Technical Considerations for Internet Service Blocking and Filtering
draft-iab-filtering-considerations-02

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Replaces draft-barnes-blocking-considerations
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Internet Architecture Board                                    R. Barnes
Internet-Draft                                          BBN Technologies
Intended status: Informational                                 A. Cooper
Expires: August 27, 2013                                             CDT
                                                              O. Kolkman
                                                              NLnet Labs
                                                       February 23, 2013

  Technical Considerations for Internet Service Blocking and Filtering
               draft-iab-filtering-considerations-02.txt

Abstract

   The Internet is structured to be an open communications medium.  This
   openness is one of the key underpinnings of Internet innovation, but
   it can also allow communications that may be viewed as undesirable by
   certain parties.  Thus, as the Internet has grown, so have mechanisms
   to limit the extent and impact of abusive or allegedly illegal
   communications.  Recently, there has been an increasing emphasis on
   "blocking" and "filtering," the active prevention of such
   communications.  This document examines several technical approaches
   to Internet content blocking and filtering in terms of their
   alignment with the overall Internet architecture.  In general, the
   approach to content blocking and filtering that is most coherent with
   the Internet architecture is to inform endpoints about potentially
   undesirable services, so that the communicants can avoid engaging in
   abusive or illegal communications.

Status of this Memo

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   This Internet-Draft will expire on August 27, 2013.

Copyright Notice

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Internet-Draft          Filtering Considerations           February 2013

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Architectural Principles . . . . . . . . . . . . . . . . . . .  4
     2.1.  End-to-End Connectivity and "Transparency" . . . . . . . .  4
     2.2.  Layering . . . . . . . . . . . . . . . . . . . . . . . . .  5
     2.3.  Distribution and Mobility  . . . . . . . . . . . . . . . .  6
     2.4.  Locality and Autonomy  . . . . . . . . . . . . . . . . . .  6
   3.  Examples of Blocking . . . . . . . . . . . . . . . . . . . . .  7
   4.  Blocking Design Patterns . . . . . . . . . . . . . . . . . . .  9
     4.1.  Network-Based Blocking . . . . . . . . . . . . . . . . . . 10
       4.1.1.  Interaction with Architectural Principles  . . . . . . 11
       4.1.2.  Circumvention  . . . . . . . . . . . . . . . . . . . . 11
     4.2.  Infrastructure-Based Blocking  . . . . . . . . . . . . . . 14
     4.3.  Endpoint-Based Blocking  . . . . . . . . . . . . . . . . . 16
   5.  Summary of Trade-offs  . . . . . . . . . . . . . . . . . . . . 18
   6.  Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . 19
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 20
   8.  Informative References . . . . . . . . . . . . . . . . . . . . 21
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 24

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1.  Introduction

   The original design goal of the Internet was to enable communications
   between hosts.  As this goal was met and people started using the
   Internet to communicate, however, it became apparent that some hosts
   were engaging in arguably undesirable communications.  The most
   famous early example of undesirable communications was the Morris
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