This rule derives directly from the Terminology section of RFC 4861 (definition of on-link).
Note that the presence of a bogus entry causes no harm (the routing table takes precedence over the ND cache in this case). However, the removal of the rule DOES cause harm in the case of communication without routers. Therefore, we currently see no reason to change the text. - Wes & Hemant -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Wojciech Dec (wdec) Sent: Thursday, June 26, 2008 10:05 AM To: Brian Haberman; ipv6@ietf.org Cc: MILES DAVID; Bob Hinden Subject: RE: 6MAN WG Last Call:draft-ietf-6man-ipv6-subnet-model-00.txt Based on a recent thread (http://www.ops.ietf.org/lists/v6ops/v6ops.2008/msg00896.html) the following paragraph from the draft appears to warrant some more thought if not outright a revision " In addition to the Prefix List, individual addresses are on-link if they are the target of a Redirect Message indicating on-link, or the source of a valid Neighbor Solicitation or Neighbor Advertisement message. Note that Redirect Messages can also indicate an address is off-link. Individual address entries can be expired by the Neighbor Unreachability Detection mechanism." Using unconditionally the source address of a neighbour solicitation or NA to determine on-link would indeed appear to be undesirable, unless the intent is allow some direct host-host cross subnet/prefix communication without a router involved at any stage (this is not a good idea IMO). A constraint could be introduced such as: A host only learns on-link addresses from the source of NS and NA messages iff it already has an on-link prefix that would cover that address. Learning from Redirect messages would continue to be allowed. My 2c. -Woj. > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf > Of Brian Haberman > Sent: 26 June 2008 14:17 > To: ipv6@ietf.org > Cc: Bob Hinden > Subject: 6MAN WG Last Call:draft-ietf-6man-ipv6-subnet-model-00.txt > > All, > This message starts a 3-week 6MAN Working Group Last Call on > advancing: > > Title : IPv6 Subnet Model: the Relationship between > Links and Subnet Prefixes > Author(s) : H. Singh, et al. > Filename : draft-ietf-6man-ipv6-subnet-model-00.txt > Pages : 8 > Date : 2008-05-08 > > as a Proposed Standard. Substantive comments and statements of > support for advancing this document should be directed to the mailing > list. > Editorial suggestions can be sent to the document editor. > This last call will end on July 10, 2008. > > Regards, > Brian & Bob > 6MAN co-chairs > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > ipv6@ietf.org > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- > -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 -------------------------------------------------------------------- -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
