Chris, > Do you think that Neighbor Discovery needs to be extended to support the > advertisement of (S,D) routes?
No, I'm hoping we can avoid that. > Currently ND Router Advertisements allow the advertisement of source prefixes > in PIOs and destination prefixes in RIOs, but I don't see any existing > mechanism to associate a particular source prefix with a particular > destination prefix. draft-sarikaya-6man-sadr-ra-03 offers one way to > associate a source prefix with a destination prefix in Router Advertisements. > > If not, what mechanism do you think should be used to communicate (S,D) > routes to the host? In the general case explicit S,D routes to hosts are not needed. There are two cases, first when a host is connected to two uncoordinated routers (e.g. ISP A, ISP B), in that case draft-ietf-6man-multi-homed-host clarifies that a host should associate source prefix with the default from router discovery. I.e. an implicit instead of explicit S,D route. In the case, e.g. homenet it is assumed that all routers are part of the same IGP, and if host picks 'wrong' router, the only consequence is an extra hop. If a host really really wants to participate in routing, it can of course run a routing protocol. Do you see anything missing? Best regards, Ole
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