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I did a quick check on the rev 10 document. I couldn't find
anything disallowing the requirement that the client to use 2905 as
its source port. A possible interpretation could be that SCTP/M3UA
is a peer-to-peer relationship. It is a client-server relationship
only for establishing the relationship.

The TCP client-server model allows the client to use an ephemeral
port. The server always knows the ephemeral port number because it
arrives in a request for service. The server never strikes up a
conversation with its clients so it doesn't need to know the ports
of its clients prior to receiving a request for service.

In a peer-to-peer relationship, both sides are clients. Therefore,
both sides are better off knowing the "well-known" port for M3UA
service. Having the same well-known port makes that a trivial
exercise. Otherwise, one side would have the luxury of knowing 2905
while the other side would need exceptional procedures to get the
ephemeral port of the so-called client. In your case, the server
would have to record your ephemeral port and provide the value to
his M3UA code.

Mike

----- Original Message -----
From: "Chang Jin-woong"
<jwjang AT telcoware.com>
To:
<discussion AT sctp.de>
Sent: Monday, December 10, 2001 12:42 PM
Subject: [SCTP-Discussion] M3UA Port Number


: Hello all,
:
: May I ask a question on M3UA?
:
: Nowadays I have ongoing interoperability tests with beta version
of
: signalling gateway system from a company, with my sctplib-based
M3UA clients.
: During the test, the guys from the company told me that I should
use 2905
: for the dedicated local port number at client-side, as well as for
the remote port
: number at server-side.
: And they said, if not, their SG will not accept the connection.
: So I modified my program to use only 2905 as local port, and it
worked.
:
: But my common sense from TCP experience, there cannot be any
special
: reason to use the same port number for both servers and clients.
: According to the M3UA draft-10, it writes that
: "The SCTP and TCP Registered User Port Number Assignment
: for M3UA is 2905" (1.4.8 Client/Server Model).
:
: I think that it only means the "well-known" port number for M3UA
server is 2905.
: But does it also imply that M3UA client should also use 2905 as
its local port
: number?
:
: What is the exact meaning of "Registered User Port Number"?
:
: Thanks in advance,
: Chang Jin-woong
:
jwjang AT telcoware.com
:
:
:
: _______________________________________________
: discussion mailing list
:
discussion AT sctp.de
: http://www.sctp.de/mailman/listinfo/discussion

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• [SCTP-Discussion] M3UA Port Number, Chang Jin-woong, 12/10/2001
  • Re: [SCTP-Discussion] M3UA Port Number, Michael Tuexen, 12/10/2001
  • Re: [SCTP-Discussion] M3UA Port Number, Michael Mueller/bhu5nji, 12/10/2001

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