I've spent a fair few hours now trying to get a AAA Radius server working with GNS3, so I thought I'd share my experiences.
Just so you know, I'm using Windows 7.
First off, I installed VirtualBox. You can get this here: Oracle VM VirtualBox
Next, I downloaded Ubuntu Desktop. You can get this here: Download Ubuntu
I created a new VM, with 512MB RAM …Read whole post...