First, you don't need a router between your 2 PIX, execpt if you need some routing features or functionality.
PIX isn't a router, they passed trafic from one interface to an another based on some specified rules.
But, my comments is based on what you tell us. Because, you don't explain your needs instead, you exposed a solution (router between PIXes). We don't really know your needs or problems you try to resolve.
You have to add static route statements in the PIX's for each subnet .
i.e. In PIX1 add static route for each subnet (or supernet) in PIX2 to exit from the outside interface of pix1(i assume outside of pix1 is connected to pix2) and similarly in pix2 add static route for all the subnets in pix1 to exit from outside of pix2.
From what I see, you need to tell the PIX which IP addresses/ranges to send to the other PIX. You need to tell it discretely what to send to the other PIX.
The PIX is not a Layer 3 or routing device at all. If you've ever worked with any midrange or mainframe systems, you might be aware that they can be set to direct outbound traffic to specific gateways. Many of the newer systems can even listen to routing protocols to learn which gateways to use to reach subnets more efficiently. You wouldn't call that routing, as it is just a more intelligent gateway selection.
Look at the PIX as having that same capability of those systems. It's able to choose different gateways for different destinations. That's not routing at all.
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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...