WO2015149635A1 - Procédé, appareil et système de libération de ressource d'adresse - Google Patents

Procédé, appareil et système de libération de ressource d'adresse Download PDF

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Publication number
WO2015149635A1
WO2015149635A1 PCT/CN2015/074760 CN2015074760W WO2015149635A1 WO 2015149635 A1 WO2015149635 A1 WO 2015149635A1 CN 2015074760 W CN2015074760 W CN 2015074760W WO 2015149635 A1 WO2015149635 A1 WO 2015149635A1
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WO
WIPO (PCT)
Prior art keywords
user equipment
access point
wireless access
dynamic host
host configuration
Prior art date
Application number
PCT/CN2015/074760
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English (en)
Chinese (zh)
Inventor
张长丰
徐亦斌
张印熙
张帅
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2015149635A1 publication Critical patent/WO2015149635A1/fr

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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
    • H04L2101/00—Indexing scheme associated with group H04L61/00
    • H04L2101/60—Types of network addresses
    • H04L2101/618—Details of network addresses
    • H04L2101/622—Layer-2 addresses, e.g. medium access control [MAC] addresses

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, device, and system for releasing an address resource.
  • the Dynamic Host Configuration Protocol (DHCP) packet can be sent to the DHCP server in two ways. One is local forwarding and the other is centralized forwarding. . In the local forwarding, the DHCP message sent by the user equipment is directly forwarded to the DHCP server by the access point (abbreviation: AP). In the centralized forwarding, the DHCP message sent by the user equipment is sent by the wireless AP. The controller (English: controller) is then forwarded by the controller to the DHCP server.
  • AP access point
  • controller International: controller
  • the DHCP server After the user equipment is authenticated, the DHCP server allocates an Internet Protocol (IP) address to the user equipment and determines the lease duration (English: lease duration).
  • IP Internet Protocol
  • the IP address can only be used by the user equipment before the lease expires. That is, the user equipment cannot use the IP address before the lease expires, regardless of whether the user equipment uses the IP address. Since the number of IP addresses that can be assigned by the DHCP server is limited, when the IP address on the DHCP server is allocated, if a new user device is online, the user device will not get an IP address and cannot access the network, but some have already The IP address assigned to the user equipment is not actually used, but the lease of the IP address has not arrived yet, resulting in waste of IP address resources.
  • IP Internet Protocol
  • the invention discloses an address resource release method, device and system for saving address resources.
  • a first aspect of the present invention discloses a method for releasing an address resource, including:
  • the AP obtains an offline message for the user equipment, where the offline message carries the hardware address of the user equipment;
  • the AP In the case that the AP is an authenticated AP of the user equipment, the AP sends a DHCP release message to the DHCP server, where the DHCP release message includes a hardware address of the user equipment.
  • the acquiring, by the AP, the offline message for the user equipment includes:
  • the AP receives the offline message sent by the user equipment.
  • the method further includes:
  • the AP receives a determination result sent by the controller.
  • the acquiring, by the AP, the offline message for the user equipment includes:
  • the AP receives the offline message sent by the controller for the user equipment, and the offline message also carries the reason for the offline of the user equipment;
  • the method further includes:
  • the AP determines, according to the offline reason of the user equipment, whether the AP is an authentication AP of the user equipment.
  • the method further includes:
  • the AP sends a DHCP release message generation request to the controller, where the DHCP release message generation request instructs the controller to send indication information to the user.
  • the authentication AP of the device sends a DHCP release message to the DHCP server by the authentication AP that triggers the user equipment, where the indication information includes the hardware address of the user equipment.
  • a second aspect of the present invention discloses an AP, including:
  • An obtaining unit configured to acquire an offline message for the user equipment, where the offline message carries a hardware address of the user equipment;
  • a sending unit configured to send a DHCP release message to the DHCP server, where the AP is an authentication AP of the user equipment, where the DHCP release message includes a hardware address of the user equipment.
