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Knowledge document #3529

FRITZ!Box reports "The IP address is not located in a permissible FRITZ!Box network"

You cannot configure port sharing in the FRITZ!Box. Although the IP address you want to configure port sharing for is in the FRITZ!Box home network, one of the following error messages is displayed when you try to configure port sharing:

  • "An error occurred. Error description: The IP address is not located in a permissible FRITZ!Box network"
  • "The port sharing cannot be created or enabled because the destination is not located in the home network."

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

1 The IP address is used by the FRITZ!Box

If the FRITZ!Box is used on an internet connection with multiple fixed public IPv4 addresses (public IPv4 subnet), the FRITZ!Box uses the first IPv4 address of the public IPv4 subnet for itself.

This IPv4 address can therefore not be used by devices in the home network or by port sharing.

2 IP address is located in the guest network

Port sharing cannot be configured in the FRITZ!Box for devices that are connected to the FRITZ!Box via the LAN or Wi-Fi guest network. The FRITZ!Box does not support access to devices in the guest network (factory setting: IP network 192.168.189.0, subnet mask 255.255.255.0) from the internet.

3 Adjusting the FRITZ!Box's IP network

The FRITZ!Box prevents you from configuring port sharing for IP addresses in the IP network 192.168.100.0 that is reserved for the cable provider and, when used as a cascaded router, you also cannot configure port sharing for IP addresses from the IP network of the upstream router because such port sharings could not be used.

Therefore, make sure that the FRITZ!Box does not use the IP network 192.168.100.0 or the IP network of an upstream router:

Changing the FRITZ!Box's IP network
  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. Click "Additional Settings" in the section "LAN Settings" to display all of the settings.
  5. Click the "IPv4 Settings" button.
  6. Enter the desired IP address and subnet mask.

    Important:Do not enter an IP address from the network 192.168.100.x. In compliance with DOCSIS, this network is reserved for the cable provider and may not be used in the FRITZ!Box.

  7. Click "Apply" to save the settings and on the FRITZ!Box, confirm that the procedure may be executed, if you are asked to do so.
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