Network Working Group University of California Los Angeles Request for Comments: 18 Vint Cerf Category: September 1969 It is suggested that link 1 be used for the HOST-HOST control link and link 0 be used for IMP-IMP control. This will facilitate communication between Hosts and reduce delays due to interference with IMP-IMP communications. [This RFC has been restored to on-line status by Elmar K. Bins] [Page 1]