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> - any idea if my problem is in the nova configuration, or something to
> do with the hypervisor iptables rules ?
> - done something similar with good result ?
> - any idea on what to try next ?

Actually adding an iptables entry on the hypervisor so packet coming
from the floating ip network were masqueraded did the trick:

-A POSTROUTING -s 192.168.123.0/24 ! -d 192.168.123.0/24 -j MASQUERADE