Acces internal host from a subdomain of an external dns

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http://serverfault.com – Hy to all this image contains the topology i want to make it work. I have a linux server that is used for hosting websites and also routing for our internal network. How can i acces the internal server that hosts the team foundation server from outside, from a domain like teamfoundation.example.com. The parent domain is hosted on the linux machine, is there anyway to NAT the dns queries to the windows server? |LINUX SERVER| example.com | | Windows (HowTos)