Well, a PIX is not a router. The PIX is a standalone firewall that is very fast and very secure. Its usually best to protect the perimeter of your network using a PIX and the routers and switches should just do routing. Your Cisco design engineers should be able to help determine whats best in your topology.
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...