I have search after firewall rules to protect the router and the users.
I found this on a topic here on the forum.
/ip firewall filter
add action=accept chain=input comment="Accept established connections" connection-state=established disabled=no
add action=accept chain=input comment="Accept related connections" connection-state=related disabled=no
add action=drop chain=input comment="Drop invalid connections" connection-state=invalid disabled=no
add action=accept chain=input comment="Accept everything from known IP Addresses" disabled=no src-address-list=known
add action=accept chain=input comment="Accept everything from LAN" disabled=no in-interface=LAN
add action=drop chain=input comment="Drop everything else" disabled=no

If i try copy and paste don't work (see file)
What do i'm wrong?
Greatings
Plisken

paste in: not in:

Thanks for your help

Merry Christmas en greatings
Plisken