I guess it assumes that if you're using some kind of daemon/service that's
listening to that port prior to any outbound session, then the port will
never be used unless the daemon is shutdown.... other than that, I have no
clue :-(
Kenneth Lorenzo
"Chuck Larrieu" <[EMAIL PROTECTED]> wrote in message
001501c04859$73102120$[EMAIL PROTECTED]">news:001501c04859$73102120$[EMAIL PROTECTED]...
> Got a question about this.
>
> Application wants to open a TCP connection to something - say http, so the
> application issues the request, TCP on the application side uses some
random
> port number above 1023 as the source port number. The destination port is
> the well know port on the distant end.
>
> However, I see from the IANA port listings
> (http://www.isi.edu/in-notes/iana/assignments/port-numbers ) that there
are
> any number of registered ports above 1023. For example L2TP uses port
1701,
> Groupwise uses port 1677, ands WINS uses port 1512. The IANA page itself
> calls ports 1024 through 49151 "registered" and further states that only
> ports 49152 and beyond are "dynamic and / or private"
>
> Anyone ever sniffed outbound traffic and seen apps using source ports in
the
> 1024 through 49151 range?
>
> It just occurs to me that this has the potential of creating problems, if
an
> application uses a port reserved for some other application. Since most of
> the ports in this "registered" range appear to be for obscure kinds of
> services or applications, perhaps this isn't really and issue.
>
> Comments?
>
> Chuck
>
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