[New-wg-docs] I-D Action: draft-ietf-ntp-port-randomization-00.txt

internet-drafts@ietf.org Fri, 01 November 2019 15:58 UTC

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Subject: [New-wg-docs] I-D Action: draft-ietf-ntp-port-randomization-00.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-00.txt
	Pages           : 10
	Date            : 2019-10-22

   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 service/well-known port as the local
   port number.  However, in the case of NTP modes where the use of a
   service/well-known port is not required, employing such well-known/
   service port unnecessarily increases the ability of attackers to
   perform blind/off-path attacks.  This document formally updates
   RFC5905, recommending the use of port randomization for those modes
   where use of the NTP service port is not required.

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