IPv6 Neighbor Discovery On-Link Assumption Considered Harmful
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From: The IESG <firstname.lastname@example.org> To: IETF-Announce <email@example.com> Cc: Internet Architecture Board <firstname.lastname@example.org>, RFC Editor <email@example.com>, v6ops mailing list <firstname.lastname@example.org>, v6ops chair <email@example.com> Subject: Document Action: 'IPv6 Neighbor Discovery On-Link Assumption Considered Harmful' to Informational RFC The IESG has approved the following document: - 'IPv6 Neighbor Discovery On-Link Assumption Considered Harmful ' <draft-ietf-v6ops-onlinkassumption-05.txt> as an Informational RFC This document is the product of the IPv6 Operations Working Group. The IESG contact persons are David Kessens and Dan Romascanu. A URL of this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-ietf-v6ops-onlinkassumption-05.txt
Technical Summary This document describes the historical and background information behind the removal of the "on-link assumption" from the conceptual host sending algorithm defined in Neighbor Discovery for IP Version 6 (IPv6). According to the algorithm as originally described, when a host's default router list is empty, the host assumes that all destinations are on-link. This is particularly problematic with IPv6-capable nodes that do not have off-link IPv6 connectivity (e.g., no default router). This document describes how making this assumption causes problems, and describes how these problems outweigh the benefits of this part of the conceptual sending algorithm. Working Group Summary This document is a product of the v6ops working group. Protocol Quality David Kessens reviewed this document for the IESG.