This document was produced through funding of the National Science Foundation. Copyright (C) 1987, by the Board of Trustees of The University of Illinois. Permission to duplicate this document, in whole or part, is granted provided reference is made to the source and this copyright is included in whole copies. This document assumes that one is familiar with the workings of a non-connected simple IP network (. a few BSD systems on an Ethernet not connected to anywhere else). Appendix A contains remedial information to get one to this point. Its purpose is to get that person, familiar with.
