Motorola MG8702 User Manual page 49

The firewall lets you set your protection level through IPv4 Firewall
Protection, for example. By default, with the Low setting, all services
are allowed. If you select Medium or High protection, the firewall will
block all services except those listed in the List of Allowed Services at
the bottom of the page. Select the desired protection level, and click
Save.
The higher protection levels will make it harder for attackers to
penetrate your network. You may find that if you select one of these
levels, that some Internet activities may fail. If that is the case, you may
need to use a lower level of protection during those activities.
Note that in order to play some games, you may need to turn
protection off.
When enabled, Port Scan Detection and IP Flood Detection will
generate reports in the Firewall Log if they detect attacks of their
respective types.