车载网络IPv6隧道的设计与实现

摘要

为了解决车载网关中异构网络与互联网的通信问题,设计了一种基于Linux虚拟设备的隧道,该隧道能实现IPv6数据包穿越NAT和CDMA的IPv4网络,并与车载异构网络互联.同时利用Linux中的模块动态加载特性及虚拟网络设备来灵活配置隧道参数,从模型层次上,在TCP/IP协议栈的网络层和物理设备驱动层之间设计了一个虚拟网络设备,所有的IPv6数据包在发送和接收之前均被本网络设备截获,并进行协议封装和解析.实验结果表明,该隧道可以高效稳定地使IPv6客户端穿越无线链路的IPv4网络,并与IPv6服务器端进行通信.%In the sake of solving the communication issue on the connection between heterogeneous networks in in-vehicle gateway and Internet, a tunnel is implemented based on Linux virtual device. It is possible for IPv6 data packages to traverse IPv4 network with NAT and CDMA, communicating with the heterogeneous network in vehicle. With the characteristic of Linux dynamic module loading, the virtual device module can configure parameter of tunnel flexibly. A virtual network module is designed between TCP/IP protocol stack and real device driver layer. All the IPv6 packages coming to and from will be hooked by this kernel module which will encapsulate and resolve the IPv6 package with another protocol. Experiment indicated this new tunnel mechanism can accomplish the task that IPv6 client can traverse IPv4 wireless network to communicate IPv6 server on corresponding side stably and effectively.