Re: NAT devices not translating privileged ports

[Bjørn Mork <bjorn () mork no>]

Fernando Gont via NANOG <nanog () nanog org> writes:

> What has been reported to us is that some boxes do not translate the
> src port if it's a privileged port.
>
> IN such scenarios, NTP implementations that always use src port=123,
> dst port=123 might be in trouble if there are multiple NTP clients
> behind the same NAT device....

This problem used to be very common for 500/udp.  Ref
https://datatracker.ietf.org/doc/html/rfc3715#section-2.3


Bjørn