How to tell if your internet is being ddosed?

You asked - How to tell if your internet is being ddosed? It can be answered as a DDoS attack basically means the connection to your computer is saturated. There are several ways to do this but the result is the same: nobody can access your router and you may possibly not be able to go on the Internet (roughly speaking). No hacking is involved, once the DDoS stops you recover (you may need to reboot your router). So this is not "hacking" as per the movies, just a way of blocking access.

You may see some logs on your router (if you have any) but they may not be obvious. If you see a lot of traffic coming in it may be a DDoS. You may also not see much in the logs, it really depends on the attack. If you are a home user you can file a complaint with your ISP but basically you need to wait until it is over. If this is repeated then you definitely should talk to your ISP (you cannot do anything yourself to protect against a DDoS). Since you see that there are strange activities within your LAN (short of lack of Internet access) then it may be that this is not a DoS. Your WiFi may have been breached but this means that the attacker is nearby (as opposed to a DoS which can be done from the other side of the globe). Your first measure is to make sure you use WPA2 (see the configuration of your router) and a looooong password. If your internal network was compromised (ie. someone connected to your WiFi and possibly hacked other devices in your LAN) then the best thing to do is to reinstall the OS from scratch (particularly MS Windows and Linux).