Method for preventing MAC address cheat

A technology of MAC address and forwarding table items, applied in the field of data communication, can solve the problems of complex configuration, MAC address site does not notify CPU processing, etc., to achieve the effect of solving complex configuration

Inactive Publication Date: 2008-11-26
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0023] In view of the above, the method and device for preventing MAC address spoofing provided by the present invention solve the problem in the prior art that the MAC address of the uplink device needs to be known when configuring a static MAC address on the uplink port, and the configuration is complicated; The problem of not notifying the CPU for processing

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  • Method for preventing MAC address cheat
  • Method for preventing MAC address cheat
  • Method for preventing MAC address cheat

Examples

Experimental program
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Embodiment Construction

[0042] The invention sets the dynamic MAC address forwarding entry of the uplink port as static through the CPU system, and simulates the aging mechanism of the MAC address of the chip to perform aging processing on the MAC address forwarding entry whose port is the uplink port.

[0043] Since there is usually a HIT bit in each MAC address forwarding entry, it is used to indicate whether the entry is hit, that is, when the source MAC address and VLAN ID in the packet are the same as a MAC address forwarding entry , the HIT bit of the entry will be set.

[0044] The network switching chip will check the dynamic MAC address entry in the MAC address forwarding table according to the set aging time. If the HIT bit in the entry is set, the HIT bit will be cleared. After the HIT bit is cleared, if the When a packet with the same source MAC address and VLAN ID as the MAC address and VLAN ID of the table entry enters, the HIT bit of the table entry is reset; if the HIT bit has been re...

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Abstract

The disclosed method for preventing the cheat of MAC address comprises: CPU system sets the dynamic MAC address transmission list item on up port as static state, and simulates the aging mechanism of chip MAC address for former up port list item to prevent cheating MAC address. This invention can record user port suffered malevolent attack and the attack time to notify user through CPU system man-machine interface and network management system in time.

Description

technical field [0001] The invention relates to the field of data communication, in particular to a method for preventing MAC address spoofing. Background technique [0002] The IEEE802.3 standard stipulates that in a standard Ethernet MAC frame, there are destination MAC address and source MAC address, and the length is 6 bytes. figure 1 It is a standard Ethernet MAC frame format, where: [0003] Destination Address: destination MAC address, 6Bytes [0004] Source Address: source MAC address, 6Bytes [0005] Length / type: data length or message type, 2Bytes [0006] DATA: the data field carried by the Ethernet frame [0007] FCS: Frame Check Sequence [0008] The destination MAC address is used to identify which physical device the Ethernet frame is sent to, and the source MAC address is used to identify which physical device the Ethernet frame is sent from. The first bit of the destination MAC address (the lowest bit of the first byte) indicates whether the destinatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/24H04L12/56H04L29/06H04L9/00
Inventor 马书雷潘晶
Owner HUAWEI TECH CO LTD
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