  • the acquiring unit is specifically configured to receive a offline message sent by the user equipment
  • the sending unit is further configured to send a roaming information acquisition request for the user equipment to the controller, to trigger the controller to determine whether the AP is an authentication AP of the user equipment;
  • the obtaining unit is further configured to receive a determination result sent by the controller, and when the determining result is that the AP is an authentication AP of the user equipment, triggering, by the sending unit, performing the dynamic host configuration
  • the protocol server sends a dynamic host configuration protocol to release the message.
  • the acquiring unit is specifically configured to receive, by the controller, an offline message for the user equipment, where the offline message is further carried There is a reason for the user equipment to go offline;
  • the AP further includes:
  • a determining unit configured to determine, according to the offline reason of the user equipment acquired by the acquiring unit, whether the AP is an authentication AP of the user equipment, and when the determining result of the determining unit is yes, triggering the sending
  • the unit performs the step of sending a dynamic host configuration protocol release message to the dynamic host configuration protocol server.
  • the sending unit is further used And sending, in the case that the AP is not an authentication AP of the user equipment, a DHCP release message generation request to the controller, where the DHCP release message generation request instructs the controller to send indication information to the user equipment.
  • the authentication AP sends a DHCP release message to the DHCP server, and the indication information includes a hardware address of the user equipment.
  • a third aspect of the present invention discloses an address resource release system, including an AP and a DHCP server, wherein:
  • the AP is configured to obtain a downlink message for the user equipment, and if the AP is an authentication AP of the user equipment, send a DHCP release message to the DHCP server, where the offline message carries a hardware address of the user equipment, where the DHCP release message includes a hardware address of the user equipment;
  • the DHCP server is configured to receive the DHCP release message sent by the AP, and release an association between the IP address of the user equipment and the user equipment according to the DHCP release message.
  • the system further includes a controller and an authentication AP of the user equipment, where:
  • the AP is further configured to send a DHCP release message generation request to the controller.
  • the controller is configured to receive the DHCP release packet generation request sent by the AP, and send an indication information to the authentication AP of the user equipment according to the DHCP release packet generation request, where the indication information carries The hardware address of the user equipment;
  • the authentication AP of the user equipment is configured to receive the indication information sent by the controller, and send a DHCP release message to the DHCP server.
  • the DHCP server is further configured to receive the DHCP release message sent by the authentication AP of the user equipment.
  • the AP determines whether the AP is the authentication AP of the user equipment. If the AP is the authentication AP of the user equipment, the AP generates and sends a DHCP release message to the DHCP server. The triggering DHCP server releases the association between the IP address of the user equipment and the user equipment. In the embodiment of the present invention, after the user equipment goes offline, the DHCP server will release the IP address assigned to the user equipment, and the IP address becomes an unassigned IP address. When a new user equipment applies for an IP address, the DHCP server will This IP address is assigned to the new user equipment, so address resources can be saved.
  • FIG. 1 is a flowchart of a method for releasing an address resource according to an embodiment of the present invention
  • FIG. 2 is a flowchart of another address resource release method according to an embodiment of the present invention.
  • FIG. 3 is a structural diagram of an AP according to an embodiment of the present invention.
  • FIG. 4 is a structural diagram of another AP disclosed in an embodiment of the present invention.
  • FIG. 5 is a structural diagram of an address resource release system according to an embodiment of the present invention.
  • the invention discloses an address resource release method, device and system for saving address resources. The details are described below separately.
  • FIG. 1 is a flowchart of a method for releasing an address resource according to an embodiment of the present invention. As shown in FIG. 1, the address resource release method may include the following steps.
  • the AP acquires an offline message for the user equipment, where the offline message carries a hardware address of the user equipment.
  • the user equipment's offline message is sent by the user equipment to the AP.
  • the administrator lets the user equipment go offline and the user equipment costs are completed, the user equipment's offline message is sent by the controller. Give the AP.
  • the offline message sent to the AP carries the hardware address of the user equipment.
  • the hardware address of the user equipment is medium access control (English: media) Access control, abbreviation: MAC) address.
  • the AP In the case that the AP is an authentication AP of the user equipment, the AP sends a DHCP release message to the DHCP server, so that the DHCP server is configured to release the association between the IP address of the user equipment and the user equipment, where the DHCP release message includes the user.
