On Dec 24, 2011, at 4:36 PM, Masataka Ohta 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]. >
These do not conflict. > and a reasonable interpretation is SLAAC MUST be supported if > ND is supported. > The implementation of IPv6 in a host MUST support SLAAC. That does not mean that the host must use that support in any particular environment. Owen
