The internal router has a different default gateway and does not have a route back to the PIX Firewall for the VPN pool address range
A route, which is either statically defined or dynamically discovered, specifies the path used by a router or host to forward IP packets. You must define a special route, called the default route, for forwarding packets when no route is known. Packets destined for an unknown network are forwarded to the default router, which is sometimes called the "gateway of last resort".
To configure the default routes on a Cisco IOS router to forward traffic to the PIX, perform these steps:
1. Telnet to the router that connects to the inside interface of the PIX.
2. Access the Cisco IOS configuration mode.
3. Set the default route to the inside interface of the PIX with this Cisco IOS Command Line Interface (CLI) command:
ip route 0.0.0.0 0.0.0.0 if_address
For each PIX interface that is connected to a router, replace if_address with the IP address of the PIX interface.
Issue the show ip route command and make sure that the connected PIX interface is listed as the "gateway of last resort."
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