You generally do not specifiy the source port on your machine. TCP/IP or the
apllication decides. When you connect to port 80 on the webserver it sees
your IP Address and the source port you came in on to communicate back to
your IP Address and that port. That is why you can opn many instances of
your web browser and go to different websites. Each instance is going to use
a different source port to connect to the webserver and each webserver is
going to use the source port you browser app picked to communicate back to
that browser.
I hope that helped and di not confuse it more.
----- Original Message -----
From: "RAUNIYAR RAJEEV" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, September 29, 2000 4:04 PM
Subject: Could someone help me !
>
> Hi all,
>
> now i DO have a question. i'm reading up about ports used by TCP/UDP
> protocols but im having trouble visualizing where the source port and
> destination ports fit in. im thinking that the destination port (suppose
> on a www, http segment) of 80, would be on the server from which we will
> download the data right? and we would specify a port (called source
> port) to which we want the data to come into our machine right?
> but then how would the www server distinguish between many sessions if
> their port is always port 80??
>
> another example... suppose a college closes a "napster" port... can't you
> just log onto the napster server using a different port from your
> college? hmm.. i really confused.
>
> could you somehow help me visualize where these ports are in the
> network. and who sets them and how destination servers and clients differ
> etc..
>
> thanks,
>
>
>
>
>
>
>
>
>
>
>
>
> **NOTE: New CCNA/CCDA List has been formed. For more information go to
> http://www.groupstudy.com/list/Associates.html
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