Yes you can do this, but if the concentrator sees any traffic from an internal host that is also in its address pool, it'll do as you're seeing and mark that address as unusable. Check the concentrators ARP table under Monitoring - Statistics - MIB-II Stats - ARP Table to see what internal hosts it knows about.
In your example it has seen some traffic from the host at 10.225.251.1 which is also in it's address pool and has therefore told you that it can't use it.
Login to the FXOS chassis manager.
Direct your browser to https://hostname/, and log-in using the user-name and password.
Go to Help > About and check the current version:
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...