Can the provider's wire hang up the router?

Question

Computer networks

Today my internet went down. Provider crash. This is of course nonsense, but that's what interested me. If you ping the router, then half of the packets are lost, and if you remove the provider's cable, then the ping to the router goes stably and without loss.
Question: what can a provider do at home that I have a web muzzle of a router and ping starts to work unstably when a cable is connected?
Router RT-N66U official firmware, 3.0.0.4.374_720

Answer 1

Firstly, the number of icmp echo reply responses from the router depends not only on the "load" of the network, but also on the load on the router itself and its settings (rate-limiting, qos, etc). Therefore, you should never rush to conclusions when some part of the "pings" "disappears".
Secondly, it is likely that the provider's equipment is sending you some kind of traffic (for example, lldp) that your router is trying to process, utilizing precious CPU cycles in the process. If possible, you can specify the details of the processor load (which process consumes the most processor time). You can also plug the provider's cable into a computer running wireshark and see what kind of traffic is coming to you.

Answer 2

I would also like to add that the provider can be only indirectly to blame, for example, if problematic traffic (ipv6 ndp messages, dhcp messages, etc.) is generated by your neighbor on the switch.

Answer 3

managed equipment does not like arp and multicast flooding very much.