[B.A.T.M.A.N.] Blocking OGMs from a node for testing purpose

Hi all, I'm tring to make some tests on batman-adv with some stations, but I'm in trouble since I'm not able to "hide" a node to another. In other words I would like to create some personalized topologies to to test batman against them.

To do this, first of all, I should block OGMs from a particular station. I tried with ebtables in order to block all the packets with source MACa (where MACa is the MAC address of the station I would prevent to communicate with me), but I failed.

Does anyone know a working way to do what I described before?

Thank you so much!

Regards