Discovering Provisioning Domain Names and Data
RFC 8801
Internet Engineering Task Force (IETF) P. Pfister
Request for Comments: 8801 É. Vyncke
Category: Standards Track Cisco
ISSN: 2070-1721 T. Pauly
Apple Inc.
D. Schinazi
Google LLC
W. Shao
Cisco
July 2020
Discovering Provisioning Domain Names and Data
Abstract
Provisioning Domains (PvDs) are defined as consistent sets of network
configuration information. PvDs allows hosts to manage connections
to multiple networks and interfaces simultaneously, such as when a
home router provides connectivity through both a broadband and
cellular network provider.
This document defines a mechanism for explicitly identifying PvDs
through a Router Advertisement (RA) option. This RA option announces
a PvD identifier, which hosts can compare to differentiate between
PvDs. The option can directly carry some information about a PvD and
can optionally point to PvD Additional Information that can be
retrieved using HTTP over TLS.
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 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8801.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Table of Contents
1. Introduction
1.1. Specification of Requirements
2. Terminology
3. Provisioning Domain Identification Using Router Advertisements
3.1. PvD Option for Router Advertisements
3.2. Router Behavior
3.3. Non-PvD-Aware Host Behavior
3.4. PvD-Aware Host Behavior
3.4.1. DHCPv6 Configuration Association
3.4.2. DHCPv4 Configuration Association
3.4.3. Connection Sharing by the Host
3.4.4. Usage of DNS Servers
4. Provisioning Domain Additional Information
4.1. Retrieving the PvD Additional Information
4.2. Operational Consideration to Providing the PvD Additional
Information
4.3. PvD Additional Information Format
4.3.1. Example
4.4. Detecting Misconfiguration and Misuse
5. Operational Considerations
5.1. Exposing Extra RA Options to PvD-Aware Hosts
5.2. Different RAs for PvD-Aware and Non-PvD-Aware Hosts
5.3. Enabling Multihoming for PvD-Aware Hosts
5.4. Providing Additional Information to PvD-Aware Hosts
6. Security Considerations
7. Privacy Considerations
8. IANA Considerations
8.1. Change to IPv6 Neighbor Discovery Option Formats Registry
8.2. New Entry in the Well-Known URIs Registry
8.3. New Additional Information PvD Keys Registry
8.4. New PvD Option Flags Registry
8.5. PvD JSON Media Type Registration
9. References
9.1. Normative References
9.2. Informative References
Acknowledgments
Authors' Addresses
1. Introduction
Provisioning Domains (PvDs) are defined in [RFC7556] as consistent
sets of network configuration information. This information includes
properties that are traditionally associated with a single networking
interface, such as source addresses, DNS configuration, proxy
configuration, and gateway addresses.
Clients that are aware of PvDs can take advantage of multiple network
interfaces simultaneously. This enables using two PvDs in parallel
for separate connections or for multi-path transports.
While most PvDs today are discovered implicitly (such as by receiving
information via Router Advertisements from a router on a network that
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