"This means you can use it to create inbound network tunnels to computers that don't have a public IP, are behind firewalls or get assigned new IPs frequently."

"This means you can use it to create inbound network tunnels to computers that don't have a public IP, are behind firewalls or get assigned new IPs frequently." Sure enough, look what appears on HN front page a few hours later... https://news.ycombinator.com/item?id=22167627 https://news.ycombinator.com/item?id=22167627 People's home public IP addresses are not universally reachable/accessible^1 from the internet. It varies. What does "reachable/accessible" mean. It means that transferring a file would be as easy as person A typing something like nc -lnp [port] [person A home IP adddress] < file and person B typing nc -w1 -vvn [person A home IP address] [port] > file where port is not one that is blocked, e.g., 80, 25, etc. and is known by both persons. Regardless of what anyone says in an HN comment, in the real world, people at home are sometimes behind firewalls, or other software that performs NAT, that are running on computers that do not belong to them and are not under their control. That's why WG has persistent keepalives. No one answered that question.