The lease that normally exceeds the time limit to discharge in the available lease pond is put into the lease pond of exceeding the time limit.
The detection messages transmitting element is used for structure and sends arp or icmp message execution measuring ability, and detecting operation triggers by detecting control unit.
The detection messages receiving element receives the overtime incident that detects response message (arp or icmp response message) or response timeout timer, and notice detects control unit.
The detection control unit is cooperated mutually with other several functional units and is finished lease detection and lease management function:
Making a strategic decision out needs the lease of detection, and notice detection messages transmitting element detects; Need to write down detected lease information (detected client ip address has detected number of times) simultaneously.
Receive the testing result notice of detection messages receiving element, detection trigger operation: if receive correct response message, detect the legitimacy detection that control unit will trigger next lease, if overtime incident, and detect number of times and do not satisfy the maximum number of times (being defaulted as 3 times) that detects, need initiate detection again at current lease, otherwise trigger the detection of next lease.
The detecting operation frequency is detected the timer expiry duration and is expired by the control of timer control unit, and making a strategic decision out needs the lease of detection trigger, the detection trigger action.
Mutual with the lease pool unit, obtain lease to be detected; The testing result of the detected lease in notice lease pond.
As can be seen from the above description, the present invention has realized following technique effect:
In embodiments of the present invention, from with the lease pond, obtaining the DHCP lease of client, and detect the validity of this DHCP lease, if the detection messages of N continuous time transmission is not all received the response message of client feedback, the DHCP lease of then determining client is invalid, and discharges the resource that the DHCP lease of client takies, and the resource that the client that no longer needs lease can be taken discharges, follow-up other clients of can distributing to are used, and have improved the availability of IP address resource.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. a Dynamic Host Control Protocol DHCP lease processing method is characterized in that, comprising:
From with the lease pond, obtaining the DHCP lease of client, send the DHCP lease detection messages whether effectively that detects described client to described client, wherein, described in the lease pond storage using and current effective DHCP lease and with its corresponding client client information;
If in the Preset Time section, do not receive the response message of described client feedback, then resend described detection messages;
If the described detection messages that N continuous time sends is not all received the response message of described client feedback, determine that then the DHCP lease of described client is invalid, and discharge the resource that the DHCP lease of described client takies that wherein, N is a natural number.
2. method according to claim 1, it is characterized in that, described from the lease pond, obtaining the DHCP lease of client, comprise: utilize lease to detect timer cycle from the lease pond, obtaining the DHCP lease of client, described lease detects timer then, from obtain the DHCP lease of client with the lease pond.
3. method according to claim 2 is characterized in that, it is 1 hour that described lease detects the timer timing.
4. whether effectively method according to claim 1 is characterized in that, send the DHCP lease detection messages that detects described client to described client, comprising:
When described client and Dynamic Host Configuration Protocol server are in same subnet, send address resolution protocol arp message to described client;
When described client and Dynamic Host Configuration Protocol server are not in same subnet, send ICMP icmp message to described client.
5. according to each described method of claim 1 to 4, it is characterized in that, the resource that the DHCP lease of the described client of described release takies, comprise: the resource that the DHCP lease of described client is taken is released into the lease pond of exceeding the time limit, wherein, the client-side information that storage has been exceeded the time limit the DHCP lease that discharges and taken the described DHCP lease that discharges of having exceeded the time limit before in the described lease pond of exceeding the time limit.
6. according to each described method of claim 1 to 4, it is characterized in that, described if in the Preset Time section, do not receive the response message of described client feedback, then resend described detection messages, comprise: utilize the response timeout timer to wait for client's response,, then resend described detection messages if described response timeout timer expiry is not received the response message of described client feedback yet, wherein, described response timeout timer timing is 2 seconds.
7. according to each described method of claim 1 to 4, it is characterized in that N=3.
8. a Dynamic Host Control Protocol DHCP lease processing unit is characterized in that, comprising:
Transmitting element, be used for from the DHCP lease that obtains client with the lease pond, send the DHCP lease detection messages whether effectively that detects described client to described client, wherein, described in the lease pond storage using and current effective DHCP lease and with its corresponding client client information; If the response of not receiving described client in the Preset Time section then resends described detection messages;
Determining unit is used for if the described detection messages that N continuous time sends is not all received the response message of described client feedback, determines that then the DHCP lease of described client is invalid, and discharges the resource that the DHCP lease of described client takies, and wherein, N is a natural number.
9. device according to claim 8 is characterized in that, described transmitting element is further used for:
When described client and Dynamic Host Configuration Protocol server are in same subnet, send address resolution protocol arp message to described client;
When described client and Dynamic Host Configuration Protocol server are not in same subnet, send ICMP icmp message to described client.
10. according to Claim 8 or 9 described devices, it is characterized in that, described determining unit is further used for: the resource that the DHCP lease of described client is taken is released into the lease pond of exceeding the time limit, wherein, the client-side information that storage has been exceeded the time limit the DHCP lease that discharges and taken the described DHCP lease that discharges of having exceeded the time limit before in the described lease pond of exceeding the time limit.
CN2010105500886A 2010-11-18 2010-11-18 DHCP lease processing method and device Pending CN101997920A (en)

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CN2010105500886A CN101997920A (en) 2010-11-18 2010-11-18 DHCP lease processing method and device
PCT/CN2011/075899 WO2012065436A1 (en) 2010-11-18 2011-06-17 Method and apparatus for processing dynamic host control protocol leases

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CN103714183A (en) * 2014-01-10 2014-04-09 浪潮(北京)电子信息产业有限公司 Dynamic acquisition method and system for metadata lease time
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WO2012065436A1 (en) * 2010-11-18 2012-05-24 中兴通讯股份有限公司 Method and apparatus for processing dynamic host control protocol leases
CN103714183A (en) * 2014-01-10 2014-04-09 浪潮(北京)电子信息产业有限公司 Dynamic acquisition method and system for metadata lease time
CN103714183B (en) * 2014-01-10 2017-02-15 浪潮(北京)电子信息产业有限公司 Dynamic acquisition method and system for metadata lease time
CN104579827A (en) * 2014-12-24 2015-04-29 北京华胜天成科技股份有限公司 IP (Internet protocol) address conflict detecting method and device
CN110661902A (en) * 2019-09-26 2020-01-07 浪潮商用机器有限公司 Method for monitoring client renewal
CN115002077A (en) * 2021-03-01 2022-09-02 炬芯科技股份有限公司 Method for DHCP client to obtain IP address and related equipment
CN115002077B (en) * 2021-03-01 2024-03-22 炬芯科技股份有限公司 Method for DHCP client to acquire IP address and related equipment
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CN113572830A (en) * 2021-07-16 2021-10-29 牙木科技股份有限公司 Address allocation method, address allocation system, and computer-readable storage medium
CN115460176A (en) * 2022-09-29 2022-12-09 苏州浪潮智能科技有限公司 Invalid address recovery method, device, equipment and medium for DHCP server
CN115460176B (en) * 2022-09-29 2023-10-03 苏州浪潮智能科技有限公司 Method, device, equipment and medium for recovering invalid address of DHCP server

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Application publication date: 20110330