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!
Erik
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