"Linux developer David Laight added, "It was pretty much obsolete when I was writing ethernet drivers in the early 1990's. Sort of surprising support ever got i

"Linux developer David Laight added, "It was pretty much obsolete when I was writing ethernet drivers in the early 1990's. Sort of surprising support ever got into Linux in the first place!" When I worked as a network consultant in the early to late 90's I had multiple clients each with thousands of nodes using DECnet. I was 1 consulting network engineer providing services in a limited geographic area, so if I had that many customers with that many DECnet nodes I feel safe in saying it was still in wide use during the early 1990s.