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----- Original Message -----
From: "Natalino Biundo"
<natalino.biundo AT marconi.com>
To:
<discussion AT sctp.de>
Sent: Thursday, April 11, 2002 1:01 AM
Subject: [SCTP-Discussion] Question about Ports negotiation with SCTP


> Hi all,
>
> First of all, I apologise for my question that may appear obvious to the
> SCTP experts.
>
> We are evaluating migration from TCP to SCTP in our embedded system based
> on a Client/Server architecture.
>
> Reading the RFC 2960 and several tutorials seems that, in order to
> establish an association between two endpoints, the SCTP port number of
> the Server must be known by the Client when initiates the association
and
> never changes.

A server uses a well known port number regardless of transport layer.

>
> On the contrary, TCP protocol requires a Server pre-defined port number
> only during the association phase and allows to negotiate the Server
> "working" port number to be used during the "stable connection" phase.

This has nothing to do with the Transport layer. What you are referring to
is a concurrent server where a server listens in on a well known port (e.g.
FTP has a well known port 21 specified in /etc/services). When a request
comes in, the server obtains an ephemeral port and forks a child (or use
threads) to handle the new connection, and continues to listen on its well
known port.

There is a proposed Socket API written by Randall Stewart et al that you may
find useful. This document is still a draft and can be obtained at
http://www.sctp.org/draft-ietf-tsvwg-sctpsocket-01.txt.

>
> The question is : Is something similar to the TCP behaviour possible
with
> SCTP ?

Yes, please see above.

>
> Many thanks in advance
>
> Natalino Biundo
> Marconi Mobile S.p.A

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• [SCTP-Discussion] Question about Ports negotiation with SCTP, Natalino Biundo, 04/11/2002
  • Re: [SCTP-Discussion] Question about Ports negotiation with SCTP, Brian F. G. Bidulock, 04/11/2002
  • Re: [SCTP-Discussion] Question about Ports negotiation with SCTP, S. Faizi, 04/11/2002
    • Re: [SCTP-Discussion] Question about Ports negotiation with SCTP, Andreas Jungmaier, 04/12/2002
  • <Possible follow-up(s)>
  • Re: [SCTP-Discussion] Question about Ports negotiation with SCTP, Srinivasa A. Shikaripura, 04/11/2002
    • Re: [SCTP-Discussion] Question about Ports negotiation with SCTP, Michael Tuexen, 04/11/2002

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