A communication method for switching the mobile node from IPv6 network to IPv4 network

Abstract

The related continual communication switch method from IPv6 to IPv4 network comprises: as both the local agent and communication node on IPv6 network, setting a NAT-PT gateway with DNS-ALG between the IPv6 and IPv4 network; when moving from IPv6 to IPv4 network, the node queries the IPv4 addresses of local agent and node distributed by NAT-PT gateway for next register and communication. Besides, this invention applies mobile option of Care-of Test message for convenient data calculation.

Description

technical field [0001] The invention relates to the communication field, in particular to a communication method for realizing the handover of a mobile node from an IPv6 network to an IPv4 network. Background technique [0002] With the development of network technology and the expansion of network scale, IPv4 (Internet Protocol version 4) can no longer meet the requirements of network development. As an alternative version of IPv4, IPv6 (Internet Protocol version 6) can provide a huge address space and has many new features that IPv4 does not have, and has received more and more attention. Due to the small number of IPv4 addresses in our country, the problem of address exhaustion is particularly prominent, and our country is vigorously promoting the research and development of IPv6. On the other hand, as people's demand for mobile communication increases day by day, the research on mobile communication has also reached an unprecedented height. [0003] In order to solve t...

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Problems solved by technology

[0033] However, the Mobile IPv6 protocol cannot be directly applied to the above-mentioned fourth situation, and there are two main problems: after the mobile node switches from the IPv6 network to the IPv4 network, the subsequent registration and communication processes are all carried out between heterogeneous networks. Address translation, that is, how to deal with the problem of address translation; and in the Return Routability Procedure, the mobile node needs to use its own IPv6 care-of address and the IPv6 address of the communication node when calculating some authentication data, but the IPv4 network It can only handle addresses in IPv4 format. The IP addresses of data packets sent from the IPv6 network to the IPv4 network are all converted into 32-bit IPv4 format IP addresses. Therefore, after the mobile node switches to the IPv4 network, it cannot pass the conventional method. Obtain the IPv6 address of the corresponding node and its care-of address in IPv6 form

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