[zinekeller]

Except that P2P mode tends to simply not work in cases where both of the clients are in CGNAT networks (unless both of them happens to have IPv6 addresses). Even Tailscale acknowledges this sad fact (https://tailscale.com/blog/how-nat-traversal-works#have-you-...) because in practice CGNAT operators deploy an endpoint-dependent NAT (aka symmetric NAT) without the possibility of port mapping.

[viraptor]

You can use Zerotier which doesn't have the problem. Some public nodes will assist with the nat traffic. It's not an ideal situation to be in and it's a bit slower, but at least it will work.