Does Attribute virtual-server exist?

[Timmy]

Dear All Freeradius Developers and Users,
My servers are running Freeradius v2.2.7 and 2.2.8.

Is there any existing attribute related to virtual_server?

 1. If yes, to which dictionary does it belong?
 2. If no, how do I define it?

I think I am in need of it.  I want to bind each subscriber login ID to
his virtual server, so that if he logs in from other servers to which he
has not subscribed, he will be kicked.

Thanks for your precious opinion in advance.


Yours Faithfully,
Timmy