DECnet is a proprietary suite of network protocols created by DEC, originally released in 1975 in order to connect two PDP-11 minicomputers. It evolved into one of the first peer-to-peer network architectures, thus transforming DEC into a networking powerhouse in the 1980s.
Initially built with four layers, it later (1992) evolved into a seven layer OSI compliant networking protocol, around the time when open systems (POSIX compliant, i.e. Unix-like) were grabbing marketshare from the proprietary OSes, like VMS.
DECnet was built right into the DEC flagship operating system VAX/VMS since its inception. Digital also ported it to its own Ultrix variant of UNIX, as well as Apple Macintosh computers and PCs running both DOS and Windows under the name DEC Pathworks, transforming these systems into DECnet end-nodes in a network of VAX machines. More recently, an open-source version has been developed for the Linux OS: see Linux-DECnet on Sourceforge.
- 1 Brief overview of the evolution of DECnet
- 2 DECnet Manuals and Software Product Descriptions
- 3 References
- 4 See also
- 5 Related articles and practical guides
Brief overview of the evolution of DECnet
DECnet refers to a specific set of hardware and software networking products which implement the DIGITAL Network Architecture (DNA). The DIGITAL Network Architecture is essentially a set of documents which define the network architecture in general, state the specifications for each layer of the architecture, and describe the protocols which operate within each layer. Although network protocol analyzer tools tend to categorize all protocols from DIGITAL as "DECnet", strictly speaking, non-routed DIGITAL protocols such as LAT, SCS, AMDS, LAST/LAD are not DECnet protocols and are not part of the DIGITAL Network Architecture.
To trace the evolution of DECnet is to trace the development of DNA. The beginnings of DNA were in the early 1970s. DIGITAL published its first DNA specification at about the same time that IBM announced its Systems Network Architecture (SNA). Since that time, development of DNA has evolved through the following phases:
Phase I (1974)
Phase II (1976)
Support for networks of up to 32 nodes with multiple, different implementations which could interoperate with each other. Implementations expanded to included RSTS/E, TOPS-10, TOPS-20 and VMS (from VMS V1.0 / DECnet-VAX V1.0) with communications between processors still limited to point-to-point links only. Introduction of file transfer (FAL), remote file access (DAP), task-to-task programming interfaces and network management features.
Phase III (1980)
Support for networks of up to 255 nodes over point-to point and multi-drop links for VMS (from VMS V3.0 / DECnet-VAX V3.0) and other DEC operating systems. Introduction of adaptive routing capability, downline loading (MOP), record access, a network management architecture, and gateways to other types of networks including IBM’s SNA and CCITT Recommendation X.25.
Phase IV (1982) and Phase IV+ (1983)
Phase IV was released initially to RSX-11 and VMS systems (from VMS V3.4 / DECnet-VAX V3.1), later TOPS-20, TOPS-10, ULTRIX, VAXELN, and RSTS/E gained support. Support for networks of up to 255 nodes, datalink capabilities expanded beyond DDCMP to include CI (VMS only) and Ethernet local area network support as the datalink of choice, expanded adaptive routing capability to include hierarchical routing (areas, level 1 and level 2 routers), VMScluster support (cluster alias) and host services (CTERM).
CTERM allowed a user on one computer to log into another computer remotely, performing the same function that Telnet does in the TCP/IP protocol stack. Digital also released a product called the PATHWORKS client, and more commonly known as the PATHWORKS 32 client, that implemented much of DECnet Phase IV for DOS, and 16 and 32 bit Microsoft Windows platforms (all the way through to Windows Server 2003).
Phase IV implemented an 8 layer architecture similar to the OSI (7 layer) model especially at the lower levels (see diagram below). Since the OSI standards were not yet fully developed at the time, many of the Phase IV protocols remained proprietary.
The Ethernet implementation was unusual in that the software changed the physical address of the Ethernet interface on the network to AA-00-04-00-xx-yy where xx-yy reflected the DECnet network address of the host. This allowed router-less LAN operation because the LAN address could be deduced from the DECnet address. This precluded connecting two NICs from the same DECnet node onto the same LAN segment, however.
The initial implementations released were for VMS and RSX-11, later this expanded to virtually every operating system DIGITAL ever shipped with the notable exception of RT-11. DECnet stacks are found on Linux, SunOS and other platforms, and Cisco and other network vendors offer products that can cooperate with and operate within DECnet networks. Full DECnet Phase IV specifications are available.
At the same time that DECnet Phase IV was released, the company also released a proprietary protocol called LAT for serial terminal access via Terminal servers. LAT is entirely separate from DECnet, though many DECserver LAT terminal servers did use MOP for the server image download and related bootstrap processing.
Enhancements made to DECnet Phase IV eventually became known as DECnet Phase IV+, although systems running this protocol remained completely interoperable with DECnet Phase IV systems.
Phase IV+ (e.g. from VMS 4.0 / DECnet-VAX V4.0) added Support for networks of up to 64,449 nodes (63 areas of 1023 nodes).
