The IESG has approved the following document: - 'UDP Checksum Complement in OWAMP and TWAMP' (draft-ietf-ippm-checksum-trailer-06.txt) as Experimental RFC This document is the product of the IP Performance Metrics Working Group. The IESG contact persons are Spencer Dawkins and Martin Stiemerling. A URL of this Internet Draft is: https://datatracker.ietf.org/doc/draft-ietf-ippm-checksum-trailer/ Technical Summary In many IP measurement protocols, timestamps are required to calculate packet transfer delay, and these timestamps occupy fields above the IP layer. When implementers prefer to avoid the delay of stack processing, it is preferred to insert the timestamps as close to the network interface as possible, but this also requires maintaining sanity among checksums and other integrity checks. This memo defines one way to assign an optional field at the end of the UDP payload of test packets to complement the timestamp and populate that field to keep checksum accuracy. Working Group Summary There has been sufficient review during 2 years of development, and the comments were both constructive and supportive of this simple idea. The draft can serve a useful purpose for the industry. Document Quality One chip vendor has implemented the procedure in the draft from a hardware perspective, and another chip vendor has indicated their plans (privately) to do the same. There are no known HW and SW implementations with TWAMP or OWAMP at this time. As far as expert reviews, there was sufficient review from the community of TWAMP experts. Personnel Al Morton is Shepherd, Spencer Dawkins is AD.
