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Fake response help

An application as a client sends and receives data using the Raknet protocol. The client sends 3 details to the server before a successful connection. One is the IP address and one is HDD serial. I don't know what is the third detail. I tried using Wireshark to find out but was unable to as I used it for the first time. I want to figure out what third detail is sent by the client. How can I do that?

After a successful connection, the server then checks all the three things sent by the client from the database. If any is present, the connection is closed immediately. I was able to tamper by IP address and HDD serial but the third thing gets me kicked. I want to tamper that too. How can I do that?