[Ntp] I-D Action: draft-ietf-ntp-port-randomization-07.txt

internet-drafts@ietf.org Fri, 11 June 2021 04:46 UTC

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Subject: [Ntp] I-D Action: draft-ietf-ntp-port-randomization-07.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Network Time Protocol WG of the IETF.

        Title           : Port Randomization in the Network Time Protocol Version 4
        Authors         : Fernando Gont
                          Guillermo Gont
                          Miroslav Lichvar
	Filename        : draft-ietf-ntp-port-randomization-07.txt
	Pages           : 11
	Date            : 2021-06-10

   The Network Time Protocol 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
   number.  However, in the case of NTP modes where the use of a well-
   known port is not required, employing such well-known port
   unnecessarily facilitates the ability of attackers to perform blind/
   off-path attacks.  This document formally updates RFC5905,
   recommending the use of transport-protocol ephemeral port
   randomization for those modes where use of the NTP well-known port is
   not required.

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