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Assume the PIX has three interfaces or elss trunking has to be enabled.Run a routing protocol ospf between the PIX and the routerConfigure a static default route with metric higher than 110 and point it to the fall back route.below is a sample config...
First, icmp is not really consider stateful in the Cisco PIX, at least in 6.3 train anyway. And the interface of the PIX is by default not pingable. Also, you can only ping the inside PIX interface from the inside network, you cannot ping the PIX out...