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Dear Chang,

you re right in principle. But if you want to make use of the INIT collision
stuff (which means both are client and server) the port numbers must be
known by both peers. But if you have a 'pure' client-server setup (which
is the model preferred by m3ua) only the server uses the well known port.

So it seams to be a 'feature' of the SG.

Best regards
Michael
On Monday, December 10, 2001, at 06:42 PM, Chang Jin-woong wrote:

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



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Michael.Tuexen AT micmac.franken.de

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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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