I have one ip, but multiple domain names. Anyway to use nat to determine what domain name someone browses to, and based on that send it to a seperate ip on the internal network?
I am assuming this is for HTTP requests? If not then what services are you looking to forward? As long as your DNS records point to your single external IP then what Burt suggested will work for different services.
However, if you want to host multiple services using the same port (like 80), you will need to have a device that can perform application level header inspection. For example, the device can examine the header content and route packets as follows:
Website(GET request) Public IP Private IP
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