This Configuration Guide shows how to commission a DSL router with icom OS for operation on a DSL line of the provider Deutschen Telekom.

The description in this Configuration Guide follows a configuration in the new user interface (web interface) available from icom OS 5.5. Update your router to the latest version of icom OS for the required functionality of the new user interface.


You have a DSL router with icom OS and want to commission it on a Telekom DSL line, i.e. connect it to the Internet.


We will use the Startup Wizard to configure the router for a DSL connection. The Startup Wizard will configure the router for basic operation and Internet (WAN) connectivity in just a few steps.

The following is prerequisite:

  • The device is in factory settings

  • A DSL modem is installed in slot 2

  • The DSL port of the router is connected to your DSL line or the output of your DSL splitter

Note The device can only be accessed via the first Ethernet socket in default settings. This avoids to bridge several networks accidentally on an already configured router when resetting to default settings.

Commissioning using the Startup Wizard

  1. Open the user interface of the router in a browser: insys.icom [1]

  2. Click To Startup Wizard on the startup screen under auto fix *Startup Wizard_. [2].

  3. Click in the Startup wizard on   START  auto fix white  .
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  4. If necessary, change the time and synchronisation settings and click on   NEXT  menu right white  .
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  5. Enter the credentials required for authentication (or configure an Authentication through certificates) and click on   NEXT  menu right white  .
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  6. Configure the DSL connection:

    • Type of Internet connection: DSL

    • MTU: 1492

    • ISP user name: see Composition of the user name

    • ISP password: Pers√∂nliches Kennwort (personal password in the welcome letter containing the credentials

    • VLAN tag: 7

    • VPI: 1

    • VCI: 32

    • Multiplex: LLC cg en m3 dsl via telekom 04

  7. Click on   NEXT  icon: menu-right_white]  .

  8. Optional: configure a VPN connection and click on   NEXT  menu right white  .
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  9. Optional: change the LAN connection settings and click   NEXT  menu right white  .
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  10. Optional: upload a configuration for the icom Router Management to the router.
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  11. Click on   RUN WIZARD  .

  12. Click on   EXIT WIZARD  cog white   after the configuration has been made by the startup wizard.

The startup wizard configures the router for the DSL connection. The establishment of the DSL connection can be observed in the view dashboard outline StatusDashboard menu in the DSL2 section. The Showtime status indicates that the DSL connection is established.
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Composition of the user name

You will get the credentials from your provider.

In the letter from Deutsche Telekom containing the credentials, you will find a Zugangsnummer (access number), a Persönliches Kennwort (personal password), a Anschlusskennung (connection ID) and a Mitbenutzernummer (co-user number).

The ISP user name is composed of Anschlusskennung, Zugangsnummer and Mitbenutzernummer as follows. Depending on the length of the Zugangsnummer, the composition differs:

  • Example for a 12-digit Zugangsnummer:

    • Anschlusskennung: 002123456789

    • Zugangsnummer: 551112345678

    • Mitbenutzernummer: 0001

The ISP user name to be configured in the router is composed as follows: =

  • Example for a <12-digit Zugangsnummer:

    • Anschlusskennung: 002123456789

    • Zugangsnummer: 0228181818

    • Mitbenutzernummer: 0001

The ISP user name to be configured in the router is composed as follows: =

Also be aware of a possibly required VLAN tag; this is often not documented in the credentials; for the provider Deutsche Telekom, for example, it is 7.


  • The status of the DSL connection as well as the WAN chain and their interfaces is displayed on the view dashboard outline StatusDashboard page. If an interface does not achieve the online condition, its condition can also be examined on this page.

  • If no network traffic is achieved, the tools integrated in the router can be used for debugging.

  • The required setting for the VLAN tag (often also referred to as VLAN ID) is often not provided with the credentials by many providers. Telekom and various other providers use 7. If in doubt, ask your provider for the necessary setting.

  • The MTU (Maximum Transmission Unit) value proposed by Telekom is 1492. The router is configured to an MTU of 1452 in factory settings. If this value causes connection problems, you can adjust the MTU in the lan NetworkInterfaces menu. To do this, click on pencil in the DSL interface line in the DSL section and then click on menu right to extended view.

Back to the Configuration Guides for icom OS router

Back to overview

1. Standard IP address:; authentication depending on configuration; default for past firmware versions: User name: insys, Password: icom
2. If the router is not in factory settings, the startup screen is not displayed; the Startup Wizard can then be started in the handshake outline WizardsStartup Wizard menu