Picking a random source port is more or less standard behaviour of all OSses (Linux, Mac, OSX) so I'd be very surprised if that would lead to any issues (see e.g. here .) hummmm.... interesting. I have had completely ignored the Ephemeral port standardization... That is a point to consider. Perhaps...

Does anyone know if is there a ESP-IDF "tool" able to interact directly to the Ethernet TCP layer where I can set a default SOURCE PORT to the packages leaving ESP32? When "sniffing" the packets, I noticed that the source port changes dynamically when certain events happen (e.g. system reboots)... T...