I think Lachman (where I was working at the
time) did a lot of streams based TCP/IP, they may have done one for
the vax.
Pre-SVR4 it was pretty much Lachman and Wollongong addons for pure
SYSV releases.
But why would you want it? It was a steaming pile of
sh*t.
Amen! It's a bloody miracle the Lachman code worked at all (on the 3B2
at least). The Wollongong code was better. But both faithfully
reproduced all the original BSD libc bugs.