Although the answer has nothing to do with batman-adv or layer 2
services/setup you may want to look into a radius server for your network.

Batman-adv has no relation to how dhcp works.

On 06/15/2014 05:19 PM, Jan Lühr wrote:
> Hello,
> 
> we're running batman 2013.4, having multiple Gateways. For doing so,
> we'd like to monitor the availability of every dhcp-server on each Gateway.
> 
> I noticed: If DHCP-Packages (even unicast ones) that unicast
> DHCP-Requests / Discovery are unanswered, if
> -> they're sent locally on a gateway
> -> sent to a gateway not "chosen" (according to batctl gwl) by the
> monitoring host.
> 
> What's the best way of monitoring all DHCP-Servers? Is there a way to
> set up a monitoring node, that can reach all DHCP-Servers?
> If not, how can request an ip address locally?
> 
> 
> Thanks,
> Greetz, Jan
>