Captive-Portal Identification in DHCP and Router Advertisements
RFC 8910, “Captive-Portal Identification in DHCP and Router Advertisements”, is a Proposed Standard document published in September 2020 by W. Kumari, E. Kline. It updates RFC 3679. It obsoletes RFC 7710. The canonical text is published by the RFC Editor.
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 user can do until the user has satisfied the captive portal conditions.
This document describes a DHCPv4 and DHCPv6 option and a Router Advertisement (RA) option to inform clients that they are behind some sort of captive portal enforcement device, and that they will need to satisfy the Captive Portal conditions 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 one component of a standardized approach for hosts to interact with such portals. While this document defines how the network operator may convey the captive portal API endpoint to hosts, the specific methods of satisfying and interacting with the captive portal are out of scope of this document.
This document replaces RFC 7710, which used DHCP code point 160. Due to a conflict, this document specifies 114. Consequently, this document also updates RFC 3679.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 8910 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
- RFC 8909 Registry Data Escrow Specification
- RFC 8908 Captive Portal API
- RFC 8907 The Terminal Access Controller Access-Control System Plus Protocol
- RFC 8906 A Common Operational Problem in DNS Servers: Failure to Communicate
- RFC 8914 Extended DNS Errors
- RFC 8905 The 'payto' URI Scheme for Payments
- RFC 8915 Network Time Security for the Network Time Protocol
- RFC 8904 DNS Whitelist Email Authentication Method Extension