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http://it.slashdot.org/comments.pl?sid=155038&cid=12998126 http://it.slashdot.org/comments.pl?sid=155038&cid=12996714
Seems, that while Phase V was aimed to outperform Phase IV, results were doubtfull, if not just opposite :(
Quote from comp.os.vms Phase IV manuals
Isto Ylisirkka 08:01, 6 October 2005 (UTC)
MOP is not a network layer protocol. Its spec shows it in the "network management modules", which isn't really a layer (it's better viewed as something "to the side of" the regular stack.
DECnet was never viewed as an 8 layer model. It is a 7 layer model. I suspect the statement about "8 layers" is a misinterpretation of the picture in the Phase IV protocol specs; as I mentioned above, the "network management modules" shown in the structural model diagram isn't a layer in the OSI sense. In current terminology it would be part of the "control plane", and "to the side of" the data stack.
The use of the term "proprietary" is misleading. (See also Legitimacy of standards). While DECnet was developed by DEC, the specifications were available to all parties at no charge, and third party implementations were not just permitted but encouraged. Several companies did so, and for that matter there is at least one open source implementation (in Linux). Paul Koning 15:25, 23 March 2007 (UTC)
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
Changing the MAC address means that there is no need for a network-layer-address to link-layer-address mapping protocol, like ARP for IPv4. However this has nothing to do with routers. Royhills 12:22, 30 March 2007 (UTC)
How many nodes did it have in its heyday? Wasn't it one of the biggest world-wide networks in the 80s? Would be nice to have a diagram or some figures. Googling for "decnet size" only returns misspellings of "decent".-- 87.162.58.144 11:48, 28 August 2007 (UTC)
I included some of the above info in a new section, "Notable installations". -- HLachman ( talk) 09:53, 19 August 2018 (UTC)
It seems that HP has retired the server that runs ftp.digital.com. The announcement can be found here: http://h18002.www1.hp.com/alphaserver/options/asgs1280/asgs1280_options.html
The ftp service is now inaccessible. The ftp.digital.com link at the bottom of this page should be replaced with another link that provides the same information if possible, or removed. Rilak ( talk) 08:06, 28 February 2008 (UTC)
Perhaps a mention of the DECNet based SPAN (Space Physics Analysis Network) is in order? -- 203.129.147.223 ( talk) 01:38, 17 June 2008 (UTC)
I added the above in a new section, "Notable installations". -- HLachman ( talk) 09:53, 19 August 2018 (UTC)
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Should there be mention of addressing, address space, and address size? I believe Phase IV is 32 bit addressing, but I don't see that anywhere. Gah4 ( talk) 19:29, 31 March 2020 (UTC)
There are two dead links from Columbia University that I just fixed. This is strange, because the last successful crawl showed activity as recent as July 2022, yet the pages return a 404. I'm not sure what's going on here. Hamishmb ( talk) 17:06, 3 August 2022 (UTC)
NB: Newly-dead but replaced links are: - https://www.columbia.edu/cu/computinghistory/ - https://www.columbia.edu/cu/computinghistory/dec20.html#networks
Replaced with: - https://web.archive.org/web/20220706001116/https://www.columbia.edu/cu/computinghistory/ - https://web.archive.org/web/20220707101822/https://www.columbia.edu/cu/computinghistory/dec20.html#networks
Hamishmb ( talk) 17:08, 3 August 2022 (UTC)
DECNET for at least one of the 4.1c BSD variants exists "in the wild". ("varient" as in tapes with a "4.1 BSD" label sticker on them can have different contents as 4.1* BSD appears to have been some sort of "rolling release")
The DECNET code is also in the BSD SCCS version control archives Those SCCS archives were converted to the fossil version control system and available on online at
Files in sys/deprecated/netdecnet/. Note that the "deprecated" directory is where it ended up after being in a "current" directory back in 1982. The same DECNET code is available on the CSRG ISO #1 in the directory 4.1c.1/sys/netdecnet
. --
Jamplevia (
talk) 01:47, 10 June 2023 (UTC)
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http://it.slashdot.org/comments.pl?sid=155038&cid=12998126 http://it.slashdot.org/comments.pl?sid=155038&cid=12996714
Seems, that while Phase V was aimed to outperform Phase IV, results were doubtfull, if not just opposite :(
Quote from comp.os.vms Phase IV manuals
Isto Ylisirkka 08:01, 6 October 2005 (UTC)
MOP is not a network layer protocol. Its spec shows it in the "network management modules", which isn't really a layer (it's better viewed as something "to the side of" the regular stack.
