@misc{rfc9109,
    series =    {Request for Comments},
    number =    9109,
    howpublished =  {RFC 9109},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC9109},
    url =       {https://www.rfc-editor.org/info/rfc9109},
    author =    {Fernando Gont and Guillermo Gont and Miroslav Lichvar},
    title =     {{Network Time Protocol Version 4: Port Randomization}},
    pagetotal = 9,
    year =      2021,
    month =     aug,
    abstract =  {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.},
}