Hello! I want to set up a pi-hole on my home and connect from my parent's. Both setups have a dynamic IP assigned by my isp and are different networks.

I have a couple of questions:

1. I can get a domain that updates automatically. But how would I resolve it on the client side?
2. Is there any way to authenticate on the server? By Mac maybe? That can be spoofed right?

Edit: my bad, thanks for correcting me, Mac is another layer completely

3. Can setting up a VPN solve both (1) and (2)?
4. Is there any other way?

Thanks!

I'm trying to learn/progress on shoulder inlocation on rings. Mostly because it looks awesome. In order to do that I'm doing deep german hangs on rings, each one for about 30 seconds. While Im trying to relax my shoulders and pecs, it seems that my neck, especially on the left side is really trying to contract, so sometimes it hurts my neck for a while.

Is this normal? Should I try to relax more?