Jade, I don't undestand your question well, but I guess what you want is to have with each server a different IP, so that is all the thing that you need to do, the first server will have the DSL internet connection that will share with the others servers through a hub, so just assign a specific IP to each server and that's it! (configure the dns correctly in each one)
What you need to be shure is to share the internet connection.