setup PPPoE (Point-to-Point Protocol over Ethernet) connection directly to linux pc

get the device interface first

nmcli device status

Look for your Ethernet interface (e.g., `enp3s0`, `eth0`, etc.)
if its eth0 it will be like this
ifname eth0 con-name

nmcli connection add type pppoe ifname <interface_name> con-name "your_connection_name" pppoe.username isp_given_username pppoe.password isp_given_password autoconnect yes

Verify connection

nmcli connection show

to restart NetworkManager

sudo systemctl restart NetworkManager

Basic connection management

# Connect manually
nmcli connection up "your_connection_name"

# Disconnect
nmcli connection down "your_connection_name"