Douglas McNaught <doug(at)mcnaught(dot)org> writes:
> You could also enforce use of the
> private network (in both cases) by use of firewall rules.
I think the real point here is that any additional security you gain
comes from having the physically separate wire. It's foolish to suppose
that using a nonstandard protocol over that wire is going to buy
anything. So there's no point in going through a lot of pushups to
substitute something else for TCP/IP.
regards, tom lane