@abhinavrakesh : Sir there is a whole lotta difference between opening port and open port! I finally understand 1 pt u were tryin to make and that was abt COM port!
I was only on dialup till previous year!
The opening port u mentioned is about COM port, otherwise open ports like telnet,ftp etc dont show u any sign of messege saying opening port. I used hyperterminal a long time ago coz now my sole OS is *nix ! I use netcat etc in ma daily life with ma own indegenously built network tools on *nix, coz i like to use my own created tools rather than OS provided. Ok type "netstat -t -u"...these all are open ports and tell me if u find any, imean any hardware port there!
As i mentioned COM port is the dos name for serial port....so this port naturally is a hardware port and comes from behind ur PC cabinet! It says opening port bcoz it first checks the connection with this hardware port.
Now, u cant telnet from software port to a hardware port.....Can u? this wud change the whole concept of process to process communication. And why cant i telnet to my system, if my friend can? Thats a new one,absurd and totally obscure!
U cant telnet to com port ,got it? but the LPD(515) printer port,IPP port (631) etc. [*www.chebucto.ns.ca/~rakerman/port-table.html]
Now u said..."first open telnet and then search with portscan"...etc.......Now ma friend to make more clear when u urself open telnet service and do a little portscan u'll ofcors find telnet port (23) open isnt it?
Next, u said "you did'nt find any open ports because your computer doesn't count hardware ports as open ports as these ports are used by OS's for functioning but another computer can search for hardware open ports and can use that port to telnet into any computer the bandwidth depends on what type of port is it and what hardware is connected to it modem is the most common out of all that directly dials any number "!
MY GOD, what r u saying bro.....this wud demolish the whole security system if OS is made like that and lead thefts! U just created a new concept.
Please i dont mean to be rude....but please google abt open ports for god sake!
But ..... modem generated nos.... am i missing a step here as said by @pradeep_chauhan!
@abhinavrakesh, Please explain what de heck these nos. are?
CHEERS!