2020-02-04 09:00:49 [Error][Alarm-Log] AlarmID:303500,AlarmLevel:Error,DoS attack. Type: smurf. Source IP address: 192.168.1.102. Destination IP address: 192.168.1.255. Source MAC address:
These IP addresses are internal to your network. The 102 address is a machine on your network, the 255 address is the broadcast address of your internal network (the address that something scanning your network for vulnerable hosts would use)
What machine on your internal network has the IP address 192.168.1.102