Overview

The networking functionality in Digital UNIX Version 4.0 comes primarily from OSF Version 1.0, although certain modules, like System V Release 4.0 STREAMS which were not available in OSF Version 1.0, have been taken from the OSF Version 1.2 code base. Some functionality, like IP Multicasting and the packet filter applications, has been taken from the public domain, enhanced, and integrated into the operating system as a service to our customers. The Network File System (NFS) code, as well as the Remote Procedure Calling (RPC) code, Network Information Service (NIS), and remote daemons and their corresponding commands came from Sun Microsystem's Open Network Computing (ONC) Version 4.2. And finally, functionality that Digital has licensed and enhanced, like Yellow Pages/Network Information Service which was licensed from SUN, was ported to Digital UNIX Version 4.0 from ULTRIX, since, although conforming to the OSF Version 1.2 standards, it was determined to be more robust than the corresponding code from the OSF.

Like all subsystems in Digital UNIX Version 4.0, the networking subsystem is designed to provide a standardized programming interface to enable third-party vendors to develop and port their networking applications to OSF with a minimum of difficulty. To this end Digital UNIX Version 4.0 supports the following:

• Internet Protocol Suite

  • Application Protocols

    • Domain Name Protocol (DOMAIN)

    • File Transfer Protocol (FTP)

    • Network File System Protocol (NFS)

    • Telnet Protocol (TELNET)

    • Trivial File Transfer Protocol (TFTP)

    • Finger Protocol (FINGER)

    • Simple Mail Transfer Protocol (SMTP)

    • Simple Network Manager Protocol (SNMP)

  • Transport Protocols

    • User Datagram Protocol (UDP)

    • Transmission Control Protocol (TCP)

  • Network Level Protocols

    • Internet Protocol (IP)

    • Address Resolution Protocol (ARP)

    • Internet Control Message Protocol (ICMP)

    • Internet Group Management Protocol (IGMP)

• Supported Networks

  • ATM

  • Ethernet

  • Fast Ethernet

  • FDDI

  • Token Ring

• Application Programming Interfaces

  • X/Open Transport Interface (XTI/TLI)

  • BSD 4.3 Sockets

  • System V Release 4.0 STREAMS

  • Data Link Interface (DLI)

  • Data Link Provider Interface (DLPI)

  • Extensible SNMP (eSNMP)

• Network Administration Software

  • The entire suite of network commands and utilities from OSF Version 1.2

  • Ethernet, FDDI and loopback, packet filtering

  • Several popular packet filter applications in the public domain (rarpd, tcpdump, tcpslice, nfswatch, nfslogsum)

  • The screend security policy daemon (developed at Digital)

  • UUCP from HoneyDanBer

  • Local Area Transport (LAT)

  • Dynamic Host Configuration Protocol (DHCP)

• Naming Services

  • Berkeley Internet Name Domain (BIND)

  • Yellow Pages/Network Information Services (YP/NIS)

• Time Services

  • Network Time Protocol (NTP)

  • Time Synchronization Protocol (TSP)

The following sections briefly discuss the networking functionality in Digital UNIX Version 4.0.