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On a connected device, open a browser.
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Visit one of the following (depending on your router setup, you can find relevant address on the back of your router):
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Log in using your router username/password.
(Default is usually admin / admin, unless changed.)
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On the top right, select Advanced.

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Go to Network → DHCP Server.
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Toggle DHCP Server Enable checkmark.
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Enter Primary DNS: 146.59.198.179

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Click Save.