Source-Address-Dependent Routing and Source Address Selection for IPv6 Hosts: Overview of the Problem Space
RFC 8043
| Document | Type |
RFC - Informational
(January 2017; No errata)
Was draft-sarikaya-6man-sadr-overview (individual)
|
|
|---|---|---|---|
| Last updated | 2018-12-20 | ||
| Stream | ISE | ||
| Formats | plain text pdf htmlized bibtex | ||
| IETF conflict review | conflict-review-sarikaya-6man-sadr-overview | ||
| Stream | ISE state | Published RFC | |
| Consensus Boilerplate | Unknown | ||
| Document shepherd | Adrian Farrel | ||
| Shepherd write-up | Show (last changed 2016-08-15) | ||
| IESG | IESG state | RFC 8043 (Informational) | |
| Telechat date | |||
| Responsible AD | (None) | ||
| Send notices to | "Nevil Brownlee" <rfc-ise@rfc-editor.org> | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | No IANA Actions | ||
Independent Submission B. Sarikaya
Request for Comments: 8043 Huawei USA
Category: Informational M. Boucadair
ISSN: 2070-1721 Orange
January 2017
Source-Address-Dependent Routing and Source Address Selection
for IPv6 Hosts: Overview of the Problem Space
Abstract
This document presents the source-address-dependent routing (SADR)
problem space from the host's perspective. Both multihomed hosts and
hosts with multiple interfaces are considered. Several network
architectures are presented to illustrate why source address
selection and next-hop resolution are needed in view of
source-address-dependent routing.
The document is scoped on identifying a set of scenarios for
source-address-dependent routing from the host's perspective and
analyzing a set of solutions to mitigate encountered issues. The
document does not make any solution recommendations.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This is a contribution to the RFC Series, independently of any other
RFC stream. The RFC Editor has chosen to publish this document at
its discretion and makes no statement about its value for
implementation or deployment. Documents approved for publication by
the RFC Editor are not a candidate for any level of Internet
Standard; see Section 2 of RFC 7841.
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/rfc8043.
Sarikaya & Boucadair Informational [Page 1]
RFC 8043 Source-Address-Dependent-Routing January 2017
Copyright Notice
Copyright (c) 2017 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.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Overall Context . . . . . . . . . . . . . . . . . . . . . 3
1.2. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Source-Address-Dependent Routing (SADR) Scenarios . . . . . . 4
2.1. Multi-Prefix Multihoming . . . . . . . . . . . . . . . . 5
2.2. Multi-Prefix Multi-Interface . . . . . . . . . . . . . . 5
2.3. Home Network (Homenet) . . . . . . . . . . . . . . . . . 7
2.4. Service-Specific Egress Routing . . . . . . . . . . . . . 7
3. Analysis of Source-Address-Dependent Routing . . . . . . . . 8
3.1. Scenarios Analysis . . . . . . . . . . . . . . . . . . . 8
3.2. Provisioning Domains and SADR . . . . . . . . . . . . . . 10
4. Discussion of Alternate Solutions . . . . . . . . . . . . . . 11
4.1. Router Advertisement Option . . . . . . . . . . . . . . . 11
4.2. Router Advertisement Option Set . . . . . . . . . . . . . 12
4.3. Rule 5.5 for Source Address Selection . . . . . . . . . . 12
5. Security Considerations . . . . . . . . . . . . . . . . . . . 13
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.1. Normative References . . . . . . . . . . . . . . . . . . 13
6.2. Informative References . . . . . . . . . . . . . . . . . 14
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 15
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 16
Sarikaya & Boucadair Informational [Page 2]
RFC 8043 Source-Address-Dependent-Routing January 2017
1. Introduction
1.1. Overall Context
BCP 38 recommends ingress traffic filtering to prohibit Denial-of-
Service (DoS) attacks. As such, datagrams with source addresses that
do not match with the network where the host is attached are
discarded [RFC2827]. Preventing packets from being dropped due to
ingress filtering is difficult, especially in multihomed networks
where the host receives more than one prefix from the networks it is
connected to, and consequently may have more than one source address.
Based on BCP 38, BCP 84 introduced recommendations on the routing
system for multihomed networks [RFC3704].
Recommendations on the routing system for ingress filtering such as
in BCP 84 inevitably involve source address checks. This leads to
source-address-dependent-routing (SADR). Source-address-dependent
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