RFC 2607 (rfc2607) - Page 2 of 15

Proxy Chaining and Policy Implementation in Roaming

RFC 2607          Proxy Chaining and Policy in Roaming         June 1999


   RADIUS proxy
      In order to provide for the routing of RADIUS authentication and
      accounting requests, a RADIUS proxy can be employed. To the NAS,
      the RADIUS proxy appears to act as a RADIUS server, and to the
      RADIUS server, the proxy appears to act as a RADIUS client.

   Network Access Identifier
      In order to provide for the routing of RADIUS authentication and
      accounting requests, the userID field used in PPP (known as the
      Network Access Identifier or NAI) and in the subsequent RADIUS
      authentication and accounting requests, can contain structure.
      This structure provides a means by which the RADIUS proxy will
      locate the RADIUS server that is to receive the request. The NAI
      is defined in [6].

   Roaming relationships
      Roaming relationships include relationships between companies and
      ISPs, relationships among peer ISPs within a roaming association,
      and relationships between an ISP and a roaming consortia.
      Together, the set of relationships forming a path between a local
      ISP's authentication proxy and the home authentication server is
      known as the roaming relationship path.

3.  Requirements language

   In this document, the key words "MAY", "MUST, "MUST NOT", "optional",
   "recommended", "SHOULD", and "SHOULD NOT", are to be interpreted as
   described in [5].

4.  Introduction

   Today, as described in [1], proxy chaining is widely deployed for the
   purposes of providing roaming services. In such systems,
   authentication/authorization and accounting packets are routed
   between a NAS device and a home server through a series of proxies.
   Consultation of the home server is required for password-based
   authentication, since the home server maintains the password database
   and thus it is necessary for the NAS to communicate with the home
   authentication server in order to verify the user's identity.












Aboba & Vollbrecht           Informational