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SEI DSL Technical Support

  Comtrend AR-5381U ADSL Router Topics

  • How to configure the Comtrend AR-5381U ADSL Router
  • Configuring Bridge Mode
  • Configuring Pinholes/Port Forwarding
  • Enabling WIFI (wireless)


  • Configuring the Comtrend AR-5381U ADSL Router
    1) From a web browser, go to "http://192.168.1.1". Login with the username "admin" and the password "admin".
    2) Click the "Advanced Setup" link on the left.


    3) Click on the "WAN Service" link on the left.


    4) Click on the "Edit" button on the row beginning with "ppp1".


    5) Now just change the "PPP Username" field to your SEI Data provided username, change the "PPP Password" to the username's corresponding password, then click "Next".


    6) Click "Apply/Save".


    Modem is now configured for SEI Internet service.

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    Configuring for Bridge Mode
    Before proceeding, be aware of the following:
  • By placing your DSL router in bridge mode, you are foregoing the basic firewall protection that the Comtrend router provides while in router mode.
  • By placing your DSL router in bridge mode, you will be required to configure PPPoE (PPP over Ethernet) on the device you are directly connecting to the DSL modem. For instance if you are using a wireless router, you will need to configure it's WAN port to authenticate via PPPoE. If you are connecting a PC directly to the DSL modem, you will need to use PPPoE software on your PC to authenticate.
  • By placing your DSL router in bridge mode, only 1 device may be directly attached to the DSL modem. In order to use more than 1 computer through the modem a additional router will be required which will be the 1 device plugged directly into the modem.

  • Before you start, make sure of the following:
  • Unplug the phone line from the modem while doing this and plug it back in once your modem is in bridge mode.
  • Reset the modem back to factory defaults by holding the small button on the back of the modem for about 10 seconds while the modem is powered up.
  • You are successfully able to log into the modem.

  • 1) From a web browser, go to "http://192.168.1.1". Login with the username "admin" and the password "admin".
    2) Click the "Advanced Setup" link on the left.


    3) Click on the "WAN Service" link on the left.


    4) Checkmark both check boxes under the "Remove" column, then click the "Remove" button.


    5) Click on the "Add" button.


    6) Ensure the the interface listed in the drop down filed is set to "atm0/0_0_35", then click the "Next" button.


    7) Change the radio button to "Bridging", then click the "Next" button.


    8) Click the "Apply/Save" button.


    9) Click on the "Reboot" button.


    10) You are done. The modem is now in bridge mode and will no longer provide you an IP. You will now need to use an external router capable of PPPoE or a PPPoE dialer on your PC. If you need to re-access the modem, you will need to manually assign the IP 192.168.1.10 to your PC with a subnet mask of 255.255.255.0, then you can access http://192.168.1.1. If you need to return your modem back to router mode, press the reset button until the lights flash red on the modem, then release.

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    Configuring Pinholes/Port Forwarding
    1) From a web browser, go to "http://192.168.1.1". Login with the username "admin" and the password "admin".
    2) Click the "Advanced Setup" link on the left.


    3) Click on the "NAT" link on the left.


    4) Click on the "Add" button.


    5) Check if the setup you need is in the pre-configured list under "Select a Service".


    6) If not, create your own. As an example, here we are adding ports needed for Xbox LIVE (per http://support.xbox.com/en-US/xbox-live/connecting/network-ports-used-xbox-live). Once you have added your desired port forwards, click "Apply/Save" at the bottom of the page.


    7) If you specify a port that the router uses for the management of the router, you will see this.


    8) You are now done.


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    Configuring WIFI/Wireless
    You have your choice of one of two ways to enable the wireless access point in your SEI provided Comtrend AR-5381u:
      A) Easy way by pressing a button and using preset defaults.
      B) Personalized approach (you can set your own SSID & security).


    Easy setup:
    1) On the front of your modem, there are 2 physical buttons. Press and hold the one labeled "WiFi On/Off" for approximately 5 seconds until the "WLAN" LED turns on.

    2) On your WIFI capable devices, you will then connect to the SSID "ComtrendXXXX" where XXXX are the last 4 characters (in capitol letters) of your modems MAC address. There is a sticker on the bottom of your modem with this MAC address.

    3) Security is enabled by default using WPA2. The WPA2 encryption key/passphrase is the last 10 digits of your modems MAC address also all in capitol letters. (The last 10 would be all but the first 2 characters of the MAC address).

    * For example, if your MAC address is "3872C0A1B2C3", then your SSID would be "ComtrendB2C3" and your WPA2 encryption key/passphrase would be "72C0A1B2C3". Also note, there are no letter o's in the MAC address, they are zero's.



    Personalized setup:

    1) From a web browser, go to "http://192.168.1.1". Login with the username "admin" and the password "admin".
    2) Click the "Wireless" link on the left.


    3) Checkmark "Enable Wireless", and change the "SSID" if you wish, then click "Apply/Save". (By default, wireless is disabled but the SSID is ComtrendXXXX, where XXXX are replaced with the last 4 characters of your routers MAC address).


    4) Click the "Security" link on the left. You can change your encryption passphrase/key here, or you can view the current one as well. If you change it, be sure to click the "Apply/Save" button. (By default the passphrase/key is the last 10 characters of your routers MAC address which can also be see on the bottom of the router).


    5) Click on the "Apply/Save" button. Wireless access is now enabled.

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