Forward from GNU volunteer coordination

[Greg McGary]

> ... If a simple
> self-contained implementation of IP and TCP is impractical, it might be
> necessary to design a new, simple protocol based directly on ethernet.

I've done UDP stubs for embedded systems.  Standalone UDP is quite
serviceable and much easier to implement than TCP and has the
advantage of being useable across IP internets, whereas a custom
direct-ethernet protocol would not.