NAT devices not translating privileged ports

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I believe all devices will translate a privileged ports, but it won't translate to the same number on the other side. It will translate to an unprivileged port. Is it what you meant or really there are some devices that will not translate at all a privileged port?

What are you trying to achieve?

Jean

-----Original Message-----
From: NANOG <nanog-bounces+jean=ddostest.me at nanog.org> On Behalf Of Fernando Gont
Sent: June 4, 2021 3:00 AM
To: nanog at nanog.org
Subject: NAT devices not translating privileged ports

Folks,

While discussing port randomization (in the context of https://www.ietf.org/archive/id/draft-ietf-ntp-port-randomization-06.txt
), it has been raised to us that some NAT devices do not translate the source port if the source port is a privileged port (<1024).

Any clues/examples of this type of NATs?

Thanks!

Regards,
--
Fernando Gont
Director of Information Security
EdgeUno, Inc.
PGP Fingerprint: DFBD 63E3 B248 AE79 C598 AF23 EBAE DA03 0644 1531

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