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Manually adjusting the MTU size for DSL connections The FRITZ!Box does not offer the option to manually adjust the MTU size (Maximum Transmission Unit), i.e. to manually set the maximum size of user data that can be transmitted in a single data packet. Manually adjusting the MTU size is also not necessary because the FRITZ!Box supports MSS clamping (Maximum Segment Size) that automatically adjusts...

Setting up group switching for smart home devicesYou can combine several smart home devices into a group and then easily switch and control them together. Then you can switch a group of several smart plugs, for example FRITZ!DECT 200, automatically according to a schedule or depending on temperature. If necessary, you can also manually switch a group on and off for which a schedule is set up. In...

FRITZ!Box changes the Wi-Fi channel that was manually setAlthough a specific Wi-Fi channel was set in the user interface, the FRITZ!Box switches to a different channel by itself. The following message is displayed in the event log of the FRITZ!Box: "A very strong source of interference was detected on channel [...]; channel switched automatically." 1 Channel change due to strong interferenceThe...

Info LED flashes red or several LEDs flash continuouslyThe Info LED on the FRITZ!Box flashes red or several LEDs on the FRITZ!Box flash. ✔ Here's what to do.The Info LED on the FRITZ!Box flashes red or several LEDs on the FRITZ!Box flash continuously. The error occurred after updating FRITZ!OS manually or automatically. You may not be able to open the FRITZ!Box user interface any more and the...

Adjusting the MTU size in the FRITZ!Box The FRITZ!Box does not offer the option to manually adjust the MTU size (Maximum Transmission Unit), i.e. to manually set the maximum size of user data that can be transmitted in a single data packet. Manually adjusting the MTU size is also not necessary because the FRITZ!Box supports MSS clamping (Maximum Segment Size) that automatically adjusts the size of...

Configuring a firewall for FRITZ!VPNThe FRITZ!VPN software allows you to establish a secure VPN (Virtual Private Network) connection over the internet to your FRITZ!Box and access all of the devices and services in the home network of your FRITZ!Box. If the computer with FRITZ!VPN is protected by a firewall on the computer or an upstream router, you may have to open ports and enable IP protocols...

Configuring time synchronization (NTP) for FRITZ!Box and network devicesIn FRITZ!Box you can specify an NTP (Network Time Protocol) time server on the Internet with which the FRITZ!Box synchronizes its time. In addition, the FRITZ!Box itself provides a time server from which your computer and other devices in the home network can obtain the exact time.Requirements / Restrictions The FRITZ!Box...