Dear Arnaud,
I had the same problem, but I had solved the issue.
1. ARP works, but not Ping
. refer to the below page
2. Passthrough mode, using eth0 & eth1
. apply the eth0/eth1 with the different network IP
. for example, eth0 = X.X.1.101 / eth1 = X.X.2.101
I hope this is helpful to you.
Best Regards,
Eric.