Support multiple webservers via one IP address

Imagine a situation where a collection of web servers are protected by one Linux router/firewall as a single point of entry. If the collection has access to multiple external IP addresses, the idea of having 1 to 1 NAT or some other mechanism within the Router to route different IP addresses to different web servers is obvious and easy to setup. However what happens when the collection only has access to one IP address?

Just in case you are wondering why I would want to do this, the answer is testing web software on different environments - running PHP on LAMP, WAMP and WIMP - from a single external source.

All current webservers - Apache, IIS, Nginx and even Node can be configured to respond to virtual hosts, whilst in turn the DNS records at an external Registrar can be configured to support virtual hosting by directing different domains and sub-domains to the given single IP address.

I do not know of way to configure a Linux Router system so that when it is connected to only one external IP address, it has the ability to respond to the Domain or Subdomain name, and route these to collection of web servers (virtual or physical).

I am interested in funding the creation of a module / solution that achieves this requirement. As far as I can see, the Module would take the place of the Webserver on the Linux Router (ideally RHEL 6) and would have the ability to read the Domain and Subdomain and route incoming and outgoing packets to the appropriate webserver. I could visualise achieving this in Node or alternatively in C. Equally this facility may already exist somewhere in Linux and my lack of knowledge has not found it so far. In which case the project is about installation and configuration.

As a small web software developer I am used to producing design specifications which explain the work involved and justify the cost. Thus, anyone who replies to this Contract request without producing such a design specification to support their price, will be ignored.

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