  • the hardware address of the device In the case that the AP is an authentication AP of the user equipment, the AP sends a DHCP release message to the DHCP server, so that the DHCP server is configured to release the association between the IP address of the user equipment and the user equipment, where the DHCP release message includes the user.
  • the hardware address of the device In the case that the AP is an authentication AP of the user equipment, the AP sends a DHCP release message to the DHCP server, so that the DHCP server is configured to release the association between the IP address of the user equipment and the user equipment, where the DHCP release message includes the user.
  • the hardware address of the device In the case that the AP is
  • the AP determines whether the AP and the authentication AP of the user equipment are the same AP. If the AP is an authenticated AP of the user equipment, it indicates that the user equipment does not roam after the online authentication.
  • the user equipment accesses the network through the AP.
  • the AP generates a DHCP release (English: DHCP RELEASE) packet and releases the DHCP.
  • the packet is sent to the DHCP server to trigger the DHCP server to release the association between the IP address of the user equipment and the user equipment according to the DHCP release message of the user equipment.
  • the AP if the AP is not the authentication AP of the user equipment, it indicates that the user equipment roams from the authentication AP of the user equipment to the AP after the user equipment is authenticated, the AP sends a DHCP release message generation request to the controller, and the controller sends the indication information to the controller.
  • the authentication AP of the user equipment generates a DHCP release message by the authentication AP that triggers the user equipment, and the authentication AP of the user equipment sends the DHCP release message to the DHCP server.
  • the indication information includes the hardware address of the user equipment, and the authentication AP of the user equipment carries the hardware address of the user equipment in the DHCP release message sent by the user equipment according to the hardware address of the user equipment.
  • the AP sends a DHCP release message to the DHCP server to trigger the DHCP server to release the AP when the AP is the authentication AP of the user equipment.
  • the association between the IP address of the user device and the user device In the embodiment of the present invention, after the user equipment goes offline, the DHCP server will release the IP address assigned to the user equipment, and the IP address becomes an unassigned IP address. When a new user equipment applies for an IP address, the DHCP server will This IP address is assigned to the new user equipment, so address resources can be saved.
  • FIG. 2 is a flowchart of another address resource release method according to an embodiment of the present invention. As shown in FIG. 2, the address resource release method may include the following steps.
  • the AP forwards the IP address of the user equipment to the DHCP server to trigger the DHCP server to allocate an IP address to the user equipment.
  • the IP address acquisition request carries the hardware address of the user equipment.
  • the AP when the AP receives the authentication request sent by the user equipment, it indicates that the user equipment needs to access the network, and therefore sends an IP address acquisition request to the DHCP server to trigger the DHCP server to allocate an IP address to the user equipment, and allocate the IP address.
  • the address is sent to the AP.
  • the IP address acquisition request carries the hardware address of the user equipment, so that the DHCP server allocates an IP address to the user equipment.
  • the AP obtains an IP address allocated by the DHCP server for the user equipment, and generates a DHCP entry of the user equipment.
  • the AP After forwarding the IP address acquisition request to the DHCP server, the AP receives an IP address allocation response sent by the DHCP server, where the IP address allocation response includes the IP address of the user equipment. The AP then generates a DHCP entry for the user equipment.
  • the DHCP entry of the user equipment includes the mapping between the IP address of the user equipment and the hardware address.
  • the AP acquires an offline message for the user equipment, where the offline message carries a hardware address of the user equipment.
  • the AP acquiring the offline message for the user equipment may be an offline message sent by the AP to the user equipment, where the offline message carries the hardware address of the user equipment, or may be sent by the AP receiving controller.
  • the offline message carries the hardware address of the user equipment and the reason for the user equipment going offline.
  • the user equipment's offline message is sent by the user equipment to the AP; when the administrator lets the user equipment go offline, the user equipment's cost is completed, and so on, the user equipment's offline message It is sent to the AP by the controller.
  • the DHCP release packet may pass through other devices during the process of sending the DHCP release packet to the DHCP server. If DHCP snooping is used on these devices, DHCP snooping monitors whether the port that sends the DHCP release packet is the same as the port in the DHCP snooping table. If the packets are inconsistent, the packet is invalid. Message. Therefore, in order to make the forwarding path of the DHCP release packet consistent with the path of the DHCP packet in the IP address allocation process, the AP needs to determine whether the AP is the authentication AP of the user equipment after receiving the offline message sent by the user equipment.
