datatracker.ietf.org
Sign in
Version 5.9.0, 2014-12-18
Report a bug

SAVI Solution for DHCP
draft-ietf-savi-dhcp-30

Document type: Active Internet-Draft (savi WG)
Document stream: IETF
Last updated: 2014-12-03
Intended RFC status: Proposed Standard
Other versions: plain text, pdf, html

IETF State: WG Document
Consensus: Yes
Document shepherd: Jean-Michel Combes
Shepherd Write-Up: Last changed 2014-07-23

IESG State: IESG Evaluation
IANA Action State: None
(Needs a YES. Needs 8 more YES or NO OBJECTION positions to pass.)
Responsible AD: Ted Lemon
IESG Note: Jean-Michel Combes (jeanmichel.combes@gmail.com) is the Document Shepherd.
Send notices to: savi-chairs@tools.ietf.org, draft-ietf-savi-dhcp@tools.ietf.org

Source Address Validation Improvement                              J. Bi
Internet-Draft                                                     J. Wu
Intended status: Standards Track                                  G. Yao
Expires: June 6, 2015                                     Tsinghua Univ.
                                                                F. Baker
                                                                   Cisco
                                                        December 3, 2014

                         SAVI Solution for DHCP
                        draft-ietf-savi-dhcp-30

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
   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 June 6, 2015.

Copyright Notice

   Copyright (c) 2014 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 June 6, 2015                  [Page 1]
Internet-Draft                  SAVI DHCP                  December 2014

   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.  Requirements Language . . . . . . . . . . . . . . . . . . . .   5
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Deployment Scenario and Configuration . . . . . . . . . . . .   8
     4.1.  Elements and Scenario . . . . . . . . . . . . . . . . . .   8
     4.2.  SAVI Binding Type Attributes  . . . . . . . . . . . . . .   9
       4.2.1.  Trust Attribute . . . . . . . . . . . . . . . . . . .   9
       4.2.2.  DHCP-Trust Attribute  . . . . . . . . . . . . . . . .  10
       4.2.3.  DHCP-Snooping Attribute . . . . . . . . . . . . . . .  10
       4.2.4.  Data-Snooping Attribute . . . . . . . . . . . . . . .  11
       4.2.5.  Validating Attribute  . . . . . . . . . . . . . . . .  11
       4.2.6.  Table of Mutual Exclusions  . . . . . . . . . . . . .  12
     4.3.  Perimeter . . . . . . . . . . . . . . . . . . . . . . . .  12
       4.3.1.  SAVI-DHCP Perimeter Overview  . . . . . . . . . . . .  12
       4.3.2.  SAVI-DHCP Perimeter Configuration Guideline . . . . .  13
       4.3.3.  On the Placement of the DHCP Server and Relay . . . .  14
       4.3.4.  An Alternative Deployment . . . . . . . . . . . . . .  14
       4.3.5.  Considerations regarding Binding Anchors  . . . . . .  15
     4.4.  Other Device Configuration  . . . . . . . . . . . . . . .  16
   5.  Binding State Table (BST) . . . . . . . . . . . . . . . . . .  16
   6.  DHCP Snooping Process . . . . . . . . . . . . . . . . . . . .  17
     6.1.  Rationale . . . . . . . . . . . . . . . . . . . . . . . .  17
     6.2.  Binding States Description  . . . . . . . . . . . . . . .  18
     6.3.  Events  . . . . . . . . . . . . . . . . . . . . . . . . .  18
       6.3.1.  Timer Expiration Event  . . . . . . . . . . . . . . .  18
       6.3.2.  Control Message Arriving Events . . . . . . . . . . .  18
     6.4.  The State Machine of DHCP Snooping Process  . . . . . . .  20
       6.4.1.  Initial State: NO_BIND - No binding has been set up .  20
       6.4.2.  Initial State: INIT_BIND - A potential binding has
               been set up . . . . . . . . . . . . . . . . . . . . .  22
       6.4.3.  Initial State: BOUND - The binding has been set up  .  25

[include full document text]