101. Mikrotik Keep your Child Safe from Website Sex with DNS Redirection

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Script:

/ip firewall nat
add action=dst-nat chain=dstnat comment="Redirect DNS" dst-port=53 protocol=tcp to-addresses=199.85.127.30 to-ports=53

add action=dst-nat chain=dstnat comment="Redirect DNS" dst-port=53 protocol=udp to-addresses=199.85.127.30 to-ports=53

Note:
Norton DNS: 199.85.126.30
                       199.85.127.30
Ref: http://wiki.mikrotik.com/wiki/Force_users_to_use_specified_DNS_server