I thinkg either way you have the luxury of downtime, so I would recommend shutting down interface taking out intial DHCPD setting and re-adding the new settings. It would not allow you to change if both are active at the same time.
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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...