Âthanks for your quick answer, I'll try to be more clear.
In the attached image you can see a short map of our campus.
In Zone A we have the Central Manager (which at the moment is the submit node too), and the main execute nodes, the CM has the private IP 192.168.31.100 and is mapped to the public IP: 180.101.18.XXX, all the execute nodes in Zone A have IPs in the net 192.168.31, so they can contact the CM directly using the PROVATE_NETWORK_NAME.
The Zone B is another building in the campus, there are some laboratories which we want to add as execute nodes to the CM in Zone A, this nodes are behind a Firewall which have the Department's Campus IP (192.168.91.XXX), and all the PCs have IPs in the nets 172.17.*).