%% You should probably cite rfc7820 instead of this I-D. @techreport{ietf-ippm-checksum-trailer-02, number = {draft-ietf-ippm-checksum-trailer-02}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/draft-ietf-ippm-checksum-trailer/02/}, author = {Tal Mizrahi}, title = {{UDP Checksum Complement in OWAMP and TWAMP}}, pagetotal = 12, year = 2015, month = jul, day = 20, 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.}, }