http://www.rfc-editor.org/rfc/rfc4603.txt
RFC 4603: Additional Values for the NAS-Port-Type Attribute, G. Zorn, G. Weber, R. Foltak2006-07-01T23:00:00-00:00This document defines a set of values for the NAS-Port-Type RADIUS Attribute. This memo provides information for the Internet community.