New answers tagged ethernet
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Ethernet implements a layer 1 / layer 2 protocol and can be used in full duplex mode.
You can send ANY DATA over the Ethernet connection. Most commonly TCP/IP is used and can be used to transfer data, but the protocol depends on your requirements and UDP is more suited to real time data.
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I am continually amazed by the things people put into /etc/network/interfaces.
It hasn't been used by Raspberry Pi OS for 7 years, and what you have would not have been correct even then!
Your /etc/network/interfaces will disable the default dhcpcd networking.
Either delete your changes or just delete /etc/network/interfaces (which by default does NOTHING).
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If you are running Arch Linux (which you should have disclosed in your question) you will have to set it up normally i.e. with a screen and keyboard.
Arch is an OS for expert users, comes with minimal code installed and CERTAINLY DOES NOT support the convenience functions Raspberry Pi OS includes. It is unlikely to have ssh active and depending on exactly ...
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The Ethernet will have a Link-local address (169.…)
You can ssh using a Link-local address on most Linux systems (although the range of other services may be limited).
You can also use ssh pi@raspberrypi.local to ssh.
This assumes you haven't changed the hostname from raspberrypi, AND
That you have enabled ssh on the Pi.
This can be done at initial imaging, ...
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