  • the AP may determine whether the AP is the authentication AP of the user equipment, and may include the following steps.
  • A1 The AP sends a roaming information acquisition request to the user equipment to trigger the controller to determine whether the AP is an authentication AP of the user equipment, and sends the judgment result to the AP.
  • the offline message is sent by the user equipment to the AP. If the AP does not store information about whether the AP is the authentication AP of the user equipment, the AP sends a roaming information acquisition request to the controller to trigger the controller to determine whether the AP determines whether the AP is It is the authentication AP of the user equipment and sends the judgment result to the AP.
  • the AP receives the judgment result sent by the controller.
  • the AP After sending the roaming information acquisition request for the user equipment to the controller, the AP receives the judgment result sent by the controller, and identifies whether the judgment result is that the AP is the authentication AP of the user equipment.
  • the AP determines whether the AP is the authentication AP of the user equipment according to the offline reason of the user equipment.
  • the offline message when the offline message is sent by the controller to the AP, the offline message carries the reason for the downlink of the user equipment.
  • the downlink of the user equipment includes the direct offline and the roaming offline.
  • the direct offline is that the user equipment accesses the network through the AP from the authentication to the offline.
  • the AP is the authentication AP of the user equipment.
  • the authentication AP authenticates, and the user equipment does not access the network through the authentication AP but the AP accesses the network, that is, the user equipment roams from the authentication AP to the AP. Therefore, whether the AP is an authenticated AP of the user equipment can be determined according to the reason for the downlink of the user equipment.
  • the AP is the user equipment authentication in the same manner as the AP receives the offline message sent by the user equipment. AP.
  • the AP sends a DHCP release message to the DHCP server to trigger the DHCP server to release the association between the IP address of the user equipment and the user equipment.
  • the DHCP release message includes the user equipment. Hardware address.
  • the AP If the AP is an authenticated AP of the user equipment, it indicates that the user equipment does not roam after the online authentication.
  • the user equipment accesses the network through the AP.
  • the AP generates a DHCP release (English: DHCP RELEASE) packet and releases the DHCP.
  • the packet is sent to the DHCP server to trigger the DHCP server to release the association between the IP address of the user equipment and the user equipment according to the DHCP release message of the user equipment.
  • the AP if the AP is not the authentication AP of the user equipment, the AP sends a DHCP release message generation request to the controller, and the controller sends the indication information to the authentication AP of the user equipment to trigger the authentication AP of the user equipment.
  • a DHCP release message is generated, and the DHCP release message is sent by the authentication AP of the user equipment to the DHCP server.
  • the indication information includes the hardware address of the user equipment.
  • the AP if the AP is not the authentication AP of the user equipment, it indicates that the user equipment is authenticated to the DHCP relay agent after the user equipment is authenticated and the DHCP relay packet is not discarded.
  • the AP cannot directly send a DHCP release packet to the authentication device of the user equipment. Therefore, the AP sends a DHCP release packet generation request to the controller.
  • the controller sends the indication information to the user equipment according to the DHCP release packet generation request.
  • the authentication AP is configured to trigger the authentication of the user equipment to generate a DHCP release message, and the authentication AP of the user equipment sends the DHCP release message to the DHCP server to trigger the DHCP server to release the association between the IP address of the user equipment and the user equipment.
  • the indication information carries the hardware address of the user equipment, and the authentication AP carries the hardware address of the user equipment in the DHCP release message sent by the user equipment according to the hardware address of the user equipment in the indication information.
  • the DHCP release message is generated according to the DHCP entry of the user equipment, and the DHCP release message includes the hardware address and the IP address of the user equipment.
  • the AP clears the DHCP entry of the stored user equipment.
  • the AP forwards the IP address acquisition request of the user equipment to the DHCP server to trigger the DHCP server to allocate an IP address to the user equipment, obtain an offline message for the user equipment, and determine whether the AP is a user.
