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CHAPTER 5
Configuring RADIUS Relay Server
RADIUS Relay Server Overview
Copyright © 2010, Juniper Networks, Inc.
This chapter describes the E Series router's RADIUS relay server feature. The RADIUS
relay server provides authentication, authorization, accounting, and addressing services
to wireless subscribers in public areas, such as airports and coffee shops. This chapter
has the following sections:
RADIUS Relay Server Overview on page 241
RADIUS Relay Server Platform Considerations on page 242
RADIUS Relay Server References on page 242
How RADIUS Relay Server Works on page 242
RADIUS Relay Server and the SRC Software on page 244
Configuring RADIUS Relay Server Support on page 245
Monitoring RADIUS Relay Server on page 246
The JunosE RADIUS relay server provides authentication, authorization, accounting, and
addressing services in an 802.1x-based wireless environment.
The IEEE 802.1x standard is an authentication standard for wireless LANs; it enables a
wireless subscriber to be authenticated by a central authority. The standard uses the
Extensible Authentication Protocol (EAP) for message exchange during the authentication
process. The E Series router's RADIUS relay server enhances the 802.1x environment by
including authorization, accounting, and addressing support for wireless subscribers.
Figure 6 on page 242 illustrates a typical 802.1x-based wireless environment. In the figure,
wireless subscribers connect to wireless access points (WAPs) for authentication. The
WAPs in turn connect to the E Series router's RADIUS relay server. The RADIUS relay
server passes the request on to the authentication server, which might be a RADIUS or
TACACS+ server. The RADIUS server authenticates the subscriber, who is then granted
access. After authentication, the RADIUS relay server obtains an IP address for the
subscriber from the Dynamic Host Configuration Protocol (DHCP) local or external server.
The RADIUS relay server can also use the RADIUS server or the optional Session and
Resource Control (SRC) software (formerly the SDX software), to provide the accounting
support.
241
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