A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Network Time Protocol Working Group of the IETF.
Title : Using UDP Checksum Trailers in the Network Time Protocol (NTP)
Author : Tal Mizrahi
Filename : draft-ietf-ntp-checksum-trailer-00.txt
Pages : 10
Date : 2014-07-20
Abstract:
The Network Time Protocol (NTP) allows clients to synchronize to a
time server using timestamped protocol messages. To faciliate
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 Trailer, 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.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ntp-checksum-trailer/
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-ietf-ntp-checksum-trailer-00
Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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