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Method, device and system for assigning IP (Internet Protocol) address in wireless LAN (Local Area Network)

A wireless local area network, IP address technology, applied in the field of wireless communication, can solve the problems of DHCP flooding attacks, legitimate terminals cannot obtain IP addresses normally, and legitimate terminals cannot access the Internet, etc., so as to reduce malicious consumption and avoid flooding attacks. Effect

Active Publication Date: 2013-06-26
中国移动通信集团广西有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Embodiments of the present invention provide a method, device and system for allocating IP addresses in a wireless local area network, which are used to solve how to prevent malicious terminals from flooding attacks on DHCP, so that legitimate terminals cannot obtain IP addresses normally, causing legitimate terminals to pass through wireless The problem that the LAN cannot access the Internet

Method used

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  • Method, device and system for assigning IP (Internet Protocol) address in wireless LAN (Local Area Network)
  • Method, device and system for assigning IP (Internet Protocol) address in wireless LAN (Local Area Network)
  • Method, device and system for assigning IP (Internet Protocol) address in wireless LAN (Local Area Network)

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Experimental program
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Embodiment 1

[0034] Such as figure 2 As shown, it is a flow chart of a method for assigning an IP address in a wireless local area network in Embodiment 1, and the method includes:

[0035] Step 201: After receiving the IP address allocation request sent by the AP, determine the usage rate of the current IP address in the DHCP server.

[0036] In order to ensure that the available IP addresses in the IP resource pool of the DHCP server are not consumed by malicious terminals, when receiving the IP address allocation request sent by the AP, the usage rate of the current IP address in the DHCP server (that is, the number of IP addresses already allocated to the AP) is judged. The ratio of the total number of IP addresses in the IP resource pool of the DHCP server) to indicate the number of remaining available IP addresses in the current DHCP server, and provide a basis for whether to adopt a strict IP address allocation strategy.

[0037] In this step 201, there are many ways to determine ...

Embodiment 2

[0065] The second embodiment describes the solution of the first embodiment in detail with specific examples, as image 3 Shown is the schematic flow chart of the method of this embodiment two, and the method comprises:

[0066] Step 301: the wireless terminal initiates a request for accessing the wireless local area network to the AP.

[0067] Step 302: After receiving the request for accessing the wireless local area network, the AP sends a message through the switch, which includes an IP address assignment request.

[0068] Step 303: After receiving the message, judge whether it is a message sent by the wireless device according to the preset configuration information or default port information, and if so, perform step 304; otherwise, forward it directly.

[0069] Step 304: According to the control channel and the data channel, it is judged whether the type of the message belongs to a control message or a data message, and if it belongs to a control message, it is directl...

Embodiment 3

[0082] Such as Figure 4 As shown, it is a schematic structural diagram of a device for allocating IP addresses in a wireless local area network according to the third embodiment. The device includes: a receiving module 41 , a determining module 42 and an IP address allocating module 43 . in,

[0083] The receiving module 41 is used to receive the IP address allocation request sent by the AP; the determination module 42 is used to determine the utilization rate of the current IP address in the DHCP server; the IP address allocation module 43 is used to determine the corresponding IP address according to the determined utilization rate. The address allocation policy allocates IP addresses.

[0084]Specifically, the IP address assignment module 43 includes: a usage ratio judging submodule 44 , a first time number judging submodule 45 and an IP address assignment submodule 46 .

[0085] Utilization rate judging submodule 44, for judging whether the utilization rate of the curre...

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Abstract

The invention discloses a method, device and system for assigning an IP (Internet Protocol) address in a wireless LAN (Local Area Network). The method mainly comprises the steps of: after receiving an IP address assignment request sent by an AP (Access Point), determining a utilization rate of a current IP address of a DHCP (Dynamic Host Configuration Protocol) server, and then taking a strict IP address assignment strategy which matches the current utilization rate. Therefore, the method, device and system for assigning the IP address in the wireless LAN can prevent the DHCP server from being subjected to flooding attack, and reduce malicious consumption of IP addresses in the DHCP server.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method, device and system for allocating IP addresses in a wireless local area network. Background technique [0002] DHCP (Dynamic Configuration Protocol, Dynamic Host Configuration Protocol) is a network protocol in a local area network, which is used to automatically assign an IP (Internet Protocol, Internet Protocol) address to a terminal for an internal network or a network server provider. [0003] Due to the current limited IP address resources, broadband access operators cannot assign a fixed IP address to each terminal that has installed broadband, and two computers connected to the Internet must have their own IP address to communicate with each other. IP address, so the DHCP protocol is used to assign a temporary address to the terminal on the Internet, that is, before the terminal is connected to the Internet, the DHCP server needs to temporarily assign an IP a...

Claims

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Application Information

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IPC IPC(8): H04L29/12H04W8/26
Inventor 宁建创李悦莫晓斌袁兵陈励锋何秋萍
Owner 中国移动通信集团广西有限公司
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