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Method for preventing IP address from leakage

An IP address and address technology, which is applied in the field of Internet technology and access network, can solve the problems of easy leakage of IP addresses, etc., and achieve the effects of reducing broadcast message transmission, saving network bandwidth resources, and increasing security

Active Publication Date: 2009-07-01
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0025] The technical problem to be solved by the present invention is to provide a method for preventing IP address leakage, which overcomes the disadvantage that the existing technology simply uses broadcast marks to determine the forwarding mode of DHCP messages by DHCP Relay, thus causing the IP address assigned by the DHCP server to be easily leaked

Method used

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  • Method for preventing IP address from leakage
  • Method for preventing IP address from leakage
  • Method for preventing IP address from leakage

Examples

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Embodiment Construction

[0052] Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

[0053] Main point of the present invention is when DHCP client (Dynamic Host Configuration Protocol client) and DHCPserver (Dynamic Host Configuration Protocol server) are not in an IP subnet, DHCP Relay (Dynamic Host Configuration Protocol relay equipment) or started DHCP Relay agent ( The DSLAM of the Dynamic Host Configuration Protocol relay agent) service records the MAC address of the DHCP client according to the DHCPDISCOVER / REQUEST message sent by the DHCP client, and records the user port address sending the message when receiving the DISCOVER / REQUESTIP message; then establishes The corresponding relationship between the MAC address and the user port address, after receiving the response message sent by the DHCP server, the DHCP Relay or DSLAM device finds the MAC address according to the chaddr field in the DHCP message; according to the correspo...

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Abstract

The invention discloses a method for preventing an IP address from being leaked, which comprises the following steps: recording a user port address for sending a message after a DHCP Relay acquires the DHCP message transmitted by a DHCP client; searching the MAC address of the DHCP client from the client hardware address field of the message; establishing corresponding relation between the MAC address and the user port address; searching the MAC address by using the DHCP Relay according to a client hardware address field in a response message after the response message transmitted by a DHCP server is received; searching the corresponding user port address according to the corresponding relation between the MAC address and the user port address; and then directly sending the response message to a user port determined by the user port address. The technical scheme provided by the invention effectively prevents the interception of a user, enhances the application safety of a DHCP protocol, simultaneously reduces the broadcast message transmission of a two-layer network, and saving the network bandwidth resources.

Description

technical field [0001] The invention relates to the technical field of Internet (Internet) and the technical field of access network, in particular to a method for preventing IP address leakage. Background technique [0002] Dynamic Host Configuration Protocol (DHCP, Dynamic Host Configuration Protocol) is a terminal automatic configuration protocol, and RFC2131, 2132, and 1542 provide its implementation standards. The DHCP protocol is implemented in a client-server manner. The DHCP protocol is an application based on the UDP layer. The DHCP terminal (also called the DHCP client, DHCP client) is identified by the well-known port number 68, and the DHCP server (DHCP server) is identified by the well-known port number 68. Port number 67 for identification. The DHCP protocol can support a variety of terminal devices, and the entire configuration process is automatically realized, and the terminal does not need to be configured, which can achieve the goal of users being able to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/12H04L12/24H04L12/56H04L45/74
Inventor 邓雄袁远
Owner HUAWEI TECH CO LTD
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