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Configuring Network Manager for PPPoE connection

When I'm home, I use fiber-optic line with a dedicated old small router (YAMAHA RT107e) for access to the Internet.
But I recently became anxious about the router. If it fails, how can I survive until I get another one?

So, I tried to connect my Debian desktop PC to the fiber-optic line without the router.
The PC have to talk to the other side of the line with PPPoE but I did not know how.
In my PC, the Network Manager manages network configuration. So, I had to configure the Network Manager to utilize the pppoe like :


nmcli connection add ifname eth0 connection.type pppoe username USERNAME password PASSWORD

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