RADIUS Accounting Modifications for Tunnel Protocol Support (RFC2867)
Original Publication Date: 2000-Jun-01
Included in the Prior Art Database: 2000-Sep-13
Internet Society Requests For Comment (RFCs)
G. Zorn: AUTHOR [+3]
This document defines new RADIUS accounting Attributes and new values for the existing Acct-Status-Type Attribute  designed to support the provision of compulsory tunneling in dial-up networks.
Network Working Group G. Zorn
Request for Comments: 2867 Cisco Systems, Inc.
Category: Informational B. Aboba
Updates: 2866 Microsoft Corporation
RADIUS Accounting Modifications for Tunnel Protocol Support
Status of this Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright (C) The Internet Society (2000). All Rights Reserved.
This document defines new RADIUS accounting Attributes and new values
for the existing Acct-Status-Type Attribute  designed to support
the provision of compulsory tunneling in dial-up networks.
Specification of Requirements
In this document, the key words "MAY", "MUST, "MUST NOT", "optional",
"recommended", "SHOULD", and "SHOULD NOT", are to be interpreted as
described in .
Many applications of tunneling protocols such as PPTP  and L2TP
 involve dial-up network access. Some, such as the provision of
secure access to corporate intranets via the Internet, are
characterized by voluntary tunneling: the tunnel is created at the
request of the user for a specific purpose. Other applications
involve compulsory tunneling: the tunnel is created without any
action from the user and without allowing the user any choice in the
matter, as a service of the Internet service provider (ISP).
Typically, ISPs providing a service want to collect data regarding
that service for billing, network planning, etc. One way to collect
usage data in dial-up networks is by means of RADIUS Accounting .
The use of RADIUS Accounting allows dial-up usage data to be
collected at a central location, rather than stored on each NAS.
In order to collect usage data regarding tunneling, new RADIUS
attributes are needed; this document defines these attributes. In
addition, several new values for the Acct-Status-Type attribute are
proposed. Specific recommendations for, and examples of, the
application of this attribute for the L2TP protocol can be found in
2. Implementation Notes
Compulsory tunneling may be part of a package of services provided by
one entity to another. For example, a corporation might contract
with an ISP to provide remote intranet access to its employees via
compulsory tunneling. In this case, the integration of RADIUS and
tunnel protocols allows the ISP and the corporation to synchronize
their accounting activities so that each side receives a record of
the user's resource consumption. This provides the corporation with