All routers have DHCP by default

hardware Activate DHCP server: This is how it works on the FritzBox and under Windows


The Dynamic Host Configuration Protocol, or DHCP for short, has been an integral part of routers and operating systems for many years. It makes the manual configuration of IP addresses in the network unnecessary: ​​A device with an Internet connection automatically assigns IP addresses to all connected systems. By default, the protocol should be active on the FritzBox, but many older admins still tend to assign fixed IP addresses, which is superfluous in most cases: Especially those who use many WLAN devices should therefore use their DHCP server Set FritzBox to avoid problems.

Activate the FritzBox DHCP server

To activate the FritzBox's DHCP server (or to deactivate it if you want fixed IP addresses), only a few steps are necessary:

Fixed IP despite DHCP

Unfortunately, there is a problem with DHCP: the DHCP server simply assigns IP addresses to devices in the network as it has grown to do. Conversely, this means that a device that was available yesterday under a certain IP in the network may no longer be found at this point tomorrow. This can be a nuisance in more complex networks. But don't worry: you can also use DHCP to assign fixed IP addresses to certain devices.

Set up Windows PC for DHCP

Windows PCs should usually be set up to receive addresses via DHCP. However, some Windows 10 devices are adjusted or otherwise incorrectly set up. If your PC does not connect to the WLAN or Ethernet after activating the DHCP server, you must activate the DHCP function here later:

DHCP should usually be active at the factory

If you have other devices in the network - Linux computers such as the Raspberry Pi, Macs, smartphones, tablets, printers and so on - you normally do not have to take any additional steps: All these devices are set up for DHCP at the factory, which is why the connection is usually should work even after the switch. If this is not the case, you should set the WLAN and Ethernet connections to "Automatic" in order to overwrite any existing fixed IP addresses and to activate the DHCP function. If a device connects to the WLAN after the DHCP changeover, but still outputs an error message, DHCP does not appear to be active here: In this case, you have to activate the automatic acquisition of the IP address. This is easily possible on all systems in the network settings or the settings for the respective connection.