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RFC 7820
Title: UDP Checksum Complement in the
One-Way Active Measurement Protocol (OWAMP) and
Two-Way Active Measurement Protocol (TWAMP)
Author: T. Mizrahi
Status: Experimental
Stream: IETF
Date: March 2016
Mailbox: talmi@marvell.com
Pages: 15
Characters: 30611
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-ippm-checksum-trailer-06.txt
URL: https://www.rfc-editor.org/info/rfc7820
DOI: http://dx.doi.org/10.17487/RFC7820
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 time 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.
This document is a product of the IP Performance Metrics Working Group of the IETF.
EXPERIMENTAL: This memo defines an Experimental Protocol for the
Internet community. It does not specify an Internet standard of any
kind. Discussion and suggestions for improvement are requested.
Distribution of this memo is unlimited.
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