There is not enough information in order to help you.
What is a "weird IP address" ? Do you mean an IPv6 one, one assigned by your cellular provider, or one local to your LAN?
How does an external attacker dos attacks "diff targets" on your network if you use internal, non-routable IP addresses? If you are forwarding ports to them, stop and no external IP will be able to reach them (unless they are already compromised).
There is no easy way to stop a dos attack or portscans, a newer router with updated firmware will provide some degree of protection.
I don't know what you mean by "plus still attacking several dif targets," are you saying that you are compromised and attacking others? If that is the case, start with the clients, run anti-virus, Malwarebytes, etc. Update the router firmware (some have vulnerabilities), change the admin password, disable remote administration.
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