Netgear c6300v2 unable to block DoS attack

I am dealing with a ICMP attack on my router and I have tried to use a different IP address via DHCP. Somehow they found my IP not long after and resumes attacks, after which I made sure that both Disable Port Scan and Respond to Ping are unchecked. I toggled these as well and briefly was without DoS attack, but about an hour later I am still getting requests from a handful of IP addresses. Is there anything else here I should be doing to stop these incoming requests?