Agent info between networks

Greets,

I've a OCS server to collect info about computers in my school. I've got a diferent network in one classroom and teacher's PC makes NAT to routing to the other network (it's the router of the classroom).

When i install ocs agent in one PC of the classroom they sent info to server, but when i install next one it's info substitutes before one and i just can collect info of one of them...

Thetre's any way to collect info of all of them although there's a router in the middle?

PCs have got a Debian 9 installation (even teacher PC/router)

Thanks