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UDP Checksum Trailer in OWAMP and TWAMP

Document Type Replaced Internet-Draft (candidate for ippm WG)
Author Tal Mizrahi
Last updated 2014-12-17 (Latest revision 2014-12-14)
Replaces draft-mizrahi-owamp-twamp-checksum-trailer
Replaced by RFC 7820
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
plain text htmlized pdfized bibtex
Stream WG state Call For Adoption By WG Issued
Document shepherd (None)
IESG IESG state Replaced by draft-ietf-ippm-checksum-trailer
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD (None)
Send notices to (None)
This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at:


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 Trailer, 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.


Tal Mizrahi

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)