Technical Tip: Configuring a FortiGate with an Inbuilt DSL Modem for German Telekom DSL Connection

[LennartElbers]

Description	This article describes how to configure a FortiGate or FortiWiFi device with an inbuilt DSL modem to connect to Deutsche Telekom via DSL. The configuration involves setting up the DSL interface and PPPoE authentication using the credentials provided by Telekom.
Scope	FortiGate or FortiWiFi with an inbuilt DSL modem.
Solution	Prerequisites: Before proceeding with the configuration, ensure the following conditions are met: Deutsche Telekom provides a modem configured in bridge mode. A PPPoE username and password are provided by Deutsche Telekom. The Deutsche Telekom modem is connected to the FortiGate DSL port. Configuration Steps: Access the FortiGate CLI. Configure the DSL interface by entering the following commands: config system interface     edit "dsl"         set vlanforward enable         set phy-mode vdsl2         set tc-mode ptm         set profiles 17a 35b     <---- Optional (commonly used by Deutsche Telekom, may not apply).         set annex b     next     edit "TELEKOM_DSL"         set mode pppoe         set username [USERNAME]         set password [PASSWORD]         set interface "dsl"         set vlanid 7     next end With this configuration, the FortiGate should establish a DSL connection with Deutsche Telekom. Related articles: Troubleshooting Tip: VDSL issues on FortiGate 80F-DSL  Technical Tip: How to configure PPPoE connection with VLAN tag