Well I have a fairly strong background in the entire OSI model - more
specifically the layers you mention.
A 1.5MB will definitely result in a larger download, but the actual size
will depend on many things.

Most importantly - how it's being downloaded. (FTP/HTTP) etc.  But to us
(the application layer) we don't see those bytes, so some preloader etc
would only see 1.5MB - and hence that information would be correct.

I'm trying to figure out what is the motivation behind the question, it's
actually very simple - not complex. (or at least - what is it you are
asking).

There are plenty of books, look at any Cisco Internetworking book and/or any
networking book that covers metrics.
If you are looking to pollute your mind with even more details, then please
do not forget the fact that your NIC controller is going to have some
collisions from time to time and depending on the size of the TCP window at
that point, that information too will be lost.

I'll be more than happy to answer any specific question if you like.
Thanks - Fruber


-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Martin
Klasson
Sent: Wednesday, November 02, 2005 1:32 AM
To: Flashcoders mailing list
Subject: [Flashcoders] packets and downloads


Hi People.

Some basic underlying facts should be needed about the I/P-protocol.

When a file, as swf is for example 1.5 megabytes, is it really 1.5 that is
downloaded. Or is it more really, since every packet, according to standard
is 576, and 40 of them is the header. 

This would cause a thing so that you rethink some loading aspects in flash,
as well as bandwidth-checking and streaming-loaders perhaps.

Do you have found any great articles which take this into details? It should
be very fun to get more-in-depth knowledge about this basic but yet VERY
complex.

/ martin
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