You can use the Yggdrasil network, cjdns or one of the other similar projects. This allows you connect to the network and reach all the other nodes if you can f

You can use the Yggdrasil network, cjdns or one of the other similar projects. This allows you connect to the network and reach all the other nodes if you can find a way to peer (wired or radio) with another node. To reach the traditional internet, you'll need someone else to provide a tunnel. But if your target also has a node in these networks you can communicate just fine.