TCP Extended Statistics MIB
RFC 4898

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Network Working Group                                          M. Mathis
Request for Comments: 4898                                    J. Heffner
Category: Standards Track               Pittsburgh Supercomputing Center
                                                         R. Raghunarayan
                                                           Cisco Systems
                                                                May 2007

                      TCP Extended Statistics MIB

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The IETF Trust (2007).

Abstract

   This document describes extended performance statistics for TCP.
   They are designed to use TCP's ideal vantage point to diagnose
   performance problems in both the network and the application.  If a
   network-based application is performing poorly, TCP can determine if
   the bottleneck is in the sender, the receiver, or the network itself.
   If the bottleneck is in the network, TCP can provide specific
   information about its nature.

Table of Contents

   1. Introduction ....................................................2
   2. The Internet-Standard Management Framework ......................2
   3. Overview ........................................................2
      3.1. MIB Initialization and Persistence .........................4
      3.2. Relationship to TCP Standards ..............................4
      3.3. Diagnosing SYN-Flood Denial-of-Service Attacks .............6
   4. TCP Extended Statistics MIB .....................................7
   5. Security Considerations ........................................69
   6. IANA Considerations ............................................70
   7. Normative References ...........................................70
   8. Informative References .........................................72
   9. Contributors ...................................................73
   10. Acknowledgments ...............................................73

Mathis, et al.              Standards Track                     [Page 1]
RFC 4898              TCP Extended Statistics MIB               May 2007

1.  Introduction

   This document describes extended performance statistics for TCP.
   They are designed to use TCP's ideal vantage point to diagnose
   performance problems in both the network and the application.  If a
   network-based application is performing poorly, TCP can determine if
   the bottleneck is in the sender, the receiver, or the network itself.
   If the bottleneck is in the network, TCP can provide specific
   information about its nature.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED",  "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119.

   The Simple Network Management Protocol (SNMP) objects defined in this
   document extend TCP MIB, as specified in RFC 4022 [RFC4022].  In
   addition to several new scalars and other objects, it augments two
   tables and makes one clarification to RFC 4022.  Existing management
   stations for the TCP MIB are expected to be fully compatible with
   these clarifications.

2.  The Internet-Standard Management Framework

   For a detailed overview of the documents that describe the current
   Internet-Standard Management Framework, please refer to section 7 of
   RFC 3410 [RFC3410].

   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB.  MIB objects are generally
   accessed through the Simple Network Management Protocol (SNMP).
   Objects in the MIB are defined using the mechanisms defined in the
   Structure of Management Information (SMI).  This memo specifies a MIB
   module that is compliant to the SMIv2, which is described in STD 58,
   RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580
   [RFC2580].

3.  Overview

   The TCP-ESTATS-MIB defined in this memo consists of two groups of
   scalars, seven tables, and two notifications:

   *  The first group of scalars contain statistics of the TCP protocol
      engine not covered in RFC 4022.  This group consists of the single
      scalar tcpEStatsListenerTableLastChange, which provides management
      stations with an easier mechanism to validate their listener
      caches.

Mathis, et al.              Standards Track                     [Page 2]
RFC 4898              TCP Extended Statistics MIB               May 2007

   *  The second group of scalars consist of knobs to enable and disable
      information collection by the tables containing connection-related