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DHCP monitoring method and apparatus thereof

A monitoring method and a technology of a monitoring device, which are applied in the field of communication networks, can solve problems such as insufficient DHCPSnooping binding table space, limited DHCP binding table space, and failure to create normally.

Inactive Publication Date: 2009-06-10
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 1. Since a large number of users will be connected to a gateway, the space for storing the DHCP binding table is limited. Therefore, the DHCP binding table that has not been hit for a long time needs to be aged out, that is, the DHCP binding table is invalidated. Or the DHCP snooping binding table of a new user cannot be created normally due to insufficient space
[0012] 2. Due to the restart of the network device with the DHCP Snooping function enabled, the original DHCP binding table is partially lost during the process of saving and restoring
[0013] 3. The network device with the DHCP Snooping function enabled may also cause the loss of the DHCP binding table due to its own internal communication.
[0019] The above two methods will cause the user to interrupt the Internet, or even lose the message

Method used

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  • DHCP monitoring method and apparatus thereof
  • DHCP monitoring method and apparatus thereof
  • DHCP monitoring method and apparatus thereof

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Embodiment Construction

[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0038] figure 2 A schematic flow chart of Embodiment 1 of the DHCP monitoring method of the present invention is shown, which embodiment includes the following steps:

[0039] Step S2001: Receive a user message and judge whether it matches the DHCP binding table, if the judgment result is yes, forward the user message according to the prior art, otherwise, execute step S2002.

[0040] Step S2002: sending a DHCPNAK message to the user in the same manner as the DHCP server.

[0041] In this embodiment, when the user message fails to match the DHCP binding table, the message is no longer directly discarded as in the prior art. For example, if figure 1The access device shown in (the network switch in the figure) receives the packet of user B. Since the DHCP snooping function is enabled on the ingress port, the DHCP snooping unit of the access device extracts ...

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PUM

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Abstract

The invention discloses a DHCP monitoring method, which can transmit DHCPNAK messaage to the users modelled upon the DHCP server, and makes the users initate the first address application after receiving the DHCPNAK messaage when the received user message can not hit the DHCP binding cache due to the abnormal loss of the DHCP binding cache. The invention also discloses a DHCP monitoring device. According to the invention, the DHCP binding cache can be rebuilt without being aware of the user, therefor realizing a net surfing as usual.

Description

technical field [0001] The invention relates to the technical field of communication networks, in particular to a DHCP monitoring method and a device thereof. Background technique [0002] With the expansion of network scale and the improvement of network complexity, Dynamic Host Configuration Protocol (DynamicHost Configuration Protocol, DHCP) has been widely used. However, the DHCP protocol encounters many security problems in the application process. In order to solve these problems, the common way at present is to enable the DHCP snooping (Snooping) function at the network equipment of the access user, such as the gateway switch. [0003] The DHCP Snooping protocol stack establishes a DHCP binding table by monitoring the DHCP message, and the entries of the DHCP binding table include: IP address, MAC address, ingress port number and virtual local area network (Virtual LAN, VLAN) number. When forwarding the message, the DHCP binding table is used to check the address res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/26H04L12/28H04L1/16H04L29/06H04L12/56
CPCH04L61/2015H04L61/5014
Inventor 谭学飞
Owner HUAWEI TECH CO LTD