I think the PIX fixup functionality can be achived through CBAC and PAM. But CBAC supports only a set of protocols that are very commonly used such as FTP, HTTP etc. PAM is used to inspect these commonly used protocols that run on non-standard ports.
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...