alt textGood news everyone !
One more time, FOG was not faulty but the NETWORK …
After checking again Forums on multicasting and similar problems, I’ve found the solution :
The querier switch must have an IP adress on the subnet …
Once I’ve made the change, I tested a 4 client multicast session : total success !
So I tried with a classroom of 19 clients : in 30 min ( 1.5Gbps/min, max speed with 100Mbits connections ), all images were downloaded !
So, maybe it would be interesting for others to include these advices in the wiki or the troubleshooting Multicast page :
enable IGMP snooping on VLAN concerned in all switches
Choose 1 "master switch ( for me the all gigabit one under fogserver ) and make the following only for this one :
assign an IP adress to the VLAN in the switch configuration in the subnet range
enable IGMP query on the VLAN
verify the switch has Active Group Addresses
Enjoy !!!
Thanks again at all the FOG team