Re: TCP packets : end of thre-way handshake and start of data-transmission- how to detect ?

Hello Paul,

Is there a specific reason why you insist on implementing
TCP/IP with such small resources ?

I'm an hobbyist. They do normally not need something like a reason to try to
do something, do they ? :-)

But if you want to know, I've seen several projects implementing the same,
and thought it would be a nice project to try for myself.

Examples:
http://archive.chipcenter.com/circuitcellar/july99/c79bl1.htm
http://members.home.nl/bzijlstra/software/examples/RTL8019as.htm

UDP would be much more suitable for such small devices.

ARP, ICMP (together PING), IP and UDP are allready there. TCP is just the
next to be implemented.

Regards,
Rudy Wieser


-- Origional message
Paul Keinanen <keinanen@xxxxxx> schreef in berichtnieuws
fdnvv490sb6a2uvhc1fc7rm1gptcdggrjo@xxxxxxxxxx
On Mon, 4 May 2009 22:06:34 +0200, "R.Wieser" <address@xxxxxxxxxxxxx>
wrote:

Hello Tauno,

There is no danger of a mix-up: a TCP connection is
identified by a set of four numbers: the source IP,
destination IP, source port and destination port.

Hmmm ... thats 12 (IPv4) or 16 (IPv6) bytes only to define a two-way
socket.
As I'm working on a controller with very limited memory (just 2048
*Bytes*
of RAM, which allso needs to hold the ethernet-packet itself as well as
the
stack) I hoped I could use another method to uniquely identify a
connection
: by (ab)using (a few bits of) the new-to-be-assigned portnumber together
with the Acknowledge-number. But alas, that idea is now outof the
window.

Is there a specific reason why you insist on implementing TCP/IP with
such small resources ?

UDP would be much more suitable for such small devices.

Paul



.

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