1。 After running PortMap, click the Add button. 2. In the pop-up Add/Modify Port Mapping window, select any.
IP ",add the IP of the whole network segment used by the client.
3. Then enter the mapping port in the "Input Port" column (in vagaa settings), and "Output IP" is the public IP of your own Internet proxy server, and then enter the port number in the output port (the input port is the same as the output port).
How to use the port?
Purpose of the port: The port is the outlet for the equipment to communicate with the outside world.
Ports can be divided into virtual ports and physical ports.
Virtual port refers to the port inside the computer or the switch router, which is invisible.
Physical ports, also known as interfaces, are visible ports, RJ45 network ports on the computer backplane and RJ45 ports, such as switch router hubs. Phones using RJ 1 1 jack also belong to the category of physical ports.
The role of the port:
The role in the invasion
Someone once compared the server to a house and the port to a door leading to different rooms (services), which is a good metaphor if details are not considered. If an intruder wants to occupy the house, he will definitely break into the house (physical invasion is another word), so it is very important for the intruder to know how many doors the house has opened, what kind of doors it is and what is behind them.
Intruders usually use scanners to scan the ports of the target host to determine which ports are open. From the open port, intruders can know what services the target host provides, and then guess the possible vulnerabilities. Therefore, scanning ports can help us better understand the target host. For administrators, scanning the open ports of this machine is also the first step to do a good job of security prevention.
How to open the port 139 on the windowsserver2003 command line?
The way to open the 139 port is to select the Internet Protocol (TCP/IP) attribute in the local connection in the network and dial-up connection, and enter the advanced TCP/IP settings and WINS settings. There is an item "NETBIOS with TCP/IP enabled", and check to open the 139 port.
How to open the port of this machine?
Usually, the communication of these ports clearly indicates the protocol of a certain service.
For example, port 80 has always been HTTP communication. (2) Registration port: from 1024 to 49 15 1. They are loosely bound to some services. In other words, many services are bound to these ports, and these ports are also used for many other purposes. For example, many systems handle a dynamic port of about 1024. (3) Dynamic and/or proprietary ports: from 49 152 to 65535. Theoretically, these ports should not be assigned to services. In fact, machines usually allocate dynamic ports from 1024. But there are exceptions: SUN's RPC port starts at 32768. In the process of surfing the Internet, our computers will inevitably be invaded by Trojans. General Trojan antivirus software can be found out, but newer or rare ones may be missed, because ordinary Trojans will open a port on the computer and wait for others to control it. Therefore, the port is usually analyzed to see if there is an abnormal program. The netstat command provided by windows can only list open ports. So if you want to see which program occupies the port, sometimes you have to turn to third-party software, such as ActivePort or Fport, but these softwares need to be installed before they can be used, which is more troublesome. In fact, under XP and Windows2003, netstat has added a -b switch to specify the programs corresponding to the ports listed at the same time. This is very useful for us to analyze whether there are Trojan horses or abnormal programs. Just enter netstat-anb to realize the functions of fport or ActivePort. Try it now:) How to check the usage of the port number on the local computer?
viewport
To view the ports in Windows2000/XP/Server2003, you can use the Netstat command:
Click "Start → Run" in turn, enter "cmd" and press enter to open the command prompt window. Type "netstat-a-n" at the command prompt, and then press Enter to view the port number and status of TCP and UDP connections displayed in digital form.
Netstat command usage
Command format: netstat-a-e-n-o-s-an.
-a shows all active TCP connections and TCP and UDP ports that the computer listens to.
-e indicates the number of bytes and packets sent and received by Ethernet.
-n indicates that only the addresses and port numbers of all active TCP connections are displayed in digital form.
-o displays the active TCP connections, including the process ID(PID) of each connection.
-s indicates that statistics of various connections, including port numbers, are displayed by protocol.
-View all open ports
How to check the usage of ports on this computer? ?
To view the port in Windows2000/XP/Server2003, you can use the Netstat command: click Start → Run, type "cmd" and press enter to open the command prompt window. Type "netstat-a-n" at the command prompt, and then press Enter to view the port number and status of TCP and UDP connections displayed in digital form. Netstat command usage command format: netstat-a-e-n-o-s-an-a displays all active TCP connections and TCP and UDP ports that the computer listens to. -e indicates the number of bytes and packets sent and received by Ethernet. -n indicates that only the addresses and port numbers of all active TCP connections are displayed in digital form. -o displays the active TCP connections, including the process ID(PID) of each connection. -s indicates that statistics of various connections, including port numbers, are displayed by protocol. -View all open ports