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Just forgot to reply to the list...

Begin forwarded message:

From: Michael Tüxen
<Michael.Tuexen AT micmac.franken.de