I think perhaps you are confusing "what must be supported by implementations" (and ignoring the text describing the requirements) as stated in 6434, with operational usage.
For example - SLAAC must be supported by the implementations, but an environment isn't required to use it. /TJ On Dec 24, 2011 7:34 PM, "Masataka Ohta" <[email protected]> wrote: > Joel jaeggli wrote: > > >> First of all, ND use is optional and, if ND is used, RA > >> must be used. > >> > >> It means that, if RA is not used, ND can't be used. > > > > Finding and maintaining the l2 address for a device on a subnet where RA > > is not used is a pretty common activity so I'm not sure how your would > > conclude that. 2461/4861/5942 certainly don't preclude that. > > RFC6434 has contradictory statements: > > Neighbor Discovery SHOULD be supported. > > and > > Hosts MUST support IPv6 Stateless Address Autoconfiguration as > defined in [RFC4862]. > > and a reasonable interpretation is SLAAC MUST be supported if > ND is supported. > > Or, we shouldn't expect IPv6 specifications reasonable, > which means reasonable operation is impossible. > > Masataka Ohta > >
