The firewall in default settings is good to go.
Why do you want to add more rules. What is the requirement or what is the fear?
What are you trying to avoid??
Hm some one ddosed me with udp flood . and if i block this manualy under attack ppl just littl lag and nothink more. but if i no block they dropped.
idk maybe i jsut need script like "if i have above 4k conections ip to my router > router will start block all udp" bad guy ddosed about 1-2 min with free "ip stress" site.
anyway i just dont wanna drop any players from game cus game can be more 2 hours.