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owl [soylentnews.org] writes:

UDP is a transport-level protocol for sending messages through an IP network.

It sits at level 4 in the OSI model:

7 Application
6 Presentation
5 Session
4 Transport
3 Network
2 Data link
1 Physical

Like many of you, I've got hardware on my desk that's sending UDP packets, and the time has come to take a closer look at them.

Most "low-level" networking tutorials will bottom out somewhere at "use tcpdump to see raw packets". We'll be starting a bit lower in the stack; specifically, here:

[Picture of Probes soldered to a circuit board]

This is a high-speed active differential probe soldered to an Oxide Computer Company rack switch. We're going all the way down to the metal.

Original Submission