http://tools.ietf.org/html/rfc792

Updated by: 1349, 4379 STANDARD

Network Working Group                    Internet Engineering Task Force
Request for Comments: 1122                             R. Braden, Editor
                                                            October 1989


        Requirements for Internet Hosts -- Communication Layers

Extracted from page 40 and 41.

         3.2.2.2  Redirect: RFC-792

            A host SHOULD NOT send an ICMP Redirect message; Redirects
            are to be sent only by gateways.

            A host receiving a Redirect message MUST update its routing
            information accordingly.  Every host MUST be prepared to
            accept both Host and Network Redirects and to process them
            as described in Section 3.3.1.2 below.

            A Redirect message SHOULD be silently discarded if the new
            gateway address it specifies is not on the same connected
            (sub-) net through which the Redirect arrived [INTRO:2,
            Appendix A], or if the source of the Redirect is not the
            current first-hop gateway for the specified destination (see
            Section 3.3.1).