FRITZ!Box 3490 Service - Knowledge Base

FRITZ!Box 3490 Service

Internet access over the FRITZ!Box is slow

The Internet connection on computers, smartphones, and other devices connected to the FRITZ!Box is very slow. As a result, web pages load slowly, it takes a long time to download files, and video streams are either not displayed correctly or stop playing, for example.

Important:If you are using your FRITZ!Box with an additional modem or router (for example a cable modem) proceed as described in this guide.

Note:The configuration procedure and notes on functions given in this guide refer to the latest FRITZ!OS for your FRITZ!Box.

Simply proceed as described below. After each measure, check whether the issue persists.

1 Checking the DSL line

Checking the throughput of the DSL connection

Check whether the FRITZ!Box displays the DSL throughput (speed) guaranteed by your DSL provider:

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "DSL Information" in the "Internet" menu.
  3. Click on the "DSL" tab.
  4. Check which throughput is displayed in the "Current throughput" line.
  5. If the current throughput is almost as high as the speed guaranteed by your DSL provider, then there is no problem.

    Note:With many DSL lines, you will not be able to fully achieve the guaranteed throughput. Therefore, DSL providers say that they offer DSL speeds of "up to" a certain value.

Checking the DSL connection for errors

Problems with the DSL line may slow down the Internet connection. Therefore, check whether numerous errors occur on your DSL line:

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "DSL Information" in the "Internet" menu.
  3. Click on the "DSL" tab.
  4. Check in the "Error Counter" section whether "Not Remediable Errors" (CRC) occur in the FRITZ!Box or the DSL exchange when you use the Internet.
  5. If more than 500 errors occur within 15 minutes, follow the instructions given in our guide FRITZ!Box indicates numerous DSL connection errors.

2 Checking the throughput between the wireless device and the FRITZ!Box

Perform the following step if the respective device is connected to the FRITZ!Box over wireless LAN, but it also is equipped with a network port:

  1. Clear the wireless connection between the device and the FRITZ!Box.
  2. Use a network cable (for example the yellow cable included with delivery) to connect the device to the FRITZ!Box.
  3. Check whether you notice any difference in speed when you connect to the Internet over LAN instead of over wireless LAN.
  4. If Internet access via LAN is significantly faster, follow the instructions given in our guide Slow wireless connections (low throughput).

3 Correcting the Windows network settings

In order for a computer to access the Internet, all Internet requests from the computer must be forwarded to the FRITZ!Box. If the computer automatically obtains its IP settings from the FRITZ!Box via DHCP, then it also automatically obtains a default gateway (IP address of the FRITZ!Box).

Multiple default gateways are not allowed and cause errors. Therefore, make sure that only one single default gateway is configured:

Note:Note for network experts: Default gateways required to route to another IP network can be replaced with a static route. Refer to the Windows help for information on how to set up static routes.

  1. Press the keyboard shortcut Windows key + R.
  2. Enter cmd in the "Open" field and click "OK".
  3. Enter route print in the command prompt window and press Enter.
  4. If you see several entries in the table with 0.0.0.0, then there is more than one default gateway:

    Windows 10

    1. Click "Start" and then "Settings" in the Windows task bar.
    2. Click "Network & Internet" in the "Settings" menu.
    3. Click "Change adapter options" in the "Change your networking settings" section.
    4. Click on the arrow next to the button (Change view) in the menu bar and select "Details".
    5. Right-click the connection for a network adapter that is not connected to the FRITZ!Box. The name of the adapter is listed under "Device Name".
    6. Click "Properties".
    7. Select "Internet Protocol Version 4 (TCP/IPv4)".
    8. Click "Properties".
    9. If there is a default gateway entry, remove it.
    10. Click "OK" to save the settings.

    Windows 8

    1. Press the keyboard shortcut Windows key + X and select "Control Panel" from the context menu.
    2. Select "Category" from the drop-down list "View by:" on the top right ().
    3. Click "Network and Internet" and then "Network and Sharing Center".
    4. Click "Change adapter settings".
    5. Click on the arrow next to the button (Change view) in the menu bar and select "Details".
    6. Right-click the connection for a network adapter that is not connected to the FRITZ!Box. The name of the adapter is listed under "Device Name".
    7. Click "Properties".
    8. Select "Internet Protocol Version 4 (TCP/IPv4)".
    9. Click "Properties".
    10. If there is a default gateway entry, remove it.
    11. Click "OK" to save the settings.

    Windows 7

    1. In Windows, click "Start" and then "Control Panel".
    2. Select "Category" from the drop-down list "View by:" on the top right ().
    3. Click "Network and Internet" and then "Network and Sharing Center".
    4. Click "Change adapter settings".
    5. Click on the arrow next to the "Change view" button in the menu bar and select "Details".
    6. Right-click the connection for a network adapter that is not connected to the FRITZ!Box. The name of the adapter is listed under "Device Name".
    7. Click "Properties".
    8. Select "Internet Protocol Version 4 (TCP/IPv4)".
    9. Click "Properties".
    10. If there is a default gateway entry, remove it.
    11. Click "OK" to save the settings.
  5. Repeat these steps for all network adapters that are not connected to the FRITZ!Box.

4 Configuring security software

Using security software such as firewalls, antivirus software or web filters to monitor Internet access can reduce the Internet speed on your computer:

  • Configure all security software installed so that it does not limit the speed of your Internet connection.

Now the FRITZ!Box and the devices connected to it establish the fastest Internet connection possible. If Internet access continues to be slow, your Internet service provider may be experiencing technical difficulties.