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I. I/O portA port is the address of a register in an interface circuit that can be accessed directly by the CPU. Almost every peripheral is made from a register on a read-write device. The CPU sends commands to the registers in the interface circuit through these addresses, namely ports, to read the status and transmit the data. Peripheral registers, also known as "I/O ports", typically include: control reg
One, I/O ports Port is the address of a register that can be accessed directly by the CPU in an interface circuit. Almost every peripheral is done by reading and writing registers on the device. The CPU sends commands to the registers in the interface circuit through these address ports, reading status and transmitting data. Peripheral registers, also known as "I/O por
In network technology, port has two meanings: one is physical port, for example, ADSL modem, Hub, switch, router is used to connect other network equipment interface, such as RJ-45 port, SC port and so on. The second is the logical port, which generally refers to the port in the TCP/IP protocol. The port number ranges from 0 to 65535, for example, port 80 used to browse Web Services, port 21 for the FTP service. Here we will introduce the logical port. To view the port in Windows 2000/XP/Server
use VSPD this tool on Windows virtual out 2 connected serial port, that is, a serial port pairThen connect the 2 serial ports on VMware, at this time for VMware, these 2 Windows serial port is 2 physical serial port, add serial device when the use physical serial port is selected. Once added, start the virtual system and connect the 2 serial devices. Then look at how the 2 serial ports are mapped in Linux
A firewall (iptables) is a system service located at:/etc/init.d/iptablesFirewall configuration information, saved in this file:/etc/sysconfig/iptablesThe Firewall service start, stop, restart, query status, save configuration and other commands as follows:# Service iptables start/stop/restart/status/saveLinux Firewall Open specific ports (iptables)Service iptables Status View firewall stateService iptables start to turn on the firewallService iptable
first, port and service relationships The corresponding relationship between the port number and the corresponding service is stored in the/etc/services file, where most of the ports are found. Using the netstat command The name of the service displayed is also found from this file. Some people say that you can disable the port number in this file by commenting out the corresponding port numbers. I tried but did not work, this method should be no u
Nginx is a lightweight WEB server, reverse proxy server and e-mail server, this article describes the use of different ports in the virtual machine to simulate different servers, and the use of Nginx reverse proxy function to achieve server load balancing effect. Create a new two sites First, create two WEB directories as sites under different servers, one is website-a, and the other is website-b. These two site directories should be on different se
In the previous 9 articles to share with you the construction of the 2008 DC and the core mode of some applications, when we have to deploy infrastructure services for the enterprise to be safe to start Windows Server 2008 with Windows Firewall, and many enterprises will also Deploy some security-resolution products (such as ISA) separately. So, to do a good job of the deployment of these products, we need to understand the Active Directory services and the network connection port on the DC, so
By default, Windows opens many service ports on our computers. Hackers often use these ports for intrusion. Therefore, understanding port knowledge will help us improve internet security. First, let's take a look at what is a Port: In network technology, a Port has two meanings: one is a physical Port, for example, ADSL Modem, Hub, switch, router and interfaces used to connect to other network devices, such
Daemon Service Program". The network daemon used by Redhat Linux 9.0 is xinted (eXtended Internet daemon). The xinted mode is also known as the Internet super-server (super server) compared to the stand-alone mode. XINETD can listen to multiple specified ports at the same time, when accepting user requests, he can initiate different network service processes to handle these user requests depending on the port requested by the user. You can think of x
The protection port ensures that no communication is made between the ports on the same switch. The protection port does not forward any transmissions to other protection ports, including unicast, multicast, and broadcast packets. The transmission cannot take place between the second layer of protection ports, and the transmission between all protected
Tags:. com pre BSP min HTTP Ports Dev Post GPOThe way it was used before is this http://www.cnblogs.com/zqb-all/p/7073612.htmlThese two days to see the parameters of the minicom, you can directly use the-D device, so modified into suchCreate a hidden file ~/.zqball_minicomCOM () {Ports=`ls/dev/ttyusb*` SelectPortinch$ports; Do if[$port]; Then
Interpreting L2 Ethernet ports and link types with experience L2 Ethernet port Vswitches include Access, Trunk, Hybrid, and QinQ layer-2 Ethernet ports. In this section, the Ethernet ports of the first three L2 switches can be added to a specific VLAN Based on the port VLAN division method. However, only the Hybrid ports
1. Port 21:Port Description: port 21 is mainly used for FTP (File Transfer Protocol) services.Suggestion: Some FTP servers can be used by hackers to log on anonymously. In addition, port 21 will be used by some Trojans, such as Blade Runner, FTP Trojan, Doly Trojan, and WebEx. If you do not set up an FTP server, we recommend that you disable port 21.Port 2 and port 23Port Description: port 23 is mainly used for Telnet (Remote logon) services.Suggestion: using the Telnet service, hackers can sear
Iptables is a firewall under Linux and is also the service name. Service iptables Status View firewall stateService iptables start to turn on the firewallService iptables Stop shutting down the firewallService iptables Restart Restart firewallFirewalls Open specific ports:① file/etc/sysconfig/iptables② Add:-A rh-firewall-1-input-m state--state new-m tcp-p TCP--dport 8080-j ACCEPT★ The number 8080 for open 8080 port, can also be changed to other
Look at the port:Ps-aux | grep TomcatA tomcat process with no 8080 ports found.Use command: NETSTAT–APNView all process and port usage. Discover the following list of processes, where the last column is Pid/program name8080 ports were found to be occupied by the Java process with PID 9658.Further use of the command: Ps-aux | grep Java, or directly: Ps-aux | grep PID ViewYou can clearly know that the 8080 po
I. Open/Close firewall command under LinuxA: Permanent, no recovery after rebootOpen: Chkconfig iptables onOFF: Chkconfig iptables offB: Immediate effect, recovery after rebootOpen: Service iptables startClose: Service iptables stopWhen you open a firewall, you can use the following two methods for opening ports:1: Using commands1), you can see which ports are opened first NETSTAT-ANP2), turn off the port n
How IIS modifies the 80 port If you want to modify IIS without using the 80 method, it's easy to find in our IIS Manager, IIS management and then change 80 to 81. Apache modifies the listening port by: Open httpd.conf Modify Listen 80 for L Second World collation release Isten 81 Apache can monitor more than one port at a time to implement multiple HTTP services Just add a line like Listen 82 Similarly, IIS can modify the default port to avoid conflicts The modification method is similar
Win7 System Install VS and xampp after 80 ports conflict how to do? The following small series to share with you under the Win7 installation vs and xampp after 80 ports conflict processing techniques. The specific steps are as follows: 1, press Win+r key combination pop-up run the window, in the operation input: regedit, opens; 2, find the HKEY_LOCAL_MACHINE directory--system--find Currentc
I talked about how to get the available ports on the previous article. So the opposite question is, how do you get the list of ports you're using? The problem remains that there is no ready-made thing available, but it is no big deal for me. At least I think of a way to compare dirt, hey 1. We know that to view all current ports, you can use the Netstat tool, a
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