Adding a firewall in a Multinetted router

Is it possible to add a firewall to a router which ends to the Internet as well as 2 internal subnets? A subnet is on the side of the ethernet and theother is across a WAN link. This is the one I can't figure out how to route traffic through the firewall instead of directly on the router serial i / f to the Internet.

Any help would be appreciated.

John

The document has more details on the configuration of the PIX Firewall with two internal networks.

http://www.Cisco.com/en/us/products/HW/vpndevc/ps2030/products_configuration_example09186a0080094767.shtml

Tags: Cisco Network

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