Let’s say I setup some subdomains and then point them to my home server via Cloudflare tunnel.
If I use one of those subdomains from my personal PC on the same network as my home server, to watch a movie for example, is all of that traffic going out to the internet and then back? Or does all the traffic stay internal once the connection has been made?
I would assume yes, it goes out to cloudflare and back in. You want to setup an internal DNS server on your network, and resolve your servers address to its local one. That way when your outside your network, you use the tunnel, and inside it goes direct.