Looking for low cost VPN/DMZ solution

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http://serverfault.com – I am looking to set up a VPN and DMZ solution for a small business. Here is some background and some of their requirements: The is a small business with maybe a dozen servers and another half-dozen workstations. It provides a public web application with a database backend. Cost is a big factor as is a solution that is easy to set up and maintain. 2 physical locations need to be linked via a site-to-site VPN Remote access must be provided via client-to-site VPN for out-of-state contractors (5 or fewer most likely) VPN clients for (3) above need to run on Windows (XP and Win7) and Linux (Ubu (HowTos)