The IESG has received a request from the IP Performance Metrics WG (ippm) to consider the following document: - 'UDP Checksum Complement in OWAMP and TWAMP' <draft-ietf-ippm-checksum-trailer-03.txt> as Informational RFC The IESG plans to make a decision in the next few weeks, and solicits final comments on this action. Please send substantive comments to the ietf@ietf.org mailing lists by 2015-10-28. Exceptionally, comments may be sent to iesg@ietf.org instead. In either case, please retain the beginning of the Subject line to allow automated sorting. Abstract The One-Way Active Measurement Protocol (OWAMP) and the Two-Way Active Measurement Protocol (TWAMP) are used for performance monitoring in IP networks. Delay measurement is performed in these protocols by using timestamped test packets. Some implementations use hardware-based timestamping engines that integrate the accurate transmission timestamp into every outgoing OWAMP/TWAMP test packet during transmission. Since these packets are transported over UDP, the UDP checksum field is then updated to reflect this modification. This document proposes to use the last 2 octets of every test packet as a Checksum Complement, allowing timestamping engines to reflect the checksum modification in the last 2 octets rather than in the UDP checksum field. The behavior defined in this document is completely interoperable with existing OWAMP/TWAMP implementations. The file can be obtained via https://datatracker.ietf.org/doc/draft-ietf-ippm-checksum-trailer/ IESG discussion can be tracked via https://datatracker.ietf.org/doc/draft-ietf-ippm-checksum-trailer/ballot/ The following IPR Declarations may be related to this I-D: https://datatracker.ietf.org/ipr/2370/
