how to test authentication process using Access-Challenge response

[Gregor Bruhin]

Thanks Alan and Peter for your fast answers.

After doing some tests with the suggested tools I found no "ready to 
use" simulator for testing 2 step authentication with challenge response 
messages.

I tried Jradius simulator which also seems not to have this feature.

I will try to code myself something with the suggested libraries and tools.

Thanks, Greg