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An operating system can simultaneously receive hundreds, thousands or even tens of thousands of TCP (Transmission Control Protocol) per second, and must quickly establish connections which he still belongs to each package inante to do anything else.
Ports are necessary to enable the operating system to distinguish connections between them. Thus a TCP connection is defined by four parameters that make up a unique combination:
Source IP: source port <-> destination IP: port destination
or short
SrcIP: srcPORT <-> dstIP: dstPORT
where is the source address and destination where the connection is initiated to address that initiated the connection, these addresses are defined as the source port and destination port.
You can not have two different connections with the same four parameters, so the operating system knows when he receives a package that belongs connections.
An application server must wait for connections and customers can apply serverasca operating system to be assigned a specific port, depending on the type of service provided so that when customers make connection requests on that port the operating system to transmit the application request concerned and if you are accepted connections, to do what is necessary. So any port is opened by an application that expects demand from customers.
Conventional correspondence was established between port number and type of service offered so if you want to access a particular service on an IP address to be easy to port location is necarara transmission connection request.
Keep in mind also that this correspondence is such that although only conventional WWW service (HTTP) is usually associated with port 80 nobody can stop me to relate to port 7891 for example, the only restriction is that on a certain port can listen to one program at a time.
To learn how to change the listening port on a specific application, consult a manual application in question, some support it through other configuration file by command line others do not support it.
After reading the above lines, you may think that changing ports get extra security. Well, drop the idea, using non-standard ports may be The user but provides no additional security. Generally, a determined attacker will use a program that will try to connect the line to any of the 65,535 available ports until you get a complete list of listening ports on your server services
Ports are necessary to enable the operating system to distinguish connections between them. Thus a TCP connection is defined by four parameters that make up a unique combination:
Source IP: source port <-> destination IP: port destination
or short
SrcIP: srcPORT <-> dstIP: dstPORT
where is the source address and destination where the connection is initiated to address that initiated the connection, these addresses are defined as the source port and destination port.
You can not have two different connections with the same four parameters, so the operating system knows when he receives a package that belongs connections.
An application server must wait for connections and customers can apply serverasca operating system to be assigned a specific port, depending on the type of service provided so that when customers make connection requests on that port the operating system to transmit the application request concerned and if you are accepted connections, to do what is necessary. So any port is opened by an application that expects demand from customers.
Conventional correspondence was established between port number and type of service offered so if you want to access a particular service on an IP address to be easy to port location is necarara transmission connection request.
Keep in mind also that this correspondence is such that although only conventional WWW service (HTTP) is usually associated with port 80 nobody can stop me to relate to port 7891 for example, the only restriction is that on a certain port can listen to one program at a time.
To learn how to change the listening port on a specific application, consult a manual application in question, some support it through other configuration file by command line others do not support it.
After reading the above lines, you may think that changing ports get extra security. Well, drop the idea, using non-standard ports may be The user but provides no additional security. Generally, a determined attacker will use a program that will try to connect the line to any of the 65,535 available ports until you get a complete list of listening ports on your server services
