Last Call Review of draft-ietf-ntp-mode-6-cmds-08
review-ietf-ntp-mode-6-cmds-08-secdir-lc-franke-2020-06-13-00

I have reviewed this document as part of the security directorate's ongoing
effort to review all IETF documents being processed by the IESG.  These
comments were written with the intent of improving security requirements and
considerations in IETF drafts.  Comments not addressed in last call may be
included in AD reviews during the IESG review.  Document editors and WG chairs
should treat these comments just like any other last call comments.

This document describes a historic protocol whose design falls far short of
modern IETF standards. Its myriad issues are well-described in the Security
Considerations section.

There has been some debate as to whether the appropriate status for this
document is Historic or Informational. I believe the currently-intended
Historic status is more appropriate. The argument I have heard repeatedly in
favor of Informational status is that it is not appropriate to classify a
protocol as Historic until a better alternative exists with a published
specification. I believe that better alternative exists, which is to have no
standard at all. It's perfectly fine for NTP monitoring and management
protocols to be vendor-specific. In virtually all legitimate uses ("legitimate"
so as to exclude RDoS attacks), both sides of the protocol run on systems
managed by the same organization and the need for vendor-specific tools is not
a practical issue. Lack of standardization is the already the status quo, since
there are many widely-used NTP implementations out there but only the Network
Time Foundation implementation and its derivatives (such as NTPsec) support
this protocol. I know of nobody who has ever been inconvenienced by this;
standardization is a solution in search of a problem.