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i set up a static ip address on my pi 3 but after that the internet is not working. how can I change it to dynamic? or what should I do?

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Set a 'reserved' ip address in your DHCP (router) server: It will always assign the same IP address to your Pi. It will act the same as a static address. No configuration in the Pi.

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You must change the configuration file /etc/networl/interfaces.

for eth0 you must have a row like this one

iface eth0 inet dhcp

change the file, saveit and restart network service:

systemctl daemon-reload

you can renew your ip address with dhclient

Of course you must have root privileges. Use su - root or sudo

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