C&E-Guide says:
Replay Protection: A replay attack occurs when somebody intercepts a series of packets and uses them
later either to flood the system, causing a denial-of-service (DoS), or to gain entry to
the trusted network. The replay-protection feature enables security devices to check
every IPSec packet to see if it has been received previously. If packets arrive outside
a specified sequence range, the security device rejects them.
Can this option cause any problems if one side has this option turned on and the other side not?