On Firewalls in Internet Security
draft-ietf-opsawg-firewalls-00

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Last updated 2012-06-12
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Operations Area Working Group                                   F. Baker
Internet-Draft                                             Cisco Systems
Intended status: BCP                                       June 12, 2012
Expires: December 14, 2012

                   On Firewalls in Internet Security
                     draft-ietf-opsawg-firewalls-00

Abstract

   There is an ongoing discussion regarding the place of firewalls in
   security.  This note is intended to capture and try to make sense out
   of it.

Requirements Language

   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 [RFC2119].

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on December 14, 2012.

Copyright Notice

   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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect

Baker                   Expires December 14, 2012               [Page 1]
Internet-Draft      On Firewalls in Internet Security          June 2012

   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Common kinds of firewalls  . . . . . . . . . . . . . . . . . .  3
     2.1.  Perimeter security: Protection from aliens and
           intruders  . . . . . . . . . . . . . . . . . . . . . . . .  4
     2.2.  Pervasive access control . . . . . . . . . . . . . . . . .  5
     2.3.  Intrusion Management: Contract and Reputation filters  . .  5
   3.  Reasoning about Firewalls  . . . . . . . . . . . . . . . . . .  7
     3.1.  The End-to-End Principle . . . . . . . . . . . . . . . . .  7
     3.2.  Building a communication . . . . . . . . . . . . . . . . .  8
     3.3.  The middle way . . . . . . . . . . . . . . . . . . . . . .  8
   4.  Recommendations  . . . . . . . . . . . . . . . . . . . . . . .  9
   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 10
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 10
   7.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 10
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 11
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 11
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 11

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1.  Introduction

   There is an ongoing discussion regarding the place of firewalls in
   security.  This note is intended to capture and try to make sense out
   of it.

   The IETF has a long and fractured discussion on security.  Many early
   RFCs simply didn't address the topic - and said as much.  When the
   IESG started complaining about that, it was told that there was no
   market interest in the topic that was measurable in money spent.
   Those who *were* interested in the topic set forth frameworks, rules,
   and procedures without necessarily explaining how they would be
   useful in deployment, and dismissed questions as "from those who
   don't understand."  In many cases, as a result, deployments have been
   underwhelming in both quantity and quality, and the Internet is noted
   for its problems with security.  What is clear is that people need to
   think clearly about security, their own and that of others.  What is
   not clear is how to do so in a coherent and scalable manner.

   Prophylactic perimeter security in the form of firewalls, and the
   proper use of them, have been a fractious sub-topic in this area.
   One could compare them to the human skin.  The service that the skin
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