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Hi,

I don't have an answer, but here are a couple of troubleshooting tips:

- use iptables-save -c to see which chains are being hit. Do a ping and run 
iptables-save -c again to see which counters increased.

- use tcpdump to find out where the packets are getting lost. You could start 
with the physical interface used in br-ex. If the packets are being sent out 
there ok, then move on to the next stage. At some point they are getting lost 
either going out or coming back.