0到33600端口详解（Port 0 to 33600）.doc

0到33600端口详解（Port 0 to 33600） In the network technology, port (Port) generally have two meanings: one is the physical meaning of the port, for example, ADSL Modem, hubs, switches, routers and other network devices used to connect the interface, such as the RJ-45 port, SC port and so on. Two is the logical port, generally refers to the TCP/IP protocol port, port number range from 0 to 65535, for example, for browsing web services. In the network technology, port (Port) generally have two meanings: one is the physical meaning of the port, for example, ADSL Modem, hubs, switches, routers and other network devices used to connect the interface, such as the RJ-45 port, SC port and so on. Two is the logical port, generally refers to the TCP/IP protocol port, port number range from 0 to 65535, for example, for browsing web services. View port In Windows 2000/XP/Server 2003, to view ports, you can use the Netstat command: Click start to run in turn, type CMD and enter the carriage, open the command prompt window. At the command prompt, type netstat -an, and press enter to see the port number and status of the TCP and UDP connections displayed in digital form. Close / open port In the various port before, here to introduce how to close / open ports in windows, because by default, there are a lot of unsafe or not what port is open, such as Telnet services, FTP services 23 port 21 port, port 25 SMTP services and RPC services 135 port and so on. In order to ensure system security, we can close / open the port by the following method. Close port For example, in Windows 2000/XP, closing the 25 port of the SMTP service can do this: first, open the control panel, double-click the administrative tools, and then double-click the service. Then in the service window to find and double-click the Simple Mail Transfer Protocol (SMTP) service, click the stop button to stop the service, and then in the startup type select disabled, then click OK button. Thus, shutting down the SMTP service i