Cisco IOS VPN – PPTP & L2TP + NAT with Microsoft Active Directory

I've been playing with a Cisco 2600 router to configure VPN over PPTP or L2TP with Microsoft Active Directory. I tried both configurations because PPTP is faster than L2TP, but L2TP is a lot more secure. I strongly recommend not to deploy PPTP with the configuration below in a production environment because typical Active Directory passwords are insecure and very easy to break via a simple brute force attack.

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