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Internet access over a different modem / router 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 not played correctly or are interrupted, for example.

In this case, the FRITZ!Box connects to the internet over an additional DSL or cable modem or uses an existing internet connection in the network.

Simply proceed as described below. After each measure, check whether the problem is solved.

Note:All instructions on configuration and settings given in this guide refer to the latest FRITZ!OS for the FRITZ!Box.

1 Restarting the modem / router

The modem or upstream router may be malfunctioning, for example due to an error that occurs occasionally:

  1. Restart the modem or router by unplugging it briefly.

    Note:It may take several minutes for the modem or router to restart. You cannot access the internet while it is restarting.

2 Setting up "LAN 1" port for gigabit LAN

The following step is only necessary if your internet service provider guaranteed you speeds of over 100 Mbit/s:

  1. Click "Home Network" in the FRITZ!Box user interface.
  2. Click "Network" in the "Home Network" menu.
  3. Click on the "Network Settings" tab.
  4. Enable "Power Mode" (1 Gbit/s) for the "LAN 1" port.
  5. Click "Apply" to save the settings.

3 Setting the speed of your internet connection in the FRITZ!Box

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "Account Information" in the "Internet" menu.
  3. If there are no fields for entering "Downstream" and "Upstream" in the section "Connection Settings", continue with the next section.
    • If fields for entering "Downstream" and "Upstream" are present:
      1. In the "Downstream" field, enter the speed for receiving files (download) supported by your internet connection in kbit/s (for example 25000 for 25 Mbit/s).
      2. In the "Upstream" field, enter the speed for sending data (upload) supported by your internet connection in kbit/s (for example 5000 for 5 Mbit/s).
      3. Click "Apply" to save the settings.
      4. Test whether the internet connection is fast enough now.
      5. If internet access is still much too slow:
        1. Slightly reduce the upstream value, for example by 1000 kbit/s.
        2. Test whether the internet connection is fast enough now.
        3. Repeat these steps several times and use the setting that gives you the best speed.

4 Optimizing Wi-Fi connections

The following step is only necessary if Wi-Fi connections to the FRITZ!Box are affected:

  1. Follow the steps in our guide Slow Wi-Fi connections (low throughput).

5 Correcting the Windows network settings

In order for a computer to access the internet, all web 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, it also automatically receives a default gateway (IP address of the FRITZ!Box).

Configuring multiple default gateways is not allowed and causes errors. Therefore, make sure that only one single default gateway is configured on the computer:

Note:Note for network experts: Default gateways required for routing to another IP network can be replaced by a static route. Refer to the Windows help for information on setting 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 section "Advanced network settings".
    4. Click the arrow next to the (Change view) button 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 a default gateway was entered, 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 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 a default gateway was entered, 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 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 a default gateway was entered, 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.

6 Configuring security software

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

  1. Configure all security software 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 possible internet connection. If internet access continues to be slow, your internet service provider may be throttling the speed, experiencing technical difficulties, or there may be an error with the upstream modem or router.