I've published a -00 draft proposing two new SvcParams for "ipv6only" and for "deprecated", along with some operational examples for how they might be used together.
Abstract: As the DNS is the primary mechanism for translating from hostnames to IP addresses, it is a logical place to signal that endpoints are IPv6-only. It is thus also a logical place to signal that legacy endpoints supporting IPv4 are being deprecated. This specification introduces two SvcParams for SVCB-compatible RR types that signal IPv6-only endpoints (ipv6only) as well as deprecated endpoints (deprecated). The "ipv6only" SvcParam touches on V6OPS and HAPPY. I see this not as something we desperately need now/yet but as something we will want in a few years and thus should standardize sooner so that the implementations are there for when we need it. The "deprecated" SvcParam is more generally useful. I give some other examples of how it might be used for other purposes as well (eg, for deprecating an http/1.1-only Service Endpoint). I'm still the only author on this, and am happy to talk to people in Vienna if there others interested in joining as co-authors. This idea has been tossed around a number of times while we were authoring RFC 9460 / SVCB (and might have been in some early drafts and I even vaguely recall talking about some precursors to this in sunset4 and in happy). Best, Erik ---------- Forwarded message --------- From: <[email protected]> Date: Mon, Jul 6, 2026 at 5:54 PM Subject: New Version Notification for draft-nygren-dnsop-ipv6only-indicator-00.txt To: Erik Nygren <[email protected]> A new version of Internet-Draft draft-nygren-dnsop-ipv6only-indicator-00.txt has been successfully submitted by Erik Nygren and posted to the IETF repository. Name: draft-nygren-dnsop-ipv6only-indicator Revision: 00 Title: Indicating IPv6-only SVCB Endpoints and IPv4 Deprecation in the DNS Date: 2026-07-06 Group: Individual Submission Pages: 11 URL: https://www.ietf.org/archive/id/draft-nygren-dnsop-ipv6only-indicator-00.txt Status: https://datatracker.ietf.org/doc/draft-nygren-dnsop-ipv6only-indicator/ HTML: https://www.ietf.org/archive/id/draft-nygren-dnsop-ipv6only-indicator-00.html HTMLized: https://datatracker.ietf.org/doc/html/draft-nygren-dnsop-ipv6only-indicator Abstract: As the DNS is the primary mechanism for translating from hostnames to IP addresses, it is a logical place to signal that endpoints are IPv6-only. It is thus also a logical place to signal that legacy endpoints supporting IPv4 are being deprecated. This specification introduces two SvcParams for SVCB-compatible RR types that signal IPv6-only endpoints (ipv6only) as well as deprecated endpoints (deprecated). TO BE REMOVED: This document is being collaborated on in Github at: https://github.com/enygren/draft-nygren-dnsop-ipv6only-indicator (https://github.com/enygren/draft-nygren-dnsop-ipv6only-indicator). The most recent working version of the document, open issues, etc. should all be available there. The authors (gratefully) accept pull requests. The IETF Secretariat
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