Thank you for the information. I will try with your patch. However it seems very strange that the raw installation of Zeroshell gives me such problems with a simple NAT/loadbalancing. I am pretty sure that something in my configuration is wrong. After all I am just pinging… and there is no reason to loose packets.
Could anyone try WinMTR on his system to see if it has the same issue ? I ran WinMTR, I specified an interval value of 0.2 instead of 1.0 (in the options menu) and then I simply tried to ping http://www.google.com.
On the route, all nodes gives me 0% loss except the very first node… the one that corresponds to the NAT traversal….