Cisco 2509 - Router - EN - APPENDIX E Cisco Secure ACS and Virtual Private Dial-up Networks; VPDN Process

E-1
User Guide for Cisco Secure ACS for Windows Server
78-14696-01, Version 3.1
APPENDIX
E
Cisco Secure ACS and Virtual Private
Dial-up Networks
Cisco Secure Access Control Server (Cisco Secure ACS) for Windows Server ve
rsion 3.1 supports authentication forwarding of virtual private dial-up network
(VPDN) requests. There are two basic types of “roaming” users: Internet and
intranet; VPDN addresses the requirements of roaming intranet users. This
chapter provides information about the VPDN process and how it affects the
operation of Cisco Secure ACS.
VPDN Process
This section describes the steps for processing VPDN requests in a standard
environment.
1. A VPDN user dials in to the network access server (NAS) of the regional
service provider (RSP). The standard call/point-to-point protocol (PPP) setup
is done. A username and password are sent to the NAS in the format
username@domain (for example, mary@corporation.us). See Figure E-1.