I don't know of a way to do this because the PIX can only have one default route. You could accomplish this by using a router before the PIX and running a routing protocol or perhaps setting up a floating static route.
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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...