Have you tried to set every node with static ip but also providing dhcp
server to a range of ips ?
For example: node 1 from 192.168.1.1 to 192.168.1.10 then node 2:
192.168.1.11 to 192.168.1.20 and so on.
On 07/18/2012 09:18 PM, Geneviève Bastien wrote:
Hi!
I had a chat the other day on IRC about how to assign ip addresses
whether there is an internet gateway available or not.
Here is the problem and the solution I came up with. Let me know if that
makes sense or if I'm complicating my life.
* Problem *
Our network is still small, there may or may not be an internet gateway
available on it, it doesn't matter. From what I read here
http://www.open-mesh.org/projects/batman-adv/wiki/Gateways for nodes to
have access to the internet, the internet gateway has to be a dhcp server.
The node requests an ip by dhcp and then knows what the default route
is. But if the gateway disappears, there is no more dhcp server, the
nodes do not have ip addresses and the mesh network is about useless.
But if I set nodes with static ips, then the mesh is routable all the
time, but nodes do not know the default route to reach the internet.
Am I right so far?
* Solution *
Someone on irc pointed me out to this page:
http://www.open-mesh.org/projects/batman-adv/wiki/Uevent
I use this uevent to send a dhcp request if a gateway becomes available
or go back to a static ip if all gateways are gone.
Attached is the hotplug script I use. It is in
/etc/hotplug.d/net/99-batman-adv-gw. It supposes the interface is
configured by default with a static ip.
It works perfectly, but I can't believe there is no simpler solution to
this. Our problem should be a quite common one. What is the general
solution to it?
Thanks,
Geneviève