  • the authentication AP of the device sends a DHCP release message to the DHCP server to trigger the DHCP server to release the association between the IP address of the user equipment and the user equipment.
  • the DHCP server will release the IP address assigned to the user equipment, and the IP address becomes an unassigned IP address.
  • the DHCP server will This IP address is assigned to the new user equipment, so address resources can be saved.
  • FIG. 3 is a structural diagram of an AP according to an embodiment of the present invention.
  • the AP may include:
  • the obtaining unit 301 is configured to acquire a downlink message for the user equipment, where the offline message carries a hardware address of the user equipment;
  • the sending unit 302 is configured to send a DHCP release message to the DHCP server when the AP is the authentication AP of the user equipment, to trigger the DHCP server to release the association between the IP address of the user equipment and the user equipment, the DHCP release message. Includes the hardware address of the user device.
  • the obtaining unit 301 is specifically configured to receive an offline message sent by the user equipment.
  • the sending unit 302 is further configured to send a roaming information acquisition request for the user equipment to the controller, to trigger the controller to determine whether the AP is an authentication AP of the user equipment;
  • the obtaining unit 301 is further configured to receive a determination result sent by the controller.
  • the obtaining unit 301 is specifically configured to receive a downlink message sent by the controller for the user equipment, where the offline message further carries a downlink reason of the user equipment;
  • the AP can also include:
  • the determining unit is configured to determine, according to the offline reason of the user equipment acquired by the obtaining unit 301, whether the AP is an authentication AP of the user equipment.
  • the sending unit 302 is further configured to: when the AP is not the authentication AP of the user equipment, send a DHCP release message generation request to the controller, where the controller sends the indication information to the authentication AP of the user equipment.
  • the authentication AP that triggers the user equipment generates a DHCP release message
  • the authentication AP of the user equipment sends the DHCP release message to the DHCP server, where the indication information includes the hardware address of the user equipment.
  • the DHCP server releases the IP address assigned to the user equipment, and the IP address becomes an unassigned IP address.
  • the DHCP server assigns the IP address to the new user equipment, so address resources can be saved.
  • FIG. 4 is a structural diagram of another AP according to an embodiment of the present invention.
  • the AP may include a radio frequency (English: radio frequency, abbreviation: RF) module 401, a processor 402, a memory 403, and an Ethernet network interface controller 404.
  • RF module 401, processor 402, memory 403, and Ethernet network interface controller 404 may be connected by a bus.
  • the RF module 401 can support wireless communication of one or more frequency bands of 2.4 gigahertz (English: gigahertz, symbol: GHz), 3.6 GHz, 5 GHz, 60 GHz.
  • the processor 402 can be a central processing unit (English: central processing unit, abbreviated: CPU), or a combination of a CPU and a hardware chip.
  • the memory 403 may be a volatile memory (English: volatile memory), such as random access memory (English: random-access memory, abbreviation: RAM); or non-volatile memory (English: non-volatile memory), for example only Read memory (English: read-only memory, abbreviation: ROM), flash memory (English: flash memory), hard disk (English: hard disk drive, abbreviation: HDD) or solid state drive (English: solid-state drive, abbreviation: SSD); or any combination of the above types of memory.
  • a set of program codes is stored in the memory 403, and the processor 402 is configured to call the program code stored in the memory 403 to perform the following operations:
  • the DHCP release message is sent to the DHCP server, so that the DHCP server is released to release the association between the IP address of the user equipment and the user equipment, where the DHCP release message includes the hardware address of the user equipment.
  • the manner in which the processor 403 obtains the offline message for the user equipment is specifically:
  • the processor 403 After obtaining the offline message for the user equipment and sending the DHCP release message to the DHCP server, the processor 403 also performs the following operations:
  • the manner in which the processor 403 obtains the offline message for the user equipment is specifically:
  • the processor 403 After obtaining the offline message for the user equipment and sending the DHCP release message to the DHCP server, the processor 403 also performs the following operations:
  • the AP determines whether the AP is the authentication AP of the user equipment according to the offline condition of the user equipment.
