Debug an issue

RouterOS General
1

In my default Rules of Mikrotik,
Default Rules of Mikrotik,
ip firewall filter Rules> add
#1chain=input protocl=1(icmp) action=accept
#2chain=input in.interface=ether1(gateway) Connection State=established action=accept
#3chain=input in.interface=ether1(gateway) connection state=related action=accept
#4chain=input in.interface=ether1(gateway) action=drop

These #4 rule drops 34.4 MiB Bytes with of 478663 Packets in ether1,
Is this due to my ISP problem,
or some one trying to inter in my Firewall,
How can I find out which IP or machine is giving me traffic ?

2

Add a new filter rule before #4 to log the remaining traffic.
ip firewall filter Rules> add
#1chain=input protocl=1(icmp) action=accept
#2chain=input in.interface=ether1(gateway) Connection State=established action=accept
#3chain=input in.interface=ether1(gateway) connection state=related action=accept
chain=input in.interface=ether1(gateway) action=log
#4chain=input in.interface=ether1(gateway) action=drop

Then open the logs to see details.