God old ethernet to the router?
Man its 2024, pretty sure that shits against the geneva convention these days. No joke when I suggested it at work as a troubleshooting step I was told off because it was an "OH and S risk". I rolled my eyes so hard I'm pretty sure it was audible 4 floors above and below.
imagining you doing the dishes and muttering to yourself "it's not possible! No it's necessary."