DECnet was never viewed as an 8 layer model. It is a 7 layer model. I suspect the statement about "8 layers" is a misinterpretation of the picture in the Phase IV protocol specs; as I mentioned above, the "network management modules" shown in the structural model diagram isn't a layer in the OSI sense. In current terminology it would be part of the "control plane", and "to the side of" the data stack.
The use of the term "proprietary" is misleading. (See also Legitimacy of standards). While DECnet was developed by DEC, the specifications were available to all parties at no charge, and third party implementations were not just permitted but encouraged. Several companies did so, and for that matter there is at least one open source implementation (in Linux). Paul Koning 15:25, 23 March 2007 (UTC)
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
Changing the MAC address means that there is no need for a network-layer-address to link-layer-address mapping protocol, like ARP for IPv4. However this has nothing to do with routers. Royhills 12:22, 30 March 2007 (UTC)
How many nodes did it have in its heyday? Wasn't it one of the biggest world-wide networks in the 80s? Would be nice to have a diagram or some figures. Googling for "decnet size" only returns misspellings of "decent".-- 87.162.58.144 11:48, 28 August 2007 (UTC)
I included some of the above info in a new section, "Notable installations". -- HLachman ( talk) 09:53, 19 August 2018 (UTC)
It seems that HP has retired the server that runs ftp.digital.com. The announcement can be found here: http://h18002.www1.hp.com/alphaserver/options/asgs1280/asgs1280_options.html
The ftp service is now inaccessible. The ftp.digital.com link at the bottom of this page should be replaced with another link that provides the same information if possible, or removed. Rilak ( talk) 08:06, 28 February 2008 (UTC)
Perhaps a mention of the DECNet based SPAN (Space Physics Analysis Network) is in order? -- 203.129.147.223 ( talk) 01:38, 17 June 2008 (UTC)
I added the above in a new section, "Notable installations". -- HLachman ( talk) 09:53, 19 August 2018 (UTC)
Hello fellow Wikipedians,
I have just modified 2 external links on DECnet. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
This message was posted before February 2018.
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have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the
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(last update: 18 January 2022).
Cheers.— InternetArchiveBot ( Report bug) 22:35, 2 September 2017 (UTC)
Should there be mention of addressing, address space, and address size? I believe Phase IV is 32 bit addressing, but I don't see that anywhere. Gah4 ( talk) 19:29, 31 March 2020 (UTC)
There are two dead links from Columbia University that I just fixed. This is strange, because the last successful crawl showed activity as recent as July 2022, yet the pages return a 404. I'm not sure what's going on here. Hamishmb ( talk) 17:06, 3 August 2022 (UTC)
NB: Newly-dead but replaced links are: - https://www.columbia.edu/cu/computinghistory/ - https://www.columbia.edu/cu/computinghistory/dec20.html#networks
Replaced with: - https://web.archive.org/web/20220706001116/https://www.columbia.edu/cu/computinghistory/ - https://web.archive.org/web/20220707101822/https://www.columbia.edu/cu/computinghistory/dec20.html#networks
Hamishmb ( talk) 17:08, 3 August 2022 (UTC)
DECNET for at least one of the 4.1c BSD variants exists "in the wild". ("varient" as in tapes with a "4.1 BSD" label sticker on them can have different contents as 4.1* BSD appears to have been some sort of "rolling release")
The DECNET code is also in the BSD SCCS version control archives Those SCCS archives were converted to the fossil version control system and available on online at
Files in sys/deprecated/netdecnet/. Note that the "deprecated" directory is where it ended up after being in a "current" directory back in 1982. The same DECNET code is available on the CSRG ISO #1 in the directory 4.1c.1/sys/netdecnet
. --
Jamplevia (
talk) 01:47, 10 June 2023 (UTC)