Network Time Protocol I-Do Extension Field

Document Type Expired Internet-Draft (ntp WG)
Last updated 2018-08-26 (latest revision 2018-02-22)
Stream IETF
Intended RFC status (None)
Expired & archived
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Stream WG state Candidate for WG Adoption
Document shepherd No shepherd assigned
IESG IESG state Expired
Consensus Boilerplate Unknown
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The first implementation of NTPv4 was released in 2003. NTPv4 is defined by RFC 5905 [RFC5905]. It contains a public-key security protocol, Autokey, which is defined by RFC 5906 [RFC5906]. Until very recently, Autokey has been the only defined "user" of NTP packet Extension Fields. New proposals for extension fields are being written and there is currently no convenient way to learn if a remote instance of NTP supports any extension fields or not. This proposal contains a method to tell a remote instance of NTP what we (are willing to admit we) support, and ask what they (are willing to admit they) support.


Harlan Stenn (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)