本文主要叙述了我们所提出的建立在Ethernet数据链路层基础之上的网络层和传输层通信协议。由于程序设计语言“C”具有字位处理、循环移位等功能,它对于书写网络协议处理程序非常方便,我们用“C”语言编写了协议处理程序,并在UNIX操作系统环境下实现了所提出的协议。 该协议具有通用性好,便于实现和扩充,并具有便于移植的特点。附录中提供了全部子程序的名称和框图。 This article describes our proposed network layer and transport layer protocol based on the Ethernet data link layer. Because programming language “C” has such functions as word-bit processing, cyclic shift, etc., it is very convenient for writing network protocol processing programs. We have written the protocol processing program in “C” language and implemented it in the UNIX operating system environment Proposed agreement. The agreement has versatility, easy to implement and expand, and has the characteristics of easy to transplant. The appendix provides the names and block diagrams of all subroutines.