No Physical firewal between them no.
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No Physical firewal between them no.
Have you tried disabling the software firewall both the source and destination?
Are you sure everything is configured correctly on the LanSchool software? I don't have experience with LanSchool but I would think that you need to have some software installed on the student computers as well -- right?
IP - Multicast
To use multicast for discovery or communication, you will need either to be in the same subnet/vlan or you need to enable multicast routing at the core with something like PIM.
Google "cisco configure protocol independent multicast".