59.11 Backend Connections

Connection Establishment

• Server Listens on an address:port
• Client connects
• Kernel does the handshake creating a connection
• Backend process "Accepts" the connection

In details:

• Kernel creates a socket & two queues SYN and Accept
• Client sends a SYN
• Kernels adds to SYN queue, replies with SYN/ACK
• Client replies with ACK
• Kernel finish the connection
• Kernel removes SYN from SYN queue
• Kernel adds full connection to Accept queue
• Backend accepts a connection, removed from acceptqueue
• A file descriptor is created for the connection

Also Read

• 59.29 TCP
• 59.19 HTTPS
• Open System Interconnection model