Tim Wilkinson wrote:

> OK please be gentle, it must be 15 years since I last touched a vax./vms

Aha, excuses, excuses ... ;-)

> So VMS 7.3 installed and working on a subnetted network. (tcp on a vax. new
> to me, it was all decnet and lat in my day).
> [...snip...]
>
> I had seen similar in old systems years ago, where ip stacks did not
> properly support subnet masking. But I would have thought DEC would have got
> this right.

Old(er) versions of TCP/IP Services did indeed have this problem.
I don't recall off the top of my head which version this eventually
got fixed in. Please tell us what version you are using:

$ tcpip show version

> Advice please guys how do I fix this

Simple: install a more recent version where subnetting works.