Is there some syntax or rules should I follow?

[luis ramiro ochoa torres]

Description of my Operating system:

Ubuntu 9.10
Version 2.1.10. tar.gz of freeradius

in the user file and remove some comments to add users, I've put everything
you need, just do not know how to declare the MAC addresses to access let me
alone with them, apart from the IP
Is there some syntax or rules should I follow?
What I can do about it?

I hope to be concrete and someone can help me
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