Cable Modem/Router

Your cable modem/router has identified what it believes are attacks from a variety of sources.  Two of those addresses belong to Amazon, one to Verizon and another Grande Communications Networks.  It's a bit unusual but probably not unheard for an attack to originate from legitimate companies such as these.  This is why some of us here believe that the DoS attack detection logic in Netgear's code might occasionally be too aggressive in labeling something as an attack.  Whether or not this is true, your router has stopped these "attacks".  The truth of the matter is that the Internet is a dangerous place and attacks like these are not uncommon.  There's really nothing you can do to stop them from coming.  You can only trust that your router will do its job to keep them out of your network.