Physics Simulation       Lecture 13B Networking Internet Basics IP - Datagrams TCP - UDP Application Layer Ports Java Networking URL InetAddress Sockets Client-Server RMI Exercises Lectures 1A: Introduction 1B: Java Intro 2A: BuildingBlocks 2B: Objects 3A: More Objects 3B: Exceptions        & Threads 4A: Waves 4B: Nuclear &        Particle 5A: AWT 5B: More AWT       & Graphics 6A:Detectors &       Simulation 6B: LHC/Atlas &      RandomSims     7A: Swing 7B: Java2D 8A: Java Apps 8B: Dialogs &     MoreClasses 9A: Java I/O 9B: Utilities,         Unicode 10A: More     Threading 10B: File     Handling 11A: Array,Print,     Images 11B: SimplePhysics     Simulation 12A: Tips &     Techniques 12B: More Tips &     Techniques 13A: Satellite     Simulations 13B: Intro to Java     Networking 14A: Java Servers 14B: HTTP Server 15A: ServerClient 15B: ServerClient    Expt.Simulation 16A: Course           Review 16B: ExerciseTest         Discussion     Contacts     Description     Exercises     Index     Outline     Q&A     Resources     StudentInfoForm     Student Pages     What's New

Home : Lectures : Lecture 13B : Ports Ports While the IP address will get the packet to the right computer, how does the packet get to the right program? A computer may have:    Several programs running at the same time    All trying to communicate via Internet    All going out the same physical ethernet cable The packets are guided to the correct program according to its port number. The port is a 16 bit number. It is occasionally seen on URLs     http://www.someplace.com:80/ 80 is the default so is usually left off. The various applications for particular protocols use standard port values: Unix machines reserve ports 1-1023 for standard services. Windows machines do not restrict their use but to make your Java programs portable, it is wise to use port values above 1023.

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