network port

[Guest]

i am a newbie in networking...i often hear many time mention different network port..like fpt port etc.., ..to my understand different port means different route to different place and you can change the route...my question for you is how do i know which program using which port...let say which port is icq use or my tcp/ip use..what does change of the port mean..and you change the port under what situtation?..and how do you found that from window 2000 or window 98SE..would someone clear my confusion..thx

 

[NickM]

<A HREF="http://www.valinor.sorcery.net/glossary/Network-port.html" target="_new">Click here</A>

<A HREF="http://www.cyberwalker.net/connectors/network.shtml" target="_new">and here</A> ,
<A HREF="http://sdesign.com/cgi-bin/fwtest.cgi?APPLY=Scan+Me+Now" target="_new"> here </A> ,
<A HREF="http://https://grc.com/x/ne.dll?bh0bkyd2" target="_new"> here </A>

 

[jlanka]

Nickm's post #1 click was your answer. Just to add more, the IP address and port together make up what is called a socket. Basically the port is just an identification number that specifies which "service" you are interested in. A typical service could be ftp or telnet, etc. In the Unix world most machines don't run a process for every available service, there is just one process called inetd which receives all incoming connection request. inetd examines which port the incoming socket request is for, then starts up the appropriate service which is listed in a file called /etc/services. A similar thing happens in Windows, it's just more hidden from the user.

<i>It's always the one thing you never suspected.</i>