FRITZ!Box 5490 Service - Knowledge Base

FRITZ!Box 5490 Service

Fiber optic connection 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.

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 Changing the FRITZ!Box's power settings

Perform the following step if your Internet service provider guaranteed you a throughput of over 100 Mbit/s:

  1. Click "Home Network" in the FRITZ!Box user interface.
  2. Click "Home Network Overview" in the "Home Network" menu.
  3. Click on the "Network Settings" tab.
  4. Enable the option "Power Mode" for all of the LAN ports being used.
  5. Click "Apply" to save the settings.

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

Perform the following step if the 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.

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 standard 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. Check how many entries in the table start with 0.0.0.0.
  5. If there is more than one standard gateway (several entries begin with 0.0.0.0):

    Windows 10 / 8:

    1. Press the keyboard shortcut "Windows key" + "X" and select "Control Panel" from the context menu.
    2. Click "Network and Internet" in the "Control Panel" menu.
    3. Click "Network and Sharing Center" and then "Change adapter settings".
    4. Click on the arrow next to the "Change view" icon in the menu bar and select "Details".
    5. Right-click the LAN connection for a network adapter that is not connected to the FRITZ!Box. The name of the network adapters 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 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" icon in the menu bar and select "Details".
    6. Right-click the LAN connection for a network adapter that is not connected to the FRITZ!Box. The name of the network adapters 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.
  6. Repeat these steps for all LAN connections of network adapters that are not connected to the FRITZ!Box.

4 Disabling IPv6 support in macOS

When using DS-Lite ("Dual-Stack Lite") Internet connections, you may experience interruptions and delays when opening web pages on computers with macOS. You can solve this problem by disabling IPv6 support in macOS:

Note:With DS-Lite you can still use IPv4 applications with IPv6 Internet connections. When DS-Lite is active, the status "IPv4 over DS Lite" is displayed under "Connections" on the "Overview" page of the FRITZ!Box user interface.

5 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. Another cause could be technical difficulties your Internet service provider may be experiencing.