RTFM: Applicability Statement
RFC 2721

Document Type RFC - Informational (October 1999; No errata)
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Network Working Group                                        N. Brownlee
Request for Comments: 2721                    The University of Auckland
Category: Informational                                     October 1999

                     RTFM: Applicability Statement

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 Notice

   Copyright (C) The Internet Society (1999).  All Rights Reserved.

Abstract

   This document provides an overview covering all aspects of Realtime
   Traffic Flow Measurement, including its area of applicability and its
   limitations.

Table of Contents

   1  The RTFM Documents . . . . . . . . . . . . . . . . . . . . . .  2
   2  Brief Technical Specification (TS) . . . . . . . . . . . . . .  3
   3  Applicability Statement (AS) . . . . . . . . . . . . . . . . .  3
   4  Limitations  . . . . . . . . . . . . . . . . . . . . . . . . .  4
   5  Security Considerations  . . . . . . . . . . . . . . . . . . .  5
   6  Policy Considerations  . . . . . . . . . . . . . . . . . . . .  6
   7  Soundness  . . . . . . . . . . . . . . . . . . . . . . . . . .  6
   8  Appendix A: WG Report on the Meter MIB . . . . . . . . . . . .  8
   9  References . . . . . . . . . . . . . . . . . . . . . . . . . .  9
   10 Author's Address . . . . . . . . . . . . . . . . . . . . . . .  9
   11 Full Copyright Statement . . . . . . . . . . . . . . . . . . . 10

Brownlee                     Informational                      [Page 1]
RFC 2721             RTFM: Applicability Statement          October 1999

1  The RTFM Documents

   The RTFM Traffic Measurement System has been developed by the
   Realtime Traffic Flow Measurement Working Group.  It is described in
   six other documents, as follows:

   [ACT-BKG] Internet Accounting: Background             (Informational)

      Sets out the requirements for a usage reporting system for network
      traffic.  Sketches out the RTFM Architecture (meters, meter
      readers and managers) allowing for multiple meters and meter
      readers, with asynchronous reading from the meters.  Proposes
      methods of classifying traffic flows, the need for flows to be
      bi-directional (with separate sets of counters for each direction)
      and the need for each packet to be counted in a single flow (the '
      count in one bucket' principle).

   [RTFM-ARC] RTFM Architecture                          (Informational)

      Defines the RTFM Architecture, giving descriptions of each
      component.  Explains how traffic flows are viewed as logical
      entities described in terms of their address-attribute values, so
      that each is defined by the attributes of its end-points.  Gives a
      detailed description of the RTFM traffic meter, with full details
      of how flows are stored in the meter's flow table, and how packets
      are matched in accordance with rules stored in a ruleset.

   [RTFM-MIB] RTFM Meter MIB                         (Proposed Standard)

      Describes the SNMP Management Information Base for an RTFM meter,
      including its flow table, rule table (storing the meter's
      rulesets) and the control tables used for managing a meter and
      reading flow data from it.

   [RTFM-SRL] SRL: A Language for Describing Traffic     (Informational)
              Flows and Specifying Actions for Flow Groups

      An RTFM ruleset is an array of rules, used by the meter to decide
      which flows are of interest, which end-point is the flow source,
      and how much detail (i.e. what attribute values) must be saved for
      each flow.  SRL is a high-level language providing a clear,
      logical way to write rulesets.  It should also be useful for other
      applications which select flows and perform actions upon them,
      e.g. packet-marking gateways, RSVP policy agents, etc.

Brownlee                     Informational                      [Page 2]
RFC 2721             RTFM: Applicability Statement          October 1999

   [RTFM-NEW] RTFM New Attributes                         (Experimental)

      There has been considerable interest from users in extending the
      RTFM Architecture so as to allow a meter to report on an increased
      number of flow-related measures.  This RFC documents work on
      specifying such measures (the 'new' attributes) and reports on
      experience of implementing them.

   [RTFM-NTM] RTFM: Experiences with NeTraMet            (Informational)

      NeTraMet is a free software implementation of the RTFM
      Architecture which has been available since 1993.  This RFC
      records RTFM implementation experience gained with NeTraMet up to
      late 1996.  One particularly important result is the realisation
      that groups of rules which test the same attribute using the same
      mask can be implemented as a single hashed comparison, allowing
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