RFC 1433 (rfc1433) - Page 1 of 18

Directed ARP

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Network Working Group                                        J. Garrett
Request for Comments: 1433                       AT&T Bell Laboratories
                                                               J. Hagan
                                             University of Pennsylvania
                                                                J. Wong
                                                 AT&T Bell Laboratories
                                                             March 1993


                              Directed ARP

Status of this Memo

   This memo defines an Experimental Protocol for the Internet
   community.  Discussion and suggestions for improvement are requested.
   Please refer to the current edition of the "IAB Official Protocol
   Standards" for the standardization state and status of this protocol.
   Distribution of this memo is unlimited.

Abstract

   A router with an interface to two IP networks via the same link level
   interface could observe that the two IP networks share the same link
   level network, and could advertise that information to hosts (via
   ICMP Redirects) and routers (via dynamic routing protocols).
   However, a host or router on only one of the IP networks could not
   use that information to communicate directly with hosts and routers
   on the other IP network unless it could resolve IP addresses on the
   "foreign" IP network to their corresponding link level addresses.
   Directed ARP is a dynamic address resolution procedure that enables
   hosts and routers to resolve advertised potential next-hop IP
   addresses on foreign IP networks to their associated link level
   addresses.

Acknowledgments

   The authors are indebted to Joel Halpern of Network Systems
   Corporation and David O'Leary who provided valuable comments and
   insight to the authors, as well as ongoing moral support as the
   presentation of this material evolved through many drafts.  Members
   of the IPLPDN working group also provided valuable comments during
   presentations and through the IPLPDN mailing list.  Chuck Hedrick of
   Rutgers University, Paul Tsuchiya of Bell Communications Research,
   and Doris Tillman of AT&T Bell Laboratories provided early insight as
   well as comments on early drafts.






Garrett, Hagan & Wong
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