DoS attack, Teardrop or derivative, Ping of Death, strange IPv6 Parsing Solution

I have found a solution to this two year old, unresolved problem:

https://community.netgear.com/t5/Cable-Modems-Routers/DoS-attack-Teardrop-or-derivative-Ping-of-Death-strange-non-DHCP/td-p/1067681/highlight/true

Summary of problem:

Router logs will show DoS attack, Teardrop or derivative, Ping of Death coming from a strange IP address.  When you trace this IP, it will be weird from a foreign country.

The router will keep dropping connection due to these assumed D-DoS attacks.

Problem has not seen a firmware fix in two years.

Root Cause:

fqm889identified the root cause as firmware bug, where Netgear mis-parses IPv6 address.

ipv6 address:

xxxx:xxxx:aabb:ccdd:eeff:gghh:xxxx:xxxx

Change aa bb cc dd ee ff gg hh from heximal to decimal AAA BBB CCC DDD EEE FFF GGG HHH

Then you can find that AAA.BBB.CCC.DDD is your source and EEE.FFF.GGG.HHH is your destination of 'DoS' packets.

User fduate has provided a graphical represenation in the attached PNG photo.

Solution:

Self-assigned IPv6  addresses are causing this issue, and this is resolved by enabling DHCP for IPv6. 

Navigate to:

Admin Panel > Advanced Tab > Advanced Setup > IPv6 > IP Address Assignment

Then click "Use  DHCP server".

Copy "Router delegated prefix" (The value usually ending in /64)

Paste previous value in "Start IP Address" and edit last three characters "/64" to "3/60".

Click "Apply" and reboot.

Enjoy!