Cisco 871 router port forwarding

Can somebody please give me directions on where and how in the SDM
software where I can configure the router/firewall to allow certain
ports to be "passed through" or forwarded to an ip on the inside
network.

I do not want to use any of the VPN features that come with this 871
router. I have a VPN server already on the LAN side that will be used.


In order to connect to it, i need to ..
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Tags: cabling Cisco Networking fiber optic LAN