If a Standard virtual server is configured with Layer 7 functionality, such as an HTTP profile, the client must send at least one data packet before the server-side connection can be initiated by the BIG-IP LTM system.
Note: The BIG-IP LTM system may initiate the server-side connection prior to the first data packet for certain Layer 7 applications, such as FTP, in which case the user waits for a greeting banner before sending any data.
The TCP connection setup behavior for a Standard virtual server with Layer 7 functionality operates as follows: the three-way TCP handshake and initial data packet are processed on the client side of the connection before the BIG-IP LTM system initiates the TCP handshake on the server side of the connection.
A Standard virtual server with Layer 7 functionality processes connections using the full proxy architecture. The following TCP flow diagram illustrates the TCP handshake for a Standard virtual server with Layer 7 functionality:
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