Cisco 1604 to Linksys BEFSR41 to LAN

[calvinX]

Hi

I am wondering how can I configure my Cisco 1604 router to allow all traffic to pass through. I want to use the Linksys unit for a VPN connection. The problem is we are on an ISDN connection here and I need to use the 1604.

What I want to do (without having to become a CCNA) is open up all ports on the Cisco 1604 which will pass traffic to the Linksys router which will then allow or disallow traffic onto our network, the setup looks like this:

(CISCO 1604) <----> (LINKSYS BEFSR41) <----> LAN

Thanks

Calvin