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#Router and internal network protection, no internal servers, LAN is friendly
/ip firewall filter
add chain=input   action=drop   connection-state=invalid                         comment="Disallow weird packets"
add chain=input   action=accept connection-state=new         in-interface=LAN    comment="Allow LAN access to router and Internet"
add chain=input   action=accept connection-state=established                     comment="Allow connections that originated from LAN"
add chain=input   action=accept connection-state=related                         comment="Allow connections that originated from LAN"
add chain=input   action=accept protocol=icmp                                    comment="Allow ping ICMP from anywhere"
add chain=input   action=drop                                                    comment="Disallow anything from anywhere on any interface"
add chain=forward action=drop   connection-state=invalid                         comment="Disallow weird packets"
add chain=forward action=accept connection-state=new         in-interface=LAN    comment="Allow LAN access to router and Internet"
add chain=forward action=accept connection-state=established                     comment="Allow connections that originated from LAN"
add chain=forward action=accept connection-state=related                         comment="Allow connections that originated from LAN"
add chain=forward action=drop