Block remote DNS requests from WAN

RouterOS Beginner Basics
1

Hi,

I want to allow DNS remote requests from LAN and block them from the WAN interface for example a PPPoE interface.
How do I have to configure the firewall?

2

assuming ether1 to be your wan port
/ip firewall filter
add action=drop chain=input dst-port=53 in-interface=ether1 protocol=udp

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3

If you want to configure RouterOS as a firewall then you should generally be dropping all input/forward chain traffic that you haven’t explicitly allowed.