Ing. Alfonso Reyes wrote:

I'm new to the radius Server, We want to use the radius for all the connections on our network, the thing is that we want to allow a group of users to a group of access points, and use the same radius to control our vpn connections.

As far as I understand if we allow anyone on the radius, it will be allowed on all the devices.

Yes.

The question is:

Is there a way to limit the users connections to some devices?

Yes. You put the users in a group, put the NASes into another group, and then check that if both groups apply, the request should be rejected. See "man rlm_passwd" for examples of group configuration. Alan DeKok.