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We are installing the application in the servers, but it doesn't work when App/Stage Servers connect to DB Server, could you help setup the firewall for the traffic between them? The connection information is as follows.
192.168.110.16(App2) to 192.168.100.21(DB) via 3306
192.168.110.17(App3) to 192.168.100.21(DB) via 3306
192.168.100.18(Stage) to 192.168.100.21(DB) via 3306
On the off chance that so then no it isn't duplicating information starting with one server then onto the next. A database see is an inquiry that pulls information ( normally from various tables ) and presents it as a solitary table.