[userbinator]

The washing machine REALLY liked talking to... itself? I don't think whoever engineered their networking stack knew what a loopback interface was, because it was sending a lot of traffic from itself to its own IP address. I didn't think this was relevant, so I ignored it. It really liked sending traffic to 255.255.255.255 every second, for some reason. Again, ignored

Are those gratuitous ARPs? This is a common behaviour.

[gibs0ns]

That was my exact thought. I've seen this a lot on IoT devices, to detect IP collisions/changes.

[timedout_uk]

Possibly, I completely forget ARP exists most of the time. I didn't pay much mind to it anyway, I was too bemused at the constant requests from/to its own IP rather than using loopback