Current Practices for Multiple-Interface Hosts
RFC 6419
Internet Engineering Task Force (IETF) M. Wasserman
Request for Comments: 6419 Painless Security, LLC
Category: Informational P. Seite
ISSN: 2070-1721 France Telecom - Orange
November 2011
Current Practices for Multiple-Interface Hosts
Abstract
An increasing number of hosts are operating in multiple-interface
environments. This document summarizes current practices in this
area and describes in detail how some common operating systems cope
with challenges that ensue from this context.
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/rfc6419.
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
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
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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.
Wasserman & Seite Informational [Page 1]
RFC 6419 MIF Current Practices November 2011
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Summary of Current Approaches . . . . . . . . . . . . . . . . 3
2.1. Centralized Connection Management . . . . . . . . . . . . 3
2.2. Per-Application Connection Settings . . . . . . . . . . . 4
2.3. Stack-Level Solutions to Specific Problems . . . . . . . . 4
2.3.1. DNS Resolution Issues . . . . . . . . . . . . . . . . 5
2.3.2. First-Hop Selection . . . . . . . . . . . . . . . . . 5
2.3.3. Address Selection Policy . . . . . . . . . . . . . . . 5
3. Current Practices in Some Operating Systems . . . . . . . . . 6
3.1. Mobile Handset Operating Systems . . . . . . . . . . . . . 6
3.1.1. Nokia S60 3rd Edition, Feature Pack 2 . . . . . . . . 7
3.1.2. Microsoft Windows Mobile and Windows Phone 7 . . . . . 9
3.1.3. RIM BlackBerry . . . . . . . . . . . . . . . . . . . . 10
3.1.4. Google Android . . . . . . . . . . . . . . . . . . . . 11
3.1.5. Qualcomm Brew . . . . . . . . . . . . . . . . . . . . 12
3.1.6. Leadcore Technology Arena . . . . . . . . . . . . . . 13
3.2. Desktop Operating Systems . . . . . . . . . . . . . . . . 14
3.2.1. Microsoft Windows . . . . . . . . . . . . . . . . . . 14
3.2.1.1. First-Hop Selection . . . . . . . . . . . . . . . 14
3.2.1.2. Outbound and Inbound Addresses . . . . . . . . . . 14
3.2.1.3. DNS Configuration . . . . . . . . . . . . . . . . 15
3.2.2. Linux and BSD-Based Operating Systems . . . . . . . . 16
3.2.2.1. First-Hop Selection . . . . . . . . . . . . . . . 16
3.2.2.2. Outbound and Inbound Addresses . . . . . . . . . . 16
3.2.2.3. DNS Configuration . . . . . . . . . . . . . . . . 17
4. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 18
5. Security Considerations . . . . . . . . . . . . . . . . . . . 18
6. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 19
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.1. Normative References . . . . . . . . . . . . . . . . . . . 19
7.2. Informative References . . . . . . . . . . . . . . . . . . 19
Wasserman & Seite Informational [Page 2]
RFC 6419 MIF Current Practices November 2011
1. Introduction
Multiple-interface hosts face several challenges not faced by single-
interface hosts, some of which are described in the multiple
interfaces (MIF) problem statement [RFC6418]. This document
summarizes how current implementations deal with the problems
identified in the MIF problem statement.
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