Source Address Validation Improvement (SAVI) Solution for DHCP
RFC 7513
| Document | Type |
RFC - Proposed Standard
(May 2015; No errata)
Was draft-ietf-savi-dhcp (savi WG)
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Replaces | draft-bi-savi-dhcp | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Stream | WG state | WG Document | |
| Document shepherd | Jean-Michel Combes | ||
| Shepherd write-up | Show (last changed 2014-07-23) | ||
| IESG | IESG state | RFC 7513 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Ted Lemon | ||
| IESG note | Jean-Michel Combes (jeanmichel.combes@gmail.com) is the Document Shepherd. | ||
| Send notices to | (None) | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | No IC | ||
Internet Engineering Task Force (IETF) J. Bi
Request for Comments: 7513 J. Wu
Category: Standards Track G. Yao
ISSN: 2070-1721 Tsinghua Univ.
F. Baker
Cisco
May 2015
Source Address Validation Improvement (SAVI) Solution for DHCP
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 Improvement (SAVI) device. The bindings set up by
this procedure are used to filter packets with forged source IP
addresses. This mechanism complements BCP 38 (RFC 2827) ingress
filtering, providing finer-grained source IP address validation.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc7513.
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
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.
Bi, et al. Standards Track [Page 1]
RFC 7513 SAVI DHCP May 2015
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 . . . . . . . . . . . . . . . 21
6.4.2. Initial State: INIT_BIND . . . . . . . . . . . . . . 24
6.4.3. Initial State: BOUND . . . . . . . . . . . . . . . . 27
6.4.4. Table of State Machine . . . . . . . . . . . . . . . 30
7. Data Snooping Process . . . . . . . . . . . . . . . . . . . . 31
7.1. Scenario . . . . . . . . . . . . . . . . . . . . . . . . 31
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