> Bound, Jim wrote: > > But it is possible to change the meaning of A=0 to mean use > dhc if you have > > it. > > > > Also multiple prefixes can be provided. > > > > L and A are orthogonal. If you set L and not A all that was > stated is use > > these for link knowlege but not for autoconfigure. > > But the fact that the A flag appears in every Prefix > information option > makes defining the semantics of A=0 as "use DHC" quite tricky. > > Suppose the RA contains 2 PIOs: > prefix1, A=1, O=1, R=0 > prefix2. A=0, O=0, R=1 > (The R flag was defined in the Mobile IPv6 RFC) > > Should this mean "use DHC" or not? > > What if some future RFC introduces an additional flag in the Prefix > information option (as Mobile IPv6 just did); what's the semantics of > A=0, O=0, R=0, New flag=1 > in terms of DHC? Does the semantics change whether or not there are > other prefixes included in the RA. > > Thus defining the semantics of the M/O bits in the RA is trivial > compared to trying to overload A=0!
Agreed the overload as you state would be very tricky and I agree it is probably not worth it to pursue. thanks /jim > > Erik > -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
