Getting DDoS attacks constantly.

It is just a cable modem. No integrated router to clash with your Netgear router.

I mentioned it because of the DHCP IP: 10.0.0.10 entry in your log. During set up most routers allocate a default IP address of 192.168.1.1. DHCP address pool then pick up from this.

"If the router detects a conflict with a WAN IP address, it changes its IP address to 10.0.0.1 or 172.16.5.1," according the manuals.

I am a bit puzzled, your first message said:

I am having trouble changing my IP address. Someone keeps crashing my pc.

But the subject is

Getting DDoS attacks constantly.

It isn't clear to me that the two are related. Which one do you want to fix?

I see  no sign that you have tried this problem over in the appropriate section for your RAX120.