On Mon, Oct 21, 2002 at 10:27:48AM -0400, Vladislav Yasevich wrote: > [Nick Moore wrote:] > > > A NA with S=0,O=0 for a REACHABLE entry will have no effect on the > > entry according to the Appendix C state machine, and these are the > > only NAs which the ON will sent to All Nodes which Tentative. > > Admittedly an NA with S=1,O=0 will reset a REACHABLE entry to STALE, > > but why is the correspondent soliciting for a REACHABLE entry? > > (Or have I missed something elsewhere?) > > Hmm. Here is a quote from rfc 2461, section 7.2.5: > "If the target's Neighbor Cache entry is in any state other than > INCOMPLETE when the advertisement is received, processing becomes > quite a bit more complex. If the Override flag is clear and the > supplied link-layer address differs from that in the cache, then one > of two actions takes place: if the state of the entry is REACHABLE, > set it to STALE, but do not update the entry in any other way; > otherwise, the received advertisement should be ignored and MUST NOT > update the cache."
Ah, I see what you mean. RFC 2461 contradicts itself then, since Appendix C states: | !INCOMPLETE NA, Solicited=1, Record link-layer REACHABLE | Override=1 address (if | different). | | !INCOMPLETE NA, Solicited=0, - unchanged | Override=0 | | !INCOMPLETE NA, Solicited=0, - unchanged | Override=1 | Same link-layer | address as cached. | | !INCOMPLETE NA, Solicited=0, Record link-layer STALE | Override=1 address. | Different link-layer | address than cached. Now, I understand that the main text would generally trump a mere Appendix, but the appendix rules seem to me to make more sense. My draft is based on the Appendix C rules so yes, I'd have to rethink a few things based on 7.2.5. Would one of the RFC2461 authors like to comment? -----Nick -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------
