Approaches to Address the Availability of Information in Criminal Investigations Involving Large-Scale IP Address Sharing Technologies
draft-daveor-cgn-logging-01

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Last updated 2017-11-08 (latest revision 2017-10-19)
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Internet Engineering Task Force                              D. O'Reilly
Internet-Draft                                          October 19, 2017
Intended status: Informational
Expires: April 22, 2018

   Approaches to Address the Availability of Information in Criminal
  Investigations Involving Large-Scale IP Address Sharing Technologies
                      draft-daveor-cgn-logging-01

Abstract

   The use of large-scale IP address sharing technologies (commonly
   known as "Carrier-Grade NAT" and "A+P") presents a challenge for law
   enforcement agencies due to the fact that incoming source port
   information is not routinely logged by Internet-facing servers.  The
   absence of this information means that it is becoming increasingly
   difficult for law enforcement agencies to identify suspects in
   criminal activity online.  This document considers the reasons why
   source port information is not routinely logged by Internet-facing
   servers and proposes some immediate-term actions that can be taken to
   help improve the situation.  A deployment maturity model has been
   developed and a study of the support for logging incoming source port
   information in common server software is also presented.

Status of This Memo

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Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

O'Reilly                 Expires April 22, 2018                 [Page 1]
Internet-Draft Logging for Large-Scale IP Address Sharing   October 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Centralised Connection Logging  . . . . . . . . . . . . . . .   5
   4.  Challenges to Capturing Source Port . . . . . . . . . . . . .   7
     4.1.  Lack of Awareness . . . . . . . . . . . . . . . . . . . .   7
     4.2.  Lack of Support for Logging Source Port . . . . . . . . .   8
     4.3.  Additional Storage Requirements . . . . . . . . . . . . .   8
     4.4.  Default Log Formats . . . . . . . . . . . . . . . . . . .   8
     4.5.  Breaking Existing Tooling . . . . . . . . . . . . . . . .   8
     4.6.  Accuracy of Recorded Time . . . . . . . . . . . . . . . .   9
   5.  Comparison Model  . . . . . . . . . . . . . . . . . . . . . .   9
   6.  Support for Logging Source Port . . . . . . . . . . . . . . .  10
   7.  Conclusions and Next Steps  . . . . . . . . . . . . . . . . .  11
     7.1.  Raise Awareness of the Importance of Logging Source Port   11
     7.2.  Increase Support for Logging Source Port  . . . . . . . .  12
     7.3.  Update Default Log Formats  . . . . . . . . . . . . . . .  12
     7.4.  Parallel Logging to a Connection Log  . . . . . . . . . .  12
     7.5.  Adequate Timestamp Accuracy in Logs . . . . . . . . . . .  12
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     10.1.  Informative References . . . . . . . . . . . . . . . . .  13
     10.2.  Normative References . . . . . . . . . . . . . . . . . .  14
   Appendix A.  Support for Source Port Logging in Various Server
                Software . . . . . . . . . . . . . . . . . . . . . .  16
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   Large-scale IP address sharing technologies (often collectively
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