Issue:
What is the handling for the case where a prefix's preferred lifetime
exceeds the valid lifetime?
Suggestion: Specify that a router MUST NOT send a prefix option
containing preferred lifetime > valid lifetime
Current text in Preferred Lifetime description (sec 4.2):
Preferred Lifetime
32-bit unsigned integer. The length of time in
seconds (relative to the time the packet is sent)
that addresses generated from the prefix via
stateless address autoconfiguration remain
preferred [ADDRCONF]. A value of all one bits
(0xffffffff) represents infinity. See [ADDRCONF].
Note that the value of this field MUST NOT exceed
the Valid Lifetime field to avoid preferring
addresses that are no longer valid.
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