Thank you for your answer Josh.
Yes IGMP is enable.
I have try this:[url]http://www.fogproject.org/wiki/index.php/Troubleshooting_a_multicast[/url]
With two client, only one start the communication with the server and the other was still waiting.
I thing that the IGMP protocol work well.
But what is the fonction of multicast manager?
Is it an important part of the process?

Hello,
I try to find why the multicast deploiement don’t work.
I have done: [B]ps aux | grep FOG[/B]
the answer is:[B] root 5081 0.0 0.1 3332 808 pts/0 S+ 10:50 0:00 grep --color=auto FOG[/B]
I have try to this command: /etc/init.d/FOGMulticastManager start
But the answer is: [B]* Starting FOG Computer Imaging Solution: FOGMulticastManager [fail][/B]
Does anyone have suggestion to make it work?
Have a nice day