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I think the question was asked a few years ago and there was no answer then.
Can I make my usual point? These days even Micro$oft, who created the protocol, no longer recommend you use it as its security is easily broken. OpenVPN is a more secure solution and you can assign static IP's. If you require auto-login on start up (so no user/pass authentication, relying on certificates only), this is also easy to set up although not through the ClearOS webconfig. -