[Ntp] RFC 9109 on Network Time Protocol Version 4: Port Randomization
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Subject: [Ntp] RFC 9109 on Network Time Protocol Version 4: Port Randomization
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A new Request for Comments is now available in online RFC libraries.
RFC 9109
Title: Network Time Protocol Version 4:
Port Randomization
Author: F. Gont,
G. Gont,
M. Lichvar
Status: Standards Track
Stream: IETF
Date: August 2021
Mailbox: fgont@si6networks.com,
ggont@si6networks.com,
mlichvar@redhat.com
Pages: 9
Updates: RFC 5905
I-D Tag: draft-ietf-ntp-port-randomization-08.txt
URL: https://www.rfc-editor.org/info/rfc9109
DOI: 10.17487/RFC9109
The Network Time Protocol (NTP) can operate in several modes. Some
of these modes are based on the receipt of unsolicited packets and
therefore require the use of a well-known port as the local port.
However, in the case of NTP modes where the use of a well-known port
is not required, employing such a well-known port unnecessarily
facilitates the ability of attackers to perform blind/off-path
attacks. This document formally updates RFC 5905, recommending the
use of transport-protocol ephemeral port randomization for those
modes where use of the NTP well-known port is not required.
This document is a product of the Network Time Protocol Working Group of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
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