Phase V and Phase V+ (1987)
Support for very large (architecturally unlimited) networks, a new network management model, local or distributed name service, improved performance over Phase IV. Move from a proprietary network to an Open Systems Interconnection (OSI) by integration of ISO standards to provide multi-vendor connectivity and compatibility with DNA Phase IV, the last two features resulted in a hybrid network architecture (DNA and OSI) with separate “towers” sharing an integrated transport layer. Transparent transport level links to TCP/IP were added via the IETF RFC 1006 (OSI over IP) and RFC 1859 (NSP over IP) standards (see diagram below).
It was later renamed DECnet/OSI to emphasize its OSI interconnectibility, and subsequently DECnet-Plus as TCP/IP protocols were incorporated.
DECnet Manuals and Software Product Descriptions
- DECnet-VAX V1.0
- DECnet-VAX V1.3
- AE-D624E-TE SPD 25.3.4 DECnet-VAX, Version 1.3
- DECnet-VAX V3.0
- DECnet-VAX V3.1
- AA-H803C-TE DECnet-VAX System Manager's Guide
- DECnet-VAX V4.x
- DECnet-VAX V5.x
- DECnet-VAX V6.0:
- DECnet-VAX V8.4:
- DECnet-11M V2.0
- DECnet-11M V4.0 / DECnet-11M-PLUS V2.0
- AA-H224C-TC DECnet-RSX System Manager's Guide
- AA-X924A-TC DECnet-RSX System Manager's Minireference Guide
- AA-J517C-TC DECnet-RSX Release Notes
- DECnet-11M V4.2 / RSX-11M-PLUS V3.0
- AA-J517D-TC DECnet-RSX Release Notes
- AA-EB30A-TC DECnet-RSX Guide to Network Management Utilities
- AA-EB29A-TC DECnet-RSX Network Management Concepts and Procedures
- AA-M098C-TC DECnet-RSX Programmers Reference Manual
- AA-H223D-TC DECnet-RSX Guide to User Utilities
- AA-H225D-TC DECnet-RSX Network Generation and Installation Guide
- DECnet-11M V4.3 / DECnet-11M-PLUS V4.0
- DECnet-11M V4.5 / DECnet-11M-PLUS V4.3
- AA-EB28C-TC DECnet-RSX Network Management Concepts and Procedures
- AA-EB30C-TC DECnet-RSX Guide to Network Management Utilities
- AA-H223F-TC DECnet-RSX Guide to User Utilities
- AA-H225F-TC DECnet-RSX Network Generation and Installation Guide
- AA-J517F-TC DECnet-RSX Supplemental Information and Release Notes
- AA-M098E-TC DECnet-RSX Programmers Reference Manual
- DECnet-11M V4.8 / DECnet-11M-PLUS V4.6
- DECnet/E V1.0
- DECnet/E V2.0
- DECnet-DOS V1.1
- DECnet-DOS V3.0
- AA-PAFFA-TK DECnet-DOS Getting Started
- DECnet-ULTRIX V1.1
- DECnet Ultrix V1.1 Release Notes
- DECnet-ULTRIX V2.0
- AA-EE38C-TE ULTRIX-32 DECnet Network Management
- DECnet/ULTRIX V3.0
- AA-JD82D-TE DECnet-ULTRIX Release Notes
- BH-EA86G-TE DECnet/ULTRIX Version 3.0 and 3.0a SPD 26.83.06
- AA-EA87D-TE DECnet-ULTRIX Installation Guide
- AA-EA88C-TE DECnet-ULTRIX User's and Programmer's Guide
- DECnet-ULTRIX V4.0
- DECnet-ULTRIX V4.2
- DECnet-ULTRIX Release Notes V4.2
- DECnet-RT V1.0
- DECnet-RT V1.1
- SPD10.72.4 DECnet-RT V1.1.pdf
- SPD10.72.5 DECnet-RT V1.1.pdf
- DECnet-RT V2.0
- SPD10.72.7 DECnet-RT V2.0.pdf
- SPD10.72.8 DECnet-RT V2.0.pdf
- DECnet/8 V1.0
- DECnet-10 V2.0
- DECnet-20 V1.0
- DECnet-20 V2.0
- DECnet-11D V2.0
- DECnet-11S V2.0
- DECnet-IAS V2.0
- Carl Malamud, Analyzing DECnet/OSI Phase V. Van Hostrand Reinhold, 1991. ISBN 0-442-00375-7.
- James Martin, Joe Leben, DECnet Phase V: An OSI Implementation. Digital Press, 1992. ISBN 1-55580-769-0.
- DECnet-Plus manuals for OpenVMS are available at http://www.hp.com/go/openvms/doc/
- DECnet Phase IV OpenVMS manuals for DECnet Phase IV; these Phase IV manuals are archived on OpenVMS Freeware V5.0 distribution, at http://www.hp.com/go/openvms/freeware and other sites.
- DECnet Phase IV architecture manuals (including DDCMP, MOP, NICE, NSP, DAP, CTERM, routing); at http://ftp.digital.com/pub/DEC/DECnet/PhaseIV/ and other sites.
- HECnet, a hobbyist DECnet bridged over IP.