A method, system and device for establishing ARP table items

A technology of ARP entries and IP addresses, applied in transmission systems, electrical components, etc., can solve problems such as the inability to send messages to the gateway, and the inability to communicate between AP and AC, and achieve the effect of preventing malicious ARP spoofing attacks

Active Publication Date: 2010-10-27
HEWLETT-PACKARD ENTERPRISE DEV LP
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Problems solved by technology

[0004] However, in the method of the above-mentioned prior art, if a malicious ARP spoofing attack occurs in the network, that is, when the IP address of the gateway is faked to send an ARP message containing a false MAC address to the AP, the AP will learn the false MAC address and use The false MAC address sets or updates the ARP entry. At this time, the ARP entry prevents the AP from sending packets to the gateway, thus causing the AP and AC to fail to communicate.

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  • A method, system and device for establishing ARP table items
  • A method, system and device for establishing ARP table items
  • A method, system and device for establishing ARP table items

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[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] The method provided by the present invention mainly includes: after the DHCP server receives the AP's network information request, it sends the pre-configured gateway IP address and gateway MAC address information to the AP; the AP uses the received gateway IP address and gateway MAC address information to set the static ARP entry.

[0036] The above-mentioned method is described with a specific embodiment below, figure 2 The flow chart of the method provided for the embodiment of the present invention, in this embodiment, the gateway IP address and the gateway MAC address are pre-configured on the DHCP server, usually the gateway IP address and the mapping relationship between the IP address and the MAC address can be configured The way....

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Abstract

The invention provides a method, a system and a device used for establishing an ARP table, wherein, the method comprises that after receiving a network information request of an AP, a DHCP server sends a gateway IP address and information of a gateway MAC address that are configured in advance to the AP; the AP sets a static ARP table by utilizing the received gateway IP address and the information of the gateway MAC address, namely, the AP not only obtains the gateway IP address from the DHCP server, but also obtains the gateway MAC address corresponding to the gateway IP address and sets the gateway IP address and the information of the gateway MAC address into the static ARP table; the ARP table is not renewed and aged during the subsequent study of MAC address, thereby avoiding spiteful passing-off ARP attacks.

Description

technical field [0001] The present invention relates to mobile communication technology, in particular to a method, system and device for establishing ARP entries. Background technique [0002] With the development of wireless local area network (WLAN, Wireless Local Area Network) technology, the centralized management of WLAN has been applied more and more. A centrally managed WLAN is mainly composed of an access point (AP, Access Point) and an access controller (AC, Access Controller). The AC manages multiple APs to jointly provide WLAN access services. A mobile terminal can access a WLAN within the coverage of any AP. [0003] When the AP and AC are isolated by a Layer 3 network, the networking structure is as follows: figure 1 As shown, all packets sent by the AP to the AC need to be forwarded by the gateway. Since the AP is a zero-configuration device, the AP needs to obtain network information such as the gateway's IP address and MAC address before establishing a con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/12H04L29/06
Inventor 赵玉金张海涛王飓宋渊
Owner HEWLETT-PACKARD ENTERPRISE DEV LP
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