Hello,

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DEFAULT Realm != "NULL" NAS-IP-Address := `%{Realm}`

But instead of the expected result, I am observing:

NAS-IP-Address := 255.255.255.255

You are assigning a string value to an attribute that carries an IP address. Sounds like a less-than-perfect idea to me.

Actually, in my situation I know that realm will always be an IP address. However when using the "realm DEFAULT {}" configuration, I want the Realm variable to be set to the IP address, but instead, it appears to be set to the word "DEFAULT". So I am asking what is a way to overcome this bug (or feature, I'm still not sure which it is.)

It doesn't matter if the _string_ in realm happens to look like an IP address (which is a sort of _integer_). It is a different datatype, and assigning different datatypes is generally a bad idea. This is neither a bug nor a feature. It's the way RADIUS works. You could code an explicit cast into the server if you really really want to. But I don't think you do. My suggestion is to use NAS-Identifier: it is a string, and has otherwise a semantics very similar to NAS-IP-Address. You didn't mention why specifically you are forced to use NAS-IP-Address. So if you have no clear reason for that, use the string-based attribute NAS-Identifier. Greetings, Stefan -- Stefan WINTER Stiftung RESTENA - Réseau Téléinformatique de l'Education Nationale et de la Recherche Ingenieur Forschung & Entwicklung 6, rue Richard Coudenhove-Kalergi L-1359 Luxembourg E-Mail: stefan.winter@restena.lu     Tel.:    +352 424409-1 http://www.restena.lu               Fax:      +352 422473