Hiding Transit-only Networks in OSPF
draft-ietf-ospf-prefix-hiding-03

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Last updated 2012-05-01
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OSPF Working Group                                               Y. Yang
Internet-Draft                                             Cisco Systems
Intended status: Standards Track                               A. Retana
Expires: November 2, 2012                            Hewlett-Packard Co.
                                                                  A. Roy
                                                           Cisco Systems
                                                             May 1, 2012

                  Hiding Transit-only Networks in OSPF
                 <draft-ietf-ospf-prefix-hiding-03.txt>

Abstract

   A transit-only network is defined as a network connecting routers
   only.  In OSPF, transit-only networks are usually configured with
   routable IP addresses, which are advertised in Link State
   Advertisements (LSAs) but not needed for data traffic.  In addition,
   remote attacks can be launched against routers by sending packets to
   these transit-only networks.  This document presents a mechanism to
   hide transit-only networks to speed up network convergence and
   minimize remote attack vulnerability.

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
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   This Internet-Draft will expire on November 2, 2012.

 

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Copyright Notice

   Copyright (c) 2010 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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   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

 

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Table of Contents

   1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 3
      1.1. Requirements notation . . . . . . . . . . . . . . . . . . . 3
   2. Hiding IPv4 Transit-only Networks in OSPFv2  . . . . . . . . . . 4
      2.1. Point-to-Point Networks . . . . . . . . . . . . . . . . . . 4
         2.1.1. Advertising Point-to-Point Networks  . . . . . . . . . 4
         2.1.2. Hiding Point-to-Point Networks . . . . . . . . . . . . 5
      2.2. Broadcast Networks  . . . . . . . . . . . . . . . . . . . . 5
         2.2.1. Advertising Broadcast Networks . . . . . . . . . . . . 5
         2.2.2. Hiding Broadcast Networks  . . . . . . . . . . . . . . 6
            2.2.2.1. Sending Network-LSA . . . . . . . . . . . . . . . 6
            2.2.2.2. Receiving Network-LSA . . . . . . . . . . . . . . 6
               2.2.2.2.1. Backward Compatibility . . . . . . . . . . . 6
      2.3. Non-Broadcast Networks  . . . . . . . . . . . . . . . . . . 7
         2.3.1. NBMA . . . . . . . . . . . . . . . . . . . . . . . . . 7
         2.3.2. Point-to-MultiPoint  . . . . . . . . . . . . . . . . . 7
            2.3.2.1. Advertising Point-to-MultiPoint Networks  . . . . 8
            2.3.2.2. Hiding Point-to-MultiPoint Networks . . . . . . . 8
   3. Hiding IPv6 Transit-only Networks in OSPFv3  . . . . . . . . . . 9
   4. Hiding AF Enabled Transit-only Networks in OSPFv3  . . . . . . . 9
   5. Forwarding Address . . . . . . . . . . . . . . . . . . . . . .  10
   6. Virtual Links  . . . . . . . . . . . . . . . . . . . . . . . .  10
   7. Operational Considerations . . . . . . . . . . . . . . . . . .  10
   8. Security Considerations  . . . . . . . . . . . . . . . . . . .  11
   9. IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  11
   10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  11
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
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