@techadmin There is a wiki page that covers this: https://wiki.fogproject.org/wiki/index.php?title=Multicasting
The other thing is your networking infrastructure. If all of your target machines are on the same subnet as your FOG server, then you are good to go. If they are on different subnets then you need to get with your infrastructure team and discuss setting up a multicast router or allowing multicasts to traverse your subnets. This is not something specific to FOG, but rather multicast data paths.
