If your routes aren’t changing, then your device, as a client, isn’t going to reach anything. You’ll need to see a route for the 10.20.0.0/24 subnet show up that points to whatever the endpoint address is on the other end.

Nope, none shows up. I am looking via ip route, right?

So if that’s all your server config is, it’s only going to allow one peer at a time. You can confirm this by disconnecting your android device from the tunnel, and then connecting using the same info from your Linux device.

Just looked up the config created by opnsense. You were right. I had to restart wireguard to update the config file so that my other peers (like this debian machine) could connect. Thank’s for helping me out!

You also at a minimum should have PostUP and PostDown directives to properly forward incoming traffic on your wg interface.

That is hopefully managed by NetworkManager, isn’t?

1. my routes doesn’t change: default via 192.168.66.110 dev wlP6p1s0 proto dhcp src 192.168.66.211 metric 600 and 192.168.66.0/24 dev wlP6p1s0 proto kernel scope link src 192.168.66.211 metric 600.
2. After some seconds I can access the internet but not my subnet IPs I should be able to ping. So I was wondering if I am even using my VPN connection. I can observe my outgoing connections on my opnsense (but not when doing this on my computer, the device in question).
3. It just contains:

[Peer]
PublicKey = X
Endpoint = IP:NondefaultPort
AllowedIPs = 0.0.0.0\0,::/0

My tunnel address should be 10.200.0.13/32 once connected.

Yes. Then I imported said config additionally via nmcli connection import type wireguard file /etc/wireguard/wg0.conf which may be duplication.

I’ll be honest, this sounds interesting, but I have no idea what you’re even trying to say.

I am just sharing for the community. And I want some nerdish engagement tbqh.

Where does the $2700 price come from?

It was the manufacture price when I purchased it.

Does it support Linux or not?

It does but there are a few important things lacking. Also it isn’t stable without reading up on LKMS upfront and knowing what to do. Not all distros are capable of booting it yet (e.g. void).

Are you happy with it or not?

I poured ~$1200 to Qualcomm/Lenovo and they are employing one worker from one sub company. Interpret it on your own.

What’s LKMS?

RTFM. // Edit: I missspelled. LKML. I edited my post. Appreciated.

I’m really struggling to even parse the basics from your post.

I am open for sharing my insights, though : )