RUT900 Use LAN port as WAN

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Introduction[edit | edit source]

The information in this page is updated in accordance with the RUT9XX_R_00.06.05.3 firmware version.
This article provides a guide on how to configure the LAN ports as WAN. It can be usefull as wired ISP redundant connection or even to change the port for physical damage or a custom mounting.

Configuration overview and prerequisites[edit | edit source]

Before we begin, let's overview the configuration that we are attempting to achieve and the prerequisites that make it possible. Prerequisites:

  • One RUTxxx series router (excluding RUT850).
  • At least two wired Internet connections.
  • An end device for test the configuration.

Configuration scheme: Networking rut900 configuration examples lan port as wan scheme v1.png

WebUI Router configuration[edit | edit source]

Connect to the router’s WebUI navigate to Network -> VLAN -> LAN Network and create a new interface by entering name and clicking Add New.
Networking rutxxx configuration examples use lan as wan 1 v3.png
After you clicked Add New new configuration window will pop-up, there you leave as default and press Save. Networking rutxxx configuration examples use lan as wan 2 v1.png
After saving settings, you will be redirected back to Network -> VLAN -> VLAN Networks, now you need to open VLAN Network tab in the same window and you will need to:

  • Select VLAN mode: Port based
  • Current LAN interface:
    - Enable wireless access
    - Select your current LAN interface.
    - Turn off LAN port 3 (which will be used as WAN port)
    - Press Save.
  • Note: Make sure that you are not connected to that LAN port which you going to disable.
  • New LAN_WAN interface:
    - Click Add and a new row will appear.
    - Turn off LAN ports 1-2 and leave only LAN port 3 on.
    - Select your newly created interface in the LAN section and click Save.

Networking rutxxx configuration examples use lan as wan 3 v1.png

CLI/SSH Router configuration[edit | edit source]

For the next part you will be configuring router via SSH. For this you need to use the command line interface (CLI) or a SSH software if you’re using Windows or iOS. In this example software putty will be used. Open putty enter routers LAN IP address and press Open.

Networking rutxxx configuration examples use lan as wan 8 v1.png

After clicking Open you will need to enter router credentials.

  • Login as: root
  • Password: routers admin password (by default admin01)
  • Networking rutxxx configuration examples use lan as wan 9 v1.png

    Now when you are connected you will need to make changes to network settings, this will be achieved via SSH command: vi, which allows you to edit settings in the router. Enter following command in SSH:

  • vi /etc/config/network press latter i to be able to edit.
  • Using DHCP[edit | edit source]


    Using the arrow keys on your keyboard, navigate and find config interface 'lan_wan' erase the current configuration and write these options:

  • option proto 'dhcp'
  • option ifname 'eth0.1'
  • option backup '1'
  • option metric '10'
  • Networking rutxxx configuration examples use lan as wan 4 v1.png

    Using Static IP[edit | edit source]


    Using arrows navigate and find config interface 'lan_wan' leave the current configuration and add these four options:

  • option gateway '192.168.10.1'
  • option dns '8.8.8.8'
  • option backup '1'
  • option metric '10'
  • Networking rutxxx configuration examples use lan as wan 5 v1.png
    After that you will need to go out of the vi.

  • Press ESC, write :wq and press Enter Restart the network service on the router, for this use command:
  • /etc/init.d/network restart

  • After restart is completed go back to routers WebUI and navigate to Network -> Firewall -> General Settings. Scroll down, in Zone Forwarding find source zone lan_wan and change “Default forwarding action” from reject to accept and also check Masquerading and save settings.
    Networking rutxxx configuration examples use lan as wan 6 v1.png

    Testing the configuration[edit | edit source]

    If you did the steps in the right way, your end device should have internet connection according the scheme.
    Go to Network --> WAN and check if the new LAN_WAN is enable and if it has an assigned IP.

  • Set up your WAN as a main connection
  • Set up your configured LAN port as WAN failover backup.
  • Networking rutxxx configuration examples use lan as wan 7 v1.png

  • Go to www.whatsmyip.com and check your public IP.
  • 0011.png

  • After that, unplug the WAN cable and check again your Public IP. Your end device should have internet connection and a differt public IP
  • 0012.png

  • So, plug again the WAN internet connection and wait a few seconds. The public IP should change again to the first IP shown.