FritzBox lists two IP addresses as NSLookup does

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Problem :

My network has a Fritzbox 7390, a raspi connected with it over LAN and my laptop connected over wifi.
My raspi is configured to have the static IP address 192.168.178.44, for quite a long time, this was working quite good. Since a recent power failure, the router is listing the raspi with two IP addresses 192.168.178.44 and 192.168.178.77.
The problem is, that I can’t reach the raspi by its network name anymore.
NSLOOKUP gives me both addresses and resolving the raspi’s network name gives the wrong IP to me (the 192.168.178.77 one).
However, I’ve never used a device with a 77 IP so far in my network.

I tried already flushing the raspi’s lease, rebooting the router with no effect so far.

How can I get rid of the 192.168.178.77 entry ?

Solution :

Export Fritzbox configuration (System/Sicherung/Sichern), open in editor, find section with IP assignments, edit, restore configuration.

And I hope by “RaspPi has static address” you mean you’ve configured the Fritzbox to give it always the same IP address, and you run a dhcp client on the RaspPi.

If the address is locally statically configured on the RaspPi, use an address outside of the range the Fritzbox will use in DHCP (that range is also somewhere in the configuration).

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