  • the processor 403 further performs the following steps:
  • the AP sends a DHCP release message generation request controller, and the controller sends the indication information to the authentication AP of the user equipment to trigger the authentication AP of the user equipment to generate a DHCP release message, and
  • the DHCP release message is sent to the DHCP server by the authentication AP of the user equipment, and the indication information includes the hardware address of the user equipment.
  • the DHCP server releases the IP address assigned to the user equipment, and the IP address becomes an unassigned IP address.
  • the DHCP server assigns the IP address to the new user equipment, so address resources can be saved.
  • FIG. 5 is a structural diagram of an address resource release system according to an embodiment of the present invention.
  • the address resource release system may include an AP 501 and a DHCP server 502.
  • the structure of the AP 501 may be the same as that shown in FIG. 3 and FIG. 4, and details are not described herein. among them:
  • the AP 501 is configured to obtain a downlink message for the user equipment, and if the AP 501 is an authentication AP of the user equipment, generate and send a DHCP release message to the DHCP server 502, where the offline message carries the user equipment.
  • Hardware address, the DHCP release message includes a hardware address of the user equipment;
  • the DHCP server 502 is configured to receive the DHCP release message sent by the AP 501, and release the association between the IP address of the user equipment and the user equipment according to the DHCP release message.
  • the address resource release system may further include the controller 503 and the authentication AP 504 of the user equipment, where:
  • the AP 501 is further configured to send a DHCP release message generation request to the controller 503.
  • the controller 503 is configured to receive the DHCP release message generation request sent by the AP 501, and send the indication information to the authentication AP 504 of the user equipment, where the indication information carries the hardware address of the user equipment;
  • the authentication device AP504 of the user equipment is configured to receive the indication information sent by the controller 503, generate a DHCP release message, and send the DHCP release message to the DHCP server 502.
  • the DHCP server 502 is further configured to receive the DHCP release message sent by the authentication AP 504 of the user equipment, and release the message according to the dynamic host configuration protocol to release the association between the IP address of the user equipment and the user equipment.
  • the DHCP server releases the IP address assigned to the user equipment, and the IP address becomes an unassigned IP address.
  • the DHCP server assigns the IP address to the new user equipment, thus saving address resources.
  • an embodiment of the present invention further discloses a computer storage medium storing a computer program.
  • the computer program in the computer storage medium is read into a computer, the computer can cause the computer to complete the disclosure of the embodiment of the present invention. The entire steps of the address resource release method.
  • a person skilled in the art can understand that all or part of the various methods of the above embodiments can be completed by a program instruction processor, and the program can be stored in a computer readable storage medium, and the storage medium can include: Disk, read-only memory, random access device, disk or optical disk, etc.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention concerne un procédé, un appareil et un système de libération de ressource d'adresse. Le procédé comprend les opérations suivantes : un point d'accès sans fil obtient un message hors ligne pour un équipement utilisateur, le message hors ligne véhiculant une adresse matérielle de l'équipement utilisateur ; et dans un cas dans lequel le point d'accès sans fil est un point d'accès sans fil authentifié de l'équipement utilisateur, le point d'accès sans fil envoie un paquet de libération de protocole de configuration d'hôte dynamique à un serveur de protocole de configuration d'hôte dynamique, le paquet de libération de protocole de configuration d'hôte dynamique comprenant l'adresse matérielle de l'équipement utilisateur. Par mise en œuvre de modes de réalisation de la présente invention, des ressources d'adresse peuvent être économisées.
PCT/CN2015/074760 2014-03-29 2015-03-20 Procédé, appareil et système de libération de ressource d'adresse WO2015149635A1 (fr)

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CN201410124486.XA CN104955025B (zh) 2014-03-29 2014-03-29 一种地址资源释放方法及装置、系统

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WO2022037326A1 (fr) * 2020-08-20 2022-02-24 华为技术有限公司 Procédé de gestion d'accès, point d'authentification et serveur d'authentification

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CN101730090A (zh) * 2009-12-24 2010-06-09 杭州华三通信技术有限公司 Dhcp服务器释放ip地址的方法及设备
CN101795449A (zh) * 2010-01-07 2010-08-04 杭州华三通信技术有限公司 一种无线网络中终端的接入控制方法和设备

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