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RFC 7821
Title: UDP Checksum Complement in the
Network Time Protocol (NTP)
Author: T. Mizrahi
Status: Experimental
Stream: IETF
Date: March 2016
Mailbox: talmi@marvell.com
Pages: 14
Characters: 26007
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-ntp-checksum-trailer-07.txt
URL: https://www.rfc-editor.org/info/rfc7821
DOI: http://dx.doi.org/10.17487/RFC7821
The Network Time Protocol (NTP) allows clients to synchronize to a
time server using timestamped protocol messages. To facilitate
accurate timestamping, some implementations use hardware-based
timestamping engines that integrate the accurate transmission
time into every outgoing NTP packet during transmission. Since
these packets are transported over UDP, the UDP Checksum field is
then updated to reflect this modification. This document proposes an
extension field that includes a 2-octet Checksum Complement, allowing
timestamping engines to reflect the checksum modification in the last
2 octets of the packet rather than in the UDP Checksum field. The
behavior defined in this document is interoperable with existing NTP
implementations.
This document is a product of the Network Time Protocol 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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