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Knowledge document #3603

FRITZ!Box reports "Network loop detected [...]"

The following messages are displayed in the event log of the FRITZ!Box:

  • "Error: Network loop detected, caused by [...] with IP address [...]"
  • "Fixed: Network loop caused by [...] with IP address [...]"

Cause

  • In the home network, devices are simultaneously connected with each other via several network connections (for example a wireless repeater that is connected to the FRITZ!Box via Wi-Fi and also network cable). Network loops can interfere with data transmissions and reduce the bandwidth in the home network due to the increased data traffic they cause.

1 Removing a network loop

To avoid problems in the home network, remove the network loop:

  1. Remove the additional network connection of the device that the FRITZ!Box names as the cause of the network loop. For example, remove the network cable from the device or disable the Wi-Fi network on the device. If the device is a Mesh Repeater, the message refers to incorrect configuration. In this case, reconfigure the Mesh Repeater:
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