application protocol developed by Oracle. It provides a transparent TCP connection between a client host and a database server, or between one database and another. There are two primary differences between SQL*Net v1 and v2. Version 1 uses 1525 as the default destination port, and version 2 uses 1521. Another difference is that version 1 uses static port binding, version 2 uses dynamic port binding; that is, after the client and server conclude the TCP handshake on port 1521, the server sends a message that specifies a dynamically assigned host IP address and port number. When the NetScreen device receives this message, it creates a gate, or "pinhole", in the firewall at that port number through which it allows SQL*Net v2 queries to pass.
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