Configuring PPPoE

Last Updated : Mar 26, 2020 |

Procedure

  1. Enter the FastEthernet interface context with the interface fastethernet 10/2 command.
  2. Enter encapsulation pppoe to change the encapsulation to PPPoE.

    You must change the encapsulation to PPPoE before configuring an IP address on the interface.

    Note:

    You cannot use PPPoE if:

    • An IP address must not be configured on the interface

    • Dynamic CAC is not enabled on the interface.

    • The interface is not part of a primary-backup interface pair.

  3. Use the ip address command to configure an IP address and subnet mask for the interface.

    In most cases, PPPoE tunnels require a 32-bit subnet mask.

    Alternatively, you can enter ip address negotiated to obtain an IP address via PPP/IPCP negotiation.

    Note:

    You cannot configure PPP/IPCP address negotiation if DHCP address negotiation is already configured on the interface.

  4. Configure an authentication method and parameters:

    • For PAP authenticating, enter ppp pap-sent username followed by a user name and password. For example:

      Gxxx-001(super-if:FastEthernet 10/2)# ppp pap-sent username avaya32 password ******
Done!

    • For CHAP authentication, enter ppp chap hostname followed by a hostname, and ppp chap password followed by a password. For example:

      Gxxx-001(super-if:FastEthernet 10/2)# ppp chap hostname avaya32
Done!
Gxxx-001(super-if:FastEthernet 10/2)# ppp chap password ******
Done!
  5. If the Branch Gateway is connected to the Internet via the FastEthernet interface configured for PPPoE, and you define a VPN tunnel which specifies remote hosts by name, it is recommended to use the ppp ipcp dns request command.

    The command requests the list of available DNS servers from the remote peer during the PPP/IPCP session. The DNS servers are used by the DNS resolver to resolve hostnames to IP addresses.

  6. Enter exit to return to general context.

    The prompt returns to:

    Gxxx-001(super)#
  7. Test the configuration.

    See WAN configuration and testing connectivity.

  8. Enter copy running-config startup-config to save the configuration.
  9. Optionally, shut down the port and the PPPoE client, if configured, with the shutdown command in the interface context.
Related information
Dynamic CAC
Backup interfaces
DHCP client configuration