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How-to : Integrate Cisco Easy VPN authentication with Microsoft NPS RADIUS on Windows Server 2008 R2

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In this article will go through configuration of Cisco Easy VPN along with Microsoft NPS RADIUS on Windows Server 2008 R2.

Article covers:

  1. Basic information about Cisco Easy VPN
  2. Cisco IOS router configuration for Easy VPN
  3. Windows Server 2008 R2 NPS and RADIUS configuration

Let’s go…

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How-to : L2L IPsec VPN between Cisco ISR 2811 and DrayTek Vigor 2850n

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Whole idea for that article came from real environment. At home I have DrayTek Vigor 2850n as my broadband router (and in fact it is really nice piece of equipment). Same time I’m using some Cisco equipment located in remote Lab for testing purposes. Remote Lab is connected to Intrenet and before to get access to devices and systems located there I was using EzVPN. However, as Lab has Cisco ISR as main router I thought, why not to establish L2L IPsec between my home network and remote Lab. Now, question how to do that. I have DrayTek on one end and Cisco ISR on the other. After few attempts, mis-configurations and troubleshooting it did work quite well in fact. So, here it is.

Here is what needs to be achieved:

Equipment available:

  • Cisco ISR 2811 – on the left side of the diagram – internal network 10.255.0.0/24
  • DrayTek Vigor 2850n – on the right side of the diagram – internal network 10.130.1.0/24

Goal:

  • Establish IPsec VPN Tunnel between Cisco and DrayTek to make communication available between 10.255.0.0/24 and 10.130.1.0/24.

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Simple L2L IPsec VPN on Cisco

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This is simple Lab environment I built when was working on IPsec VPN tunnel between our internal network environment and 3rd party vendor systems. As we had some issues with establishing IPsec communication, to make sure that everything is fine on my side I start replicating live environment in Lab. To build test environment quick I use GNS3 as platform to run Dynamips hypervisor for IOS. That speeds up whole process of preparation and testing.


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