>> > I don't know of any cases where omitting ND for IPv6 addresses makes >> > much sense. >> >> OK, so at least we've clarified that we're in disagreement. I don't see >> support in the specs for doing address resolution on links without >> link-layer addresses. what would the purpose be in doing address >> resolution on a link without link-layer addresses? > > Generating NS and processing NA drives the state machine associated > with neighbor cache entries. > >> other ND functions, of course they should be supported. > > I don't see how you get there at all. You need to be doing > solicitations and advertisements in order to do unreachability > detection and those "other ND functions," don't you?
sure, if you need those functions. on router to router links you don't need NUD, which is why I don't want to make it a MUST in the specification. > If you're going to somehow omit ND for address resolution, but use it > for everything else, what exactly does that look like on the wire, and > what support in the existing RFC is there for this sort of operation? > > I know what the current RFC suggests -- that is, that we send all of > the usual messages based on neighbor cache entry state (just as with > broadcast-type networks), but that the SLLA/TLLA option isn't used on > any messages because the peers are point-to-point. It's the same > protocol -- one option less. > > What alternative usage are you suggesting? At a guess, the system > that would send NS because it lacks a neighbor cache entry instead > simply creates the entry and "jumps" straight to REACHABLE state > because it already "knows" where the peer is located. Is that it? > What other protocol changes are required in order to make ND-for- > everything-but-address-resolution mode work? no, if you need reachability confirmation you need to go through the whole shebang. cheers, Ole -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
