# Protect Open Recursive DNS - Mikrotik Script RouterOS

    Have you ever felt that internet access suddenly feels slow? it could be that someone is naughty who uses our public router IP as a DNS server,
    usually this is indicated by the high upload speed to the internet, to avoid this we simply use the script below.

    /ip firewall filter
    add chain=input dst-port=53 in-interface=WAN protocol=tcp action=drop
    add chain=input dst-port=53 in-interface=WAN protocol=udp action=drop
    Credit: www.o-om.com