What you are asking for is a complete analysis and redesign for your business, without giving this consultant much to work with. This is not the type of question that is appropriate for "Ask the Experts." It very much sounds like you need to hire a consultant that understands Business Process Re-engineering, as well as network and security architecture. You probably won't find one person that offers all those skills, so you should look to hire a firm that not only has management consulting skills, but also network engineering skills and network security skills. That way, they can put together a team that can help you the most.
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