Dynamic IP address allocation method, system, mobile node, and access point

A technology of IP address and dynamic allocation, applied in the field of mobile nodes, access points, and dynamic distribution of IP addresses, which can solve the problems of reducing DHCP interaction primitives and not proposing IP address solutions

Active Publication Date: 2008-07-02
LENOVO (BEIJING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Visible, with figure 1 Compared with the IP address dynamic allocation method shown, this method only reduces the DHCP interaction primitives, and after the MN and the AP are successfully associated, the DHCP request and allocation phases still nee

Method used

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  • Dynamic IP address allocation method, system, mobile node, and access point
  • Dynamic IP address allocation method, system, mobile node, and access point
  • Dynamic IP address allocation method, system, mobile node, and access point

Examples

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Embodiment Construction

[0080] The design idea of ​​the present invention is: firstly, the AP, as a DHCP client, applies for and stores several IP addresses from the DHCP server on behalf of the switching node in advance, and when the MN applies for an IP address across the network, the AP directly sends the stored IP address to the MN.

[0081] The present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0082] An IP address linked list IP_Table is established in the AP, and the AP represents the mobile node handed over across the network to apply for several IP addresses from the DHCP server in advance, and save them in the IP address linked list IP_Table. The implementation steps are as follows:

[0083] Step 201, the AP broadcasts a DHCPDiscover message;

[0084] Step 202, all DHCP servers that receive the DHCPDiscover message send a DHCPOffer message containing information such a...

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PUM

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Abstract

The invention discloses a method for distributing IP addresses dynamically when a mobile node carries out cross network switching. The method comprises the following steps: (a) a re-association request containing a request for distributing IP address information is sent to an accessing point waiting for connection by the mobile node; (b) an IP address which can be distributed is determined from the IP addresses which are applied and stored beforehand after the re-association request is received by the accessing point waiting for connection; association response of the determined IP addresses information is sent to the mobile node; (c) the IP addresses information in the received association response is taken out by the mobile mode to carry out IP address configuration. The invention also discloses a system for distributing IP addresses dynamically and a mobile node and an accessing point thereof. The invention can allow the IP address to be obtained quickly when the mobile node carries out cross network switching.

Description

technical field [0001] The present invention relates to a method and system for allocating Internet Protocol (Internet Protocol, IP) addresses, in particular to a method and system for dynamically distributing IP addresses in a wireless network, as well as mobile nodes (Mobile Node, MN), access points (Access Point, AP). Background technique [0002] In the wireless Internet network, each mobile node (Mobile Node, MN) is assigned a persistent IP address (home address), and when the MN roams to a foreign network, in order to access the foreign network, it must be assigned to the A temporary IP address of the MN, which is called a care-of address in the Mobile IP protocol. According to the requirements of RFC2131, when the MN and the access point (Access Point, AP) establish an association (Associate), the Dynamic Host Configuration Protocol (Dynamic Host Configuration Protocol, DHCP) server allocates an IP address for each roaming mobile node MN , its flow chart is as figu...

Claims

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Application Information

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IPC IPC(8): H04L29/06H04Q7/38
Inventor 杨仁忠吴功伟柴东岩
Owner LENOVO (BEIJING) CO LTD
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