http://www.rfc-editor.org/rfc/rfc0824.txt
RFC 0824: CRONUS Virtual Local Network, W.I. MacGregor, D.C. Tappan1982-08-01T23:00:00-00:00The purpose of this note is to describe the CRONUS Virtual Local Network, especially the addressing related features. These features include a method for mapping between Internet Addresses and Local Network addresses. This is a topic of current concern in the ARPA Internet community. This note is intended to stimulate discussion. This is not a specification of an Internet Standard.