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There is one last detail in Listing 3 1 that you might be curious about: why is the server careful to set the socket option SO_REUSEADDR before trying to bind to its port You can see the consequences of failing to set this option if you comment out that line and then try running the server. At first, you might think that it has no consequence. If all you are doing is stopping and starting the server, then you will see no effect at all: $ python tcp_sixteen.py server Listening at ('127.0.0.1', 1060) ^C Traceback (most recent call last): ... KeyboardInterrupt $ python tcp_sixteen.py server Listening at ('127.0.0.1', 1060) But you will see a big difference if you bring up the server, run the client against it, and then try killing and re-running the server. When the server starts back up, you will get an error: $ python tcp_sixteen.py server Traceback (most recent call last): ... socket.error: [Errno 98] Address already in use How mysterious! Why would a bind() that can be repeated over and over again at one moment suddenly become impossible the next If you keep trying to run the server without the SO_REUSEADDR option, you will find that the address does not become available again until several minutes after your last client connection! The answer is that, from the point of view of your operating system s network stack, a socket that is merely listening can immediately be shut down and forgotten about, but a connected TCP socket that is actually talking to a client cannot immediately disappear when both ends have closed their connection and initiated the FIN handshakes in each direction. Why Because after it sends the very last ACK packet,
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CHAPTER 3 TCP
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the system has no way to ever be sure that it was received. If it was dropped by the network somewhere along its route, then the remote end might at any moment wonder what is taking the last ACK packet so long and re-transmit its FIN packet in the hope of finally receiving an answer. A reliable protocol like TCP obviously has to have some point like this where it stops talking; some final packet must, logically, be left hanging with no acknowledgment, or systems would have to commit to an endless exchange of okay, we both agree that we are all done, right messages until the machines were finally powered off. Yet even the final packet might get lost and need to be re-transmitted a few times before the other end finally receives it. What is the solution The answer is that once a connected TCP connection is finally closed from the point of view of your application, the operating system s network stack actually keeps it around for up to four minutes in a waiting state (the RFC names these states CLOSE-WAIT and TIME-WAIT) so that any final FIN packets can be properly replied to. If instead the TCP implementation just forgot about the connection, then it could not reply to the FIN with a proper ACK. So a server that tries claiming a port on which a live connection was running within the last few minutes is, really, trying to claim a port that is in some sense still in use. That is why you are returned an error if you try a bind() to that address. By specifying the socket option SO_REUSEADDR, you are indicating that your application is okay about owning a port whose old connections might still be shutting down out on some client on the network. In practice, I always use SO_REUSEADDR when writing server code without putting thought into it, and have never had any problems.
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