The Design and Implementation of the 4.4BSD Operating System

Chapter 13Network Protocols

Chapter 12 presented the network-communications architecture of 4.4BSD. In this chapter, we examine the network protocols implemented within this framework. The 4.4BSD system supports four major communication domains: DARPA Internet, Xerox Network Systems (NS), ISO/OSI, and local domain (formerly known as the UNIX domain). The local domain does not include network protocols because it operates entirely within a single system. The Internet protocol suite was the first set of protocols implemented within the network architecture of 4.2BSD. Following the release of 4.2BSD, several proprietary protocol families were implemented by vendors within the network architecture. However, it was not until the addition of the Xerox ...