Hi! I am doing this review as part of the Security Directorate.

This I-D updates NTP v4 [RFC 5095] to recommend the use of transport-protocol ephemeral port randomization for those modes where use of the NTP well-known port is not required. The port randomization recommendation is based on BCP 156 [RFC6056], which recommends the randomization of transport-protocol ephemeral ports. This I-D is in fact co-authored by one of the co-authors of BCP 156. The I-D motivates the recommendation and enumerates some considerations as they relate to NTP as well as identifies the exact changes (i.e., two-sentence dstport replaced with more text). It also appears that this I-D is well implemented as noted in the implementation status section.