Routing traffic so that it appears to originate from a single (static) IP address

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http://serverfault.com – We have three sets of computers: clients, a single proxy and multiple servers. The clients (many) want to connect to the servers (many) using TCP on a specific and consistent port. Currently they do this directly. The connections always originate from the clients. And everything is happy and the world is good. However, we would like to introduce a proxy / gateway / router to the equation. The goal is to bind a static IP address to the "proxy" so that the servers see all traffic as originating from a static IP address. The clients make requests to multiple servers using multiple protocols (f (HowTos)