this post was submitted on 11 Dec 2023
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You forgot to mention that you might get it twice, or thrice, or more, and in different versions.
(novice) Why would you get UDP packets multiple times? UDP doesn't check for acceptance I thought.
From StackOverflow:
https://stackoverflow.com/questions/9196791/duplicate-udp-packets-how-often-it-happens#9220574
That is extraordinarily rare and I'm not even sure if it's possible anymore. That was potential attack vector in the 90's where you have a port on network switch, and then you flood the cam table with thousands of bogus mac addresses until you fill it up, then the switch turns into a hub, and you can now sniff all traffic traversing the switch. These days I'm not sure what will happen if you do successfully fill up a switches cam table. Also cam table sizes are are much much larger now. ~128k entry's vs maybe 1000 back in the day.
You can bring a surprisingly large number of network segments down just by plugging both ends of the same cable into a dumb switch. It probably won't happen immediately, but eventually you will get a broadcast storm which will propagate until it hits an element smart enough to snuff it out.