We've been randomly having internet outages at home I've been trying to diagnose. About once a week (randomly), it becomes very unreliable for half a day. About 9/10 of packets get dropped when I ping a server, and the routers I test sometimes fail to obtain a DHCP lease for a long time.
It's unreliable right now. Connected my Ubuntu laptop directly to the modem and ran
tcpdump. Saw lots of ARP packets coming in from various routers on the subnet and pretty much nothing else. In some cases saw a DHCP request from my laptop without a response. Watched tcpdump every second for a while. There are about 5000 ARP packets received per second. Is this anywhere close to normal?
I'm suspecting it's related to the outage and also that it's crashing one of my routers, since I usually can't access its web setup page while it's connected to the modem. IDK what to tell the ISP support. The phone support people don't know what a "packet" is, and the problem always goes away by the time they can send a technician (though last the the technician didn't even have an ethernet port on his computer to test with).