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Hi,
see my comments below.
Best regards
Michael

Michael Tuexen Tel.: +49 89 722 47210
Siemens AG Fax: +49 89 722 48212
ICN WN CC SE 7 e-mail:
Michael.Tuexen AT siemens.com

> -----Original Message-----
> From: Oon Heok Kee
> [mailto:oonheokkee78 AT hotmail.com]
> Sent: Thursday, October 17, 2002 4:32 PM
> To:
> discussion AT sctp.de
> Subject: [SCTP-Discussion] UDP-style socket queries
>
>
> Hi,
>
> As written in the draft, a UDP-style SCTP socket doesn't
> really work like
> UDP because it's connection-oriented, but I think the line is
> a bit blur
> here. I created a UDP-style socket on a server machine and
> after the other
> necessary steps like bind() and so on, I continuosly pass
> some data to the
> sendto() function to send to a client machine.
>
The client should first call send, because the client should
start (implicitly) the association setup. Keep in mind that
the server has to call listen on the server socket to allow
accepting associations.
> From the screen, I see that sendto() is continuosly called
> with no error
> messages appearing. If I'm to give the server a client IP to
> send data to,
> will it just start sending once sendto() is called (even when
> the client is
> down), or it needs the client to be running and the 2
> machines perform the
> 4-way setup before any data can be transferred?
>
UDP like API means 'implicit association setup'. So the client
will first call sendto() and therefore the SCTP implementaion
will establish an association (4 way hand shake) and after that
it will transfer the data. If the server is not running you will
see only INITs on the wire, maybe an ABORT in response to that.
> Secondly, since only TCP-style socket support SO_SNDBUF, can you
> recommend an alternative method to obtain the same effect of
> using SO_SNDBUF
> with an UDP-style socket?
I'm not sure what behaviour you want from the socket. Could you explain
that a bit?
>
> Thank you!!
>
>
>
> Oon, Heok Kee
>
>
>
>
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• [SCTP-Discussion] UDP-style socket queries, Oon Heok Kee, 10/17/2002
  • <Possible follow-up(s)>
  • RE: [SCTP-Discussion] UDP-style socket queries, Tuexen Michael, 10/17/2002

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