Those links mean that instead of communicating through Internet pipes run by ISPs, that communication is completely free. Further, any peer can connect with any other peer. So as peers join up, the network grows. Eventually if one peer in this cluster also has an Internet connection, then the network also does. Obviously bandwidth constraints limit infinitely sharing one ISP account with an arbitrary number of people. However, if that peer has purchased space within a data center, a cloud-hosted machine, then Internet access is realistic for those currently without access. In effect it not only allows nodes to connect, it allows any node to provide Internet.
So, the ultimate aim is not to replace the Internet. And it's not to piggy back on the Internet. It's simply to let computers communicate freely.
And part of free communication, in every sense of the word, is that communication must be encrypted. One node must be free to communicate directly to another without others listening. The idea of free speech is not merely to allow freely speaking to the public or a group, it's to allow individuals to communicate amongst only each other, while at the same time not restricting them from communication to a wider audience should they choose.
The way this security is implemented is through IPv6. Each IP is associated with a public key and shared secret. It would be feasible to incorporate a negotiated secret. But as part of the initial phase, the idea is to test the core of the project: cjdns (on Github as https://github.com/cjdelisle/cjdns/). This "invite" system, in effect, controls the spread of meshnet and limits the possibility for abuse of the network, since each member of a meshnet must share a secret to bring a new node in.
Plans are underway for rapid expansion of the meshnet. But careless growth is not possible, due to the current nature as a circle of trust, and importantly, the ability to de-peer malicious users.
This basic model of adding peers and sharing secrets is now being automated. And I'd tell you their specific plans, but that's a secret. Pass it on.
2. if you learn of others with meshnets, you can then peer to the other group, then you're all linked together. Repeat.
3. The steps you just did, those can be automated so that you automatically peer with the whole planet. However, that's complicated to build. But it's being built. Join HypeIRC #qmai or #cjdns to discuss. To join hype IRC you need to peer with the Hyperboria meshnet, as HypeIRC is not broadcast to the Internet. There are links to public IRCs to find peers if you know none (start at http://projectmeshnet.org). You're free to automate this with your own group of trusted peers too. Hope to see you on HypeIRC soon.
Private meshes usage doesn't grant mass media attention so I don't see why a bunch of hackers communicating freely on their little line grant them a better "free speech to change things" than the other 99%. Private meshes aren't tools to raise awareness but tools to have a different network. It all depends on the message you want to send and the recipients you want to reach.
Right now private meshes users are much less than 1% of the population anyway.
But it could grow fast in dense urban zone. I can foresee some weekends of hacking and configuring routers at home for the coming months.
But meshnets are a very interesting area of research. It can only be a good thing to remove the main gatekeepers (ISPs) out of the equation.
I wonder if you could take advantage of the opening up of various whitespace spectrums (thinking specifically in the UK, but I imagine this is happening elsewhere in the world).
I don't really understand what CJDNS does, and for the short term you can't really participate in the meshnet without a pretty solid understanding of the technologies involved, but I personally know quite a few people in central Seattle who would be happy to host repeaters if the meshnet people can get a turn-key installation package set up. I hope they'll reach that point soon.
A good example of a sizable meshnet is the Athens Wireless Metropolitan[1] network which has more than a thousand backbone nodes.
1: http://en.wikipedia.org/wiki/Athens_Wireless_Metropolitan_Ne...
I suppose it would take meshnets to a whole new level.
However, WiMax is not a mesh network, although you can obviously use WiMax as a physical link on top of which a mesh protocol can work.
Could it be interesting to have the main project leaders set up a website allowing everybody to pay hackers to come to your home and set up the required equipment ready-to-use?