On Thu, 5 Dec 2013 18:27:51 +0100 Thomas Glanzmann <thomas@xxxxxxxxxxxx> wrote: > Hello Stephan, > > > Bridging doesn't like loops, and you have created a loop. > > I agree. It was actually a Microsoft Load Balancing cluster that created > the loop. Michael told me that the physical switch works because it: > > a) broadcasts > b) sends it to both ports. > > > If you are goin to mess around using ebtables, just write another rule > > to drop the reflections. > > Michael said that ebtables only after the bridge has seen the packets > and so is not applicable. Is that true? So should I use arptables. I > tried to block the looped packages by: > > - iptables > - arptables > - eptables > > But somehow I never made it. Do you have an example for me or can tell > me which of the 3 tools should work, so that I can try again. The NATing > fought the symptoms of my problem. > > Cheers, > Thomas No example. You can also define static fdb entries with lastest kernel/iproute and that would problably pin the entry.