Captive-Portal Identification Using DHCP or Router Advertisements (RAs)
RFC 7710
| Document | Type |
RFC - Proposed Standard
(December 2015; No errata)
Was draft-wkumari-dhc-capport (individual)
|
|
|---|---|---|---|
| Last updated | 2015-12-07 | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Ted Lemon | ||
| Shepherd write-up | Show (last changed 2015-03-25) | ||
| IESG | IESG state | RFC 7710 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Joel Jaeggli | ||
| Send notices to | (None) | ||
| IANA | IANA review state | IANA - Not OK | |
| IANA action state | RFC-Ed-Ack | ||
Internet Engineering Task Force (IETF) W. Kumari
Request for Comments: 7710 Google
Category: Standards Track O. Gudmundsson
ISSN: 2070-1721 CloudFlare
P. Ebersman
Comcast
S. Sheng
ICANN
December 2015
Captive-Portal Identification Using DHCP or Router Advertisements (RAs)
Abstract
In many environments offering short-term or temporary Internet access
(such as coffee shops), it is common to start new connections in a
captive-portal mode. This highly restricts what the customer can do
until the customer has authenticated.
This document describes a DHCP option (and a Router Advertisement
(RA) extension) to inform clients that they are behind some sort of
captive-portal device and that they will need to authenticate to get
Internet access. It is not a full solution to address all of the
issues that clients may have with captive portals; it is designed to
be used in larger solutions. The method of authenticating to and
interacting with the captive portal is out of scope for this
document.
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/rfc7710.
Kumari, et al. Standards Track [Page 1]
RFC 7710 DHCP Captive-Portal December 2015
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.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements notation . . . . . . . . . . . . . . . . . . 3
2. The Captive-Portal Option . . . . . . . . . . . . . . . . . . 3
2.1. IPv4 DHCP Option . . . . . . . . . . . . . . . . . . . . 3
2.2. IPv6 DHCP Option . . . . . . . . . . . . . . . . . . . . 4
2.3. The Captive-Portal IPv6 RA Option . . . . . . . . . . . . 4
3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
4. Security Considerations . . . . . . . . . . . . . . . . . . . 5
5. Normative References . . . . . . . . . . . . . . . . . . . . 6
6. Informative References . . . . . . . . . . . . . . . . . . . 7
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8
1. Introduction
In many environments, users need to connect to a captive-portal
device and agree to an Acceptable Use Policy (AUP) and/or provide
billing information before they can access the Internet. It is
anticipated that the IETF will work on a more fully featured protocol
at some point, to ease interaction with captive portals. Regardless
of how that protocol operates, it is expected that this document will
provide needed functionality because the client will need to know
when it is behind a captive portal and how to contact it.
In order to present users with the payment or AUP pages, the captive-
portal device has to intercept the user's connections and redirect
the user to the captive portal, using methods that are very similar
to man-in-the-middle (MITM) attacks. As increasing focus is placed
on security, and end nodes adopt a more secure stance, these
interception techniques will become less effective and/or more
intrusive.
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