Hi, OPS-DIR, Authors,

I have reviewed this document as part of the Operational directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written with the intent of improving the operational aspects of the IETF drafts. Comments that are 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 Informational document presents real-world measurement result regarding the extent to which packets with IPv6 extension headers are dropped in the Internet. This document also explains its measurement mechanism. This document is well written. I don't see any major issues from the operations and management perspective. It is almost ready to be published with a couple of minor comments below:

This document assumes all IPv6 packets to all these tested destination are 100% reached. However, this does not clearly state in the document either by text or data in the table. Without this assumption, it is not proven that these packet lose are caused by the attendance of extend headers, or some other aspects. I assume this is only the lack of representation. Otherwise, it would be a major or even fundamental issue for this document.

Unused Reference: RFC1034, RFC4443, RFC4861, RFC5927, RFC6980, RFC7045, RFC7113, and RFC7123.

Best regards,

Sheng