Re: BBC TV 4 - Hawkwind: Do not panic

Chris Ridd <chrisridd@xxxxxxx> wrote:

(Rowland McDonnell) said:

Jaimie Vandenbergh <jaimie@xxxxxxxxxxxxxxxxxxxxx> wrote:

Close enough, because that's all they are: an abstract addressing
system designed to get an incoming request to the correct application
to respond to it.

Well, yes, but how *exactly* is it all managed? You've explained some
of the missing info above - I'm getting it now.

Very simply - there's a list of "well known" ports that everyone
understands run particular services.

Umm. But that's how people look up which port to type in to their
program code. It doesn't explain how the OS and applications manage the
data transfer in practice, and that's what I'm trying to get my head
round.

This list is maintained by the
IANA, and you can go to <http://www.iana.org/assignments/port-numbers>
to see the current list.

Well, yeah, but that's not what I'm trying to get to understand.

Hmm. But if you (say) connected to that Telnet server and specified
port 80 when asking for the connection, it *would* work, wouldn't it?

It would *connect* at the TCP level, but as soon as one end tried
sending data to the other (ie assumed some protocol) it would probably
start failing.

How so? If you've got a computer with no Web server running on it
(i.e., not the normal server listening on socket 80), and you set up the
Telnet server to listen on socket 80, surely it should all `just work'
if you then tell your Telnet client to connect on socket 80?

Certainly that setup wouldn't work if you tried to connect your Telnet
client to the `standard' socket.

Here's a question: I spy a setting for `Universal plug and play'. ISTR
that this is one of those nasty security holes that should be turned
off. Am I right, or what?

Yes.

Done!

Rowland.

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