采用P4的数据平面NAT-DP技术方案

针对协议转换（network address translation protocol translation，NAT PT）技术服务于 IPv4和IPv6节点之间的通信，无法实现多协议节点之间的数据包通信，缺乏协议扩展功能的问题，提出一种基于P4的网络地址 可编程数据平面协议转换（network address translation programmable data plane protocol translation，NAT DP）技术方案。该方案运用可编程协议无关报文处理语言完成解析器、控制流和匹配动作表的定义，实现多协议数据包在数据平面的解析、协议转换与重组。实验结果表明，该技术方案可以有效解决NAT PT的协议扩展性问题，并使管理员在数据平面实现协议转换机制的可重配置。

P4 Based Data Plane NAT DP Technical Solution

Aiming at solving a problem in the protocol conversion technology(network address translation protocol translation,NAT PT) serving the communication between IPv4 and IPv6 nodes that the data packet communication between multi protocol nodes cannot be realized nor the protocol extension function played,this article proposes a network address translation programmable data plane protocol translation(NAT DP).The programming protocol independent packet processors(P4) is used to define the parser,control flow,and matching action table to realize the analysis,protocol conversion,and reorganization of multi protocol packets in the data plane.The experimental results show that the NAT DP technology can effectively solve the problem in protocol scalability of NAT PT and enable the administrator to realize the reconfiguration of the protocol conversion mechanism in the data plane.