Method and device of relaying in configuration procedue of dynamic host address

A technology of address configuration and dynamic host, applied in the Internet field, can solve problems such as low efficiency and affecting normal terminal network communication

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

Furthermore, in order to prevent illegal DHCP servers from assigning IP addresses, if the method of manual search is adopted, the efficiency is too low; if the method of manual search is not adopted, and the method of prohibiting network communication of physical ports is adopted, it will affect the network communication of normal terminals
Existing technology cannot solve this contradiction

Method used

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  • Method and device of relaying in configuration procedue of dynamic host address
  • Method and device of relaying in configuration procedue of dynamic host address
  • Method and device of relaying in configuration procedue of dynamic host address

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Embodiment Construction

[0034]The core idea of ​​the present invention is: the difference between the message sent when the DHCP server in the subnet is used to allocate IP addresses and the message sent when the DHCP server outside the subnet performs IP address allocation is determined by the switch located on the subnet switch. The DHCP relay agent analyzes all received packets for IP address assignment, and then uses the ACL of the switch to discard the packets for IP address assignment sent by illegal DHCP servers in the subnet.

[0035] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] Please refer to figure 1 , figure 1 It is a flow chart when the DHCP server assigns IP addresses.

[0037] figure 1 (a) is a flow chart of assigning IP addresses when the DHCP server and the DHCP client are located in th...

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PUM

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Abstract

The invention discloses a method for relaying in the dynamic host address configuration process. The legal dynamic host address configuration protocol DHCP server is located outside the subnet, and the illegal DHCP server is located in the subnet. The access control list ACL of the subnet switch is set, Make the subnet switch discard the DHCP message sent by the illegal DHCP server, including: A. According to the ACL, judge whether to discard the received DHCP message, if necessary, discard the message and end this process, otherwise perform step B ; B. Send the message to the DHCP client or legal DHCP server according to the source of the received DHCP message. The invention also provides a device for relaying in the dynamic host address configuration process. Adopting the technical solution provided by the present invention can prevent the illegal DHCP server from providing DHCP service externally, and will not affect other types of network communications performed by the terminal where the illegal DHCP server is located, and will not affect the network of other normal terminals in the subnet. communication.

Description

technical field [0001] The invention relates to Internet technology, in particular to a method for relaying during dynamic host address configuration. Background technique [0002] With the expansion of the network scale, the number of terminals in the subnet often exceeds the assignable Internet Protocol (Internet Protocol, IP) addresses. But the actual situation is that these terminals do not always need to occupy IP addresses. For example, when they are turned off or portable to other subnets, they will no longer occupy the IP addresses of the atomic network. Aiming at this situation, a common solution is to use Dynamic Host Configuration Protocol (Dynamic Host Configuration Protocol, DHCP) to dynamically allocate IP addresses. As a DHCP client, a terminal that needs to occupy an IP address dynamically requests configuration information from a DHCP server, and the DHCP server returns corresponding configuration information, including an IP address, according to a configu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/12H04L29/06
Inventor 邱元香
Owner NEW H3C TECH CO LTD
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