It was called DNI if my memory serves?.  Google turns up
Tony
On Mon, 8 Nov 2021 at 13:24, Dave McGuire <mcguire at neurotica.com> wrote:
  On 11/7/21 9:12 PM, John Forecast wrote:
  There was a company called Technology Concepts in
Sudbury MA, which was 
 founded by Stu Wecker the original architect of DDCMP. They
provided a core
 implementation of DECnet for Unix systems (I know they had an
 implementation for early Sun systems).
    I'd heard that there was a DECnet implementation for SunOS, but I'm
 pretty sure I was never able to find it.
             -Dave
 --
 Dave McGuire, AK4HZ
 New Kensington, PA