Technical Considerations for Internet Service Filtering
draft-iab-filtering-considerations-00

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Last updated 2012-10-15
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Network Working Group                                          R. Barnes
Internet-Draft                                          BBN Technologies
Intended status: Informational                                 A. Cooper
Expires: April 18, 2013                                              CDT
                                                              O. Kolkman
                                                              NLnet Labs
                                                        October 15, 2012

        Technical Considerations for Internet Service Filtering
               draft-iab-filtering-considerations-00.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 allow communications that may be viewed as either desirable or
   undesirable by different 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", the active prevention of abusive
   or allegedly illegal communications.  This document examines several
   technical approaches to Internet content blocking in terms of their
   alignment with the overall Internet architecture.  In general, the
   approach to content blocking 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

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on April 18, 2013.

Copyright Notice

Barnes, et al.           Expires April 18, 2013                 [Page 1]
Internet-Draft          Filtering Considerations            October 2012

   Copyright (c) 2012 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  . . . . . . . . . . . . . . . .  5
     2.4.  Locality and Autonomy  . . . . . . . . . . . . . . . . . .  6
   3.  Examples of Blocking . . . . . . . . . . . . . . . . . . . . .  6
   4.  Blocking Design Patterns . . . . . . . . . . . . . . . . . . .  8
     4.1.  Intermediary-Based Blocking  . . . . . . . . . . . . . . .  8
     4.2.  Server-Based Blocking  . . . . . . . . . . . . . . . . . . 11
     4.3.  Endpoint-Based Blocking  . . . . . . . . . . . . . . . . . 13
   5.  Summary of Trade-offs  . . . . . . . . . . . . . . . . . . . . 14
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 16
   7.  Informative References . . . . . . . . . . . . . . . . . . . . 17
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 19

Barnes, et al.           Expires April 18, 2013                 [Page 2]
Internet-Draft          Filtering Considerations            October 2012

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
   worm, which used the Internet to infect many hosts in 1988.  As the
   Internet has evolved into a rich communications medium, so have
   mechanisms to restrict undesirable communications.
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