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+TCP KeepAlive: Keeps TCP Alive.
+
+A timer is set up together with the TCP connection, if the timer reaches zero a probe packet is sent without any data. It has a flag set for ACK. The peer only has to support TCP/IP, not specifically keepalive. If alive it will respond with a zero data packet as well that has the ACK flag set.
+
+Because TCP lets your program handle a stream, not packets, a zero length data packet is not dangerous for the program listening on the socket.
+
+Two use cases for keepalive:
+- Detecting dead peers
+- Prevent disconnects due to inactivity \ No newline at end of file