RFC 1433 (rfc1433) - Page 1 of 18
Directed ARP
Alternative Format: Original Text Document
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