Multiple Interfaces and Provisioning Domains Problem Statement
RFC 6418
Internet Engineering Task Force (IETF) M. Blanchet
Request for Comments: 6418 Viagenie
Category: Informational P. Seite
ISSN: 2070-1721 France Telecom - Orange
November 2011
Multiple Interfaces and Provisioning Domains Problem Statement
Abstract
This document describes issues encountered by a node attached to
multiple provisioning domains. This node receives configuration
information from each of its provisioning domains, where some
configuration objects are global to the node and others are local to
the interface. Issues such as selecting the wrong interface to send
traffic happen when conflicting node-scoped configuration objects are
received and inappropriately used. Moreover, other issues are the
result of simultaneous attachment to multiple networks, such as
domain selection or addressing and naming space overlaps, regardless
of the provisioning mechanism. While multiple provisioning domains
are typically seen on nodes with multiple interfaces, this document
also discusses situations involving single-interface nodes.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
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). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see 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/rfc6418.
Blanchet & Seite Informational [Page 1]
RFC 6418 Multiple Interfaces Problem Statement November 2011
Copyright Notice
Copyright (c) 2011 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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Table of Contents
1. Introduction ....................................................3
2. Terminology .....................................................4
3. Scope and Existing Work .........................................4
3.1. Interactions Below IP ......................................4
3.2. MIF Node Characterization ..................................5
3.3. Host Requirements ..........................................5
3.4. Mobility and Other IP Protocols ............................6
3.5. Address Selection ..........................................6
3.6. Finding and Sharing IP Addresses with Peers ................7
3.7. Provisioning Domain Selection ..............................7
3.8. Session Management .........................................8
3.9. Sockets API ................................................9
4. MIF Issues ......................................................9
4.1. DNS Resolution Issues ......................................9
4.2. Node Routing ..............................................12
4.3. Conflicting Policies ......................................13
4.4. Session Management ........................................14
4.5. Single Interface on Multiple Provisioning Domains .........14
5. Underlying Problems and Causes .................................15
6. Security Considerations ........................................17
7. Contributors ...................................................18
8. Acknowledgements ...............................................18
9. Informative References .........................................18
Blanchet & Seite Informational [Page 2]
RFC 6418 Multiple Interfaces Problem Statement November 2011
1. Introduction
A multihomed node may have multiple provisioning domains (via
physical and/or virtual interfaces). For example, a node may be
simultaneously connected to a wired Ethernet LAN, an 802.11 LAN, a 3G
cell network, one or multiple VPN connections, or one or multiple
tunnels (automatic or manual). Current laptops and smartphones
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