SAVI Solution for DHCP
draft-ietf-savi-dhcp-34

 
Document Type Active Internet-Draft (savi WG)
Last updated 2015-02-20 (latest revision 2015-02-19)
Replaces draft-bi-savi-dhcp
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Intended RFC status Proposed Standard
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Document shepherd Jean-Michel Combes
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Responsible AD Ted Lemon
IESG note Jean-Michel Combes (jeanmichel.combes@gmail.com) is the Document Shepherd.
Send notices to savi-chairs@ietf.org, draft-ietf-savi-dhcp@ietf.org
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Email authors IPR 1 References Referenced by Nits Search lists

Source Address Validation Improvement                              J. Bi
Internet-Draft                                                     J. Wu
Intended status: Standards Track                                  G. Yao
Expires: August 23, 2015                                  Tsinghua Univ.
                                                                F. Baker
                                                                   Cisco
                                                       February 19, 2015

                         SAVI Solution for DHCP
                        draft-ietf-savi-dhcp-34

Abstract

   This document specifies the procedure for creating a binding between
   a DHCPv4/DHCPv6-assigned IP address and a binding anchor on a Source
   Address Validation Improvements (SAVI) device.  The bindings set up
   by this procedure are used to filter packets with forged source IP
   addresses.  This mechanism complements BCP 38 ingress filtering,
   providing finer-grained source IP address validation.

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 August 23, 2015.

Copyright Notice

   Copyright (c) 2015 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

Bi, et al.               Expires August 23, 2015                [Page 1]
Internet-Draft                  SAVI DHCP                  February 2015

   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  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   5
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Deployment Scenario and Configuration . . . . . . . . . . . .   8
     4.1.  Elements and Scenario . . . . . . . . . . . . . . . . . .   8
     4.2.  SAVI Binding Type Attributes  . . . . . . . . . . . . . .  10
       4.2.1.  Trust Attribute . . . . . . . . . . . . . . . . . . .  10
       4.2.2.  DHCP-Trust Attribute  . . . . . . . . . . . . . . . .  11
       4.2.3.  DHCP-Snooping Attribute . . . . . . . . . . . . . . .  11
       4.2.4.  Data-Snooping Attribute . . . . . . . . . . . . . . .  11
       4.2.5.  Validating Attribute  . . . . . . . . . . . . . . . .  12
       4.2.6.  Table of Mutual Exclusions  . . . . . . . . . . . . .  13
     4.3.  Perimeter . . . . . . . . . . . . . . . . . . . . . . . .  13
       4.3.1.  SAVI-DHCP Perimeter Overview  . . . . . . . . . . . .  13
       4.3.2.  SAVI-DHCP Perimeter Configuration Guideline . . . . .  14
       4.3.3.  On the Placement of the DHCP Server and Relay . . . .  15
       4.3.4.  An Alternative Deployment . . . . . . . . . . . . . .  15
       4.3.5.  Considerations regarding Binding Anchors  . . . . . .  16
     4.4.  Other Device Configuration  . . . . . . . . . . . . . . .  17
   5.  Binding State Table (BST) . . . . . . . . . . . . . . . . . .  17
   6.  DHCP Snooping Process . . . . . . . . . . . . . . . . . . . .  18
     6.1.  Rationale . . . . . . . . . . . . . . . . . . . . . . . .  18
     6.2.  Binding States Description  . . . . . . . . . . . . . . .  19
     6.3.  Events  . . . . . . . . . . . . . . . . . . . . . . . . .  19
       6.3.1.  Timer Expiration Event  . . . . . . . . . . . . . . .  19
       6.3.2.  Control Message Arriving Events . . . . . . . . . . .  19
     6.4.  The State Machine of DHCP Snooping Process  . . . . . . .  21
       6.4.1.  Initial State: NO_BIND - No binding has been set up .  21
       6.4.2.  Initial State: INIT_BIND - A potential binding has
               been set up . . . . . . . . . . . . . . . . . . . . .  23
       6.4.3.  Initial State: BOUND - The binding has been set up  .  26
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