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Re: 2401bis Issue # DD -- Anti-replay notification
Since anti-replay is purely a receiver option, the receiver can tell
the sender that the receiver does not care about AR for a given SA,
and thus permit the sender to NOT create a new SA when the counter
wraps. Clearly this would not be needed if we always used 64-bit
sequence numbers, but while we require support for 64-bit sequence
numbers in ESPv3, we don't mandate their use.