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ACS 4.2 and RADIUS to an external site

I've got a pair of Cisco ACS 4.2 servers running on our corporate LAN. Currently they are doing TACACS+ for the network gear, and wireless authentications for internal users.

We have contracted with an external web site for an application - They can run RADIUS from their site to our LAN for the user authentications. How can I best do this?

1. NAT the traffic on my ASA firewalls to the internal servers, send the RADIUS traffic to/from the external site?

2. Is this secure?

3. Should I have a RADIUS server in the DMZ instead?

4. Any issues with doing this on ACS 4.2?

Thanks for any help you can offer.

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