Technical Considerations for Internet Service Blocking and Filtering
draft-iab-filtering-considerations-05

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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: June 28, 2014                                             Cisco
                                                              O. Kolkman
                                                              NLnet Labs
                                                       December 25, 2013

  Technical Considerations for Internet Service Blocking and Filtering
               draft-iab-filtering-considerations-05.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 objectionable
   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 blocking and filtering in terms of their alignment with
   the overall Internet architecture.  In general, the approach to
   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
   objectionable 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 June 28, 2014.

Barnes, et al.            Expires June 28, 2014                 [Page 1]
Internet-Draft          Filtering Considerations           December 2013

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Filtering Examples  . . . . . . . . . . . . . . . . . . . . .   4
   3.  Characteristics of Blocking Systems . . . . . . . . . . . . .   6
     3.1.  Entities that set blocking policies . . . . . . . . . . .   6
     3.2.  Purposes of blocking  . . . . . . . . . . . . . . . . . .   6
     3.3.  Intended targets of blocking  . . . . . . . . . . . . . .   7
     3.4.  Components used for blocking  . . . . . . . . . . . . . .   7
   4.  Evaluation of Blocking Design Patterns  . . . . . . . . . . .   9
     4.1.  Criteria for evaluation . . . . . . . . . . . . . . . . .   9
       4.1.1.  Scope: What content or services can be blocked? . . .   9
       4.1.2.  Granularity: How specific is the blocking?  Will
               blocking one service also block others? . . . . . . .  10
       4.1.3.  Efficacy: How easy is it for a resource or service to
               avoid being blocked?  . . . . . . . . . . . . . . . .  11
       4.1.4.  Security: How does the blocking impact existing trust
               infrastructures?  . . . . . . . . . . . . . . . . . .  11
     4.2.  Network-Based Blocking  . . . . . . . . . . . . . . . . .  12
       4.2.1.  Scope . . . . . . . . . . . . . . . . . . . . . . . .  12
       4.2.2.  Granularity . . . . . . . . . . . . . . . . . . . . .  13
       4.2.3.  Efficacy and security . . . . . . . . . . . . . . . .  13
       4.2.4.  Summary . . . . . . . . . . . . . . . . . . . . . . .  15
     4.3.  Rendezvous-Based Blocking . . . . . . . . . . . . . . . .  16
       4.3.1.  Scope . . . . . . . . . . . . . . . . . . . . . . . .  16
       4.3.2.  Granularity . . . . . . . . . . . . . . . . . . . . .  17
       4.3.3.  Efficacy  . . . . . . . . . . . . . . . . . . . . . .  17
       4.3.4.  Security and other implications . . . . . . . . . . .  17
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