路由设备IPv6网络隧道功能驱动研究  

Research on Function Drive of IPv6 Network Tunnel of Routing Equipment

作　　者：蒋建峰[1,2] JIANG Jian-feng(Suzhou Industrial Park Institute of Services Outsourcing,Suzhou 215123,China;School of Computer Science,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)

机构地区：[1]苏州工业园区服务外包职业学院,江苏苏州215123 [2]南京邮电大学计算机学院,江苏南京210003

出　　处：《计算机技术与发展》2022年第8期129-134,共6页Computer Technology and Development

基　　金：江苏省博士后研究基金(2018K009B);江苏省专业带头人高端研修项目(2020GRFX074);江苏省青蓝工程项目(202010)。

摘　　要：因特网的发展导致IP地址的资源耗尽,IPv6网络将逐渐取代IPv4网络的主体地位。IPv4网络向IPv6网络过渡过程中,出现了很多IPv6网络的孤岛,隧道技术是实现IPv6孤岛之间联通的关键过渡技术。IPv6隧道技术是将IPv6报文作为要发送给隧道另一端的IPv4报文的净荷数据,然后经由IPv4骨干网络传输。在网络数据的转发过程中,基于硬件的数据转发效率要远高于软件驱动的数据转发效率。依据IPv6隧道技术设计了一套驱动流程,指导隧道报文在转发芯片上的转发。介绍了系统结构图以及NP芯片的转发流程和驱动指令,基于三层单播转发将数据包在隧道中封装,在OUTINFO表项内添加隧道标记和信息,将各种指令信息下发NP芯片,生成FIB转发表指导数据转发方案。实验表明该驱动流程可以很好地指导6to4隧道报文正常转发,提高网络的数据转发速率,降低网络延迟,特别是当数据流量增大到300 Mbps以上时,网络延迟和抖动性能可以提升100%~400%,具有较强的实用性。The development of the Internet has led to the exhaustion of IP address resources,and IPv6 networks will gradually replace the dominant position of IPv4 networks.During the transition from the IPv4 network to the IPv6 network,many isolated islands of the IPv6 network have appeared,and the tunnel technology is the key transition technology to realize the connectivity between the IPv6 isolated islands.The IPv6 tunnel technology uses IPv6 packets as the payload data of the IPv4 packets to be sent to the other end of the tunnel,and then transmits them via the IPv4 backbone network.In the process of network data forwarding,hardware-based data forwarding efficiency is much higher than software-driven data forwarding efficiency.Based on the IPv6 tunnel technology,a set of driving procedures is designed to guide the forwarding of tunnel messages on the forwarding chip.In this study,we introduce the system structure diagram and the forwarding process and driving instructions of the NP chip.Based on the three-layer unicast forwarding,the data packet is encapsulated in the tunnel,the tunnel mark and information are added to the OUTINFO entry,and then various instruction information is issued to the NP chip to generate the FIB forwarding table to guide the data forwarding scheme.Experiments show that the driving process can well guide the normal forwarding of 6 to4 tunnel messages,increase the data forwarding rate of the network,and reduce network delay.When the data stream increases to more than 300 M,the network delay and jitter performance can be improved by 100%~400%.

关 键 词：隧道 6to4中继 NP芯片 驱动指令 转发信息库 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]