What should I do if I do not know the PPP authentication mode of the PPPoE server when the device functions as a PPPoE client

PPPoE authentication will fail if inconsistent PPP authentication modes are used on the PPPoE server and client. If you do not know the PPPoE authentication mode provided by the carrier, you are advised to configure both CHAP and PAP authentication modes on the device. The device will dynamically determine the authentication mode based on packets exchanged with the PPPoE server.

Run the ppp chap user username command in the dialer interface view to configure a user name for CHAP authentication.

Run the ppp chap password cipher password command in the dialer interface view to configure a password for CHAP authentication.

Run the ppp pap local-user username password cipher password command in the dialer interface view to configure a user name and a password for PAP authentication.

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