DoS attack, Teardrop or derivative, Ping of Death, strange non-DHCP IP address connected to wifi

"By default, the router uses port scan and DoS protection (it is enabled) to help guard a network against those attacks that inhibit or stop network availability. If someone selects the Disable Port Scan and DoS Protection check box on the WAN screen, that disables the protection."

That is from the netgear site. The default factory settings on the router I received had it checked. I did not change it. On my other netgear routers it is unchecked as delivered which is correct. I'm getting the dos attacks and port scans on the new router as described by others in this post.  Having these disabled by checking that box, may have contributed  I now can not stop these attaacks as others in this post have said.  IOS devices have their ips on the router changed which seems like a virus on the router. I will update the firmware and NOT check the box

This advice is not true. Click on the 'show/hide help center and it says only disable port scan and dos protection in rare occassions. DO NOT CHECK THE BOX.