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Response method for free ARP request and gateway device thereof

An ARP request, gateway device technology, applied in the network field, can solve problems such as the failure of gratuitous ARP, affecting legitimate users to use the network, and achieve the effect of avoiding IP address conflicts

Active Publication Date: 2009-10-21
NEW H3C TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the gateway device broadcasts the gratuitous ARP of the gateway device to the outside, it will invalidate the gratuitous ARP sent by the monitoring device to the illegal user device. The reason is that the gratuitous ARP request sent by the monitoring device will be updated by the gratuitous ARP request sent by the gateway. The user equipment will continue to access the network according to the ARP entry of the correct gateway device
However, the method of only alerting the network administrator will affect the use of the network by legitimate users.

Method used

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  • Response method for free ARP request and gateway device thereof
  • Response method for free ARP request and gateway device thereof
  • Response method for free ARP request and gateway device thereof

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Embodiment Construction

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] The present invention provides a response method for gratuitous ARP request, such as image 3 shown, including:

[0044] Step 301: When the gateway device receives the gratuitous ARP request with the same IP address as the gateway device, it determines whether the source MAC address of the gratuitous ARP request is a trusted authorized MAC address.

[0045] Step 302: When the source MAC address is a trusted authorized MAC address,...

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Abstract

The invention discloses a response method for free ARP (address solution protocol) request and a gateway device for the application of the method. The method comprises the following steps: the gateway device, when receiving the free ARP request with the same IP address as the gateway device, determines whether the source MAC (media access control) address of the free ARP address is a dependable authorized MAC address; and if the source MAC address is the dependable authorized MAC address, the gateway device allows the free ARP request with the same IP address as the gateway device to be transmitted in the internet. By configuring the dependable authorized MAC address on the gateway device, the invention leads the gateway device to carry out corresponding processing when receiving the free ARP request with the same IP address as the gateway device according to whether the source MAC address of the free MAC request is the dependable authorized MAC address. The IP address conflict can be effectively avoided without impact on the monitoring to an illegal network device of a network monitoring device.

Description

technical field [0001] The present invention relates to the field of network technology, in particular to a method for responding to a gratuitous ARP request and a gateway device applying the method. Background technique [0002] In the network, the user equipment generally communicates with the equipment in the external network through the gateway device. A typical network diagram is as follows figure 1 shown. The user equipment obtains an ARP (Address Resolution Protocol, Address Resolution Protocol) entry of the gateway device in a certain way, and the ARP entry includes an IP (Internet Protocol, Internet Protocol) address and a MAC (Medium Access Control, media access) address of the gateway device control) address, and then the user equipment communicates with the equipment in the external network through the gateway equipment. [0003] There are usually some illegal user equipments in the network (for example, user equipments without payment), and it is necessary to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/24H04L29/06H04L12/66
Inventor 李海军孙强
Owner NEW H3C TECH CO LTD
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