----- Forwarded message from Paul Gardner-Stephen ----- Date: Mon, 14 Oct 2013 21:20:34 +1030 From: Paul Gardner-Stephen To: serval-project-developers@googlegroups.com Subject: Re: [serval-project-dev] Roaming between mesh extenders Message-ID: Reply-To: serval-project-developers@googlegroups.com Hello, On Mon, Oct 14, 2013 at 8:56 PM, Paul Gardner-Stephen < paul@servalproject.org> wrote:

Hello,

On Mon, Oct 14, 2013 at 4:47 PM, Eugen Leitl wrote:

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Hello,

On Mon, Oct 14, 2013 at 4:41 AM, Miles wrote:

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Is each mesh extender supposed to have a distinct ip range for the

On Mon, Oct 14, 2013 at 07:39:41AM +1030, Paul Gardner-Stephen wrote: public

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network? That's what commotion &etc do.

We haven't done that yet. Partly because in a large network there just aren't enough IPv4 addresses to support unique IP ranges for each. We can of course still greatly reduce the probability of a nearby collision by doing so, and so probably should, and possibly randomise on boot.

Have you looked into cjdns way of doing things?

No, we haven't. We are quite happy to apply a more sophisticated approach than we do now for this. From a pragmatic perspective it might make sense for us to just copy what Commotion do. I don't know if they are using cjdns.

Just a followup having read a little more about cjdns now -- basically Serval doesn't need cjdns because the Serval overlay mesh network uses public keys as network addresses. Being an overlay, it is also possible for us to use arbitrary transports, and not have to worry about needing root access on a device. This means that we can make a 1st-class Android mesh client that doesn't need root, for example. The use of public keys as network addresses means that all communications can be encrypted and authenticated without any further complications. The use of IP on Serval mesh nodes is just to provide something for the mesh to tunnel over, so the IP configuration is not interesting to us, and can be configured however the user otherwise wishes if they want it to interoperate with some existing IP network or mesh. Paul.

Paul.

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