[ippm] draft-ietf-ippm-capacity-protocol-16 telechat Perfmetrdir review

[Giuseppe Fioccola via Datatracker <[e-mail]>]

Document: draft-ietf-ippm-capacity-protocol
Title: Test Protocol for One-way IP Capacity Measurement
Reviewer: Giuseppe Fioccola
Review result: Has Issues

This document specifies the UDP Speed Test Protocol (UDPSTP) which enables
network capacity measurements, as defined by RFC 9097. While I found the
document useful and well-written, it left me with some questions.

>From a PERFMETRDIR point of view, I think that some clarification would be
helpful, in particular:

- In the Introduction, it is mentioned that this new protocol supports
measurement features which were not available by standard measurement
protocols, such as OWAMP, TWAMP, STAMP etc. For sake of clarity, it would be
good to clarify the motivation and explain why you chose to design a new
protocol instead of extending existing tools to implement the capacity
measurement.

- In section 2, I think it is necessary to specify better the applicability. I
guess the method can be applied in different scenarios, e.g. controlled domain
or connection over the internet. I would highlight the different aspects,
especially in terms of security, based on the application.

- Section 4.2 and section 2 could be related. If section 2 will be improved by
adding the possible applicability scenarios, the different security mode
operations of section 4.2 can be linked to those scenarios.

- In section 6.2.1, it is mentioned that the server has the option to modify
the request made by the client. If I have understood correctly looking at
section 6.3, when the client receives the response it can only accept the test
parameters modified by the server and the negotiation ends, right? I suggest to
make it clearer.

- Since section 9 is quite short, I would suggest to incorporate its content
elsewhere in the document, maybe in section 2. Therefore, section 9.1 can
become section 9 or moved too.