Does the ISP see activity on the local network?

Question

Computer networks

Through the router, 5 PCs are connected to the Internet - part by wire, part by Wi-Fi. There is a conditional grandfather Vasily, connected to this network, who downloaded the LOIC (Low Orbit Ion Cannon) program or similar on his PC. Who in the subject knows - the program is used to test networks for "strength", and by cheerful schoolchildren - to disrupt computer science lessons. Grandfather Vasily enters the address of the router on the local network (192.168.0.1, for example) as the target of the attack, selects the type of attack, for example "UDP", and presses the coveted "Start" button. The network for all users immediately starts to slow down terribly (it is understandable), it becomes impossible to work. Grandfather Vasily's colleagues call the ISP and ask:
- Dear ISP, why is the Internet so slow here?
Actually, the essence of the question - can the provider determine that within the local network there is a DDOS attack on the router and the amount of traffic is abnormally large? And can the provider determine from which particular PC in the local network the attack is coming from? Can an ISP access router logs without knowing the router password?

Answer 1

Dear provider, why is the Internet so slow in our country?

An expensive provider will open a ticket in his tracker, check the ping to the router, see that everything is fine, call you back, say that everything is fine with him, but if you want, we can send a specialist, blablabla. It is completely parallel to the work of your LAN - who is ddosing whom and why.
Maybe if this is his router - in this case, he will immediately see the load on the internal interface in the monitoring - or if the admin is a sucker and has not changed the password (and where you can login) of the administrator.

Answer 2

Well, judging by the post, you are not far from these cheerful schoolchildren left.
On the subject: some small providers can also cut off your network so that traffic is not sucked in vain. The big ones don't care.
They can easily access their router. If it is yours and you were smart enough to change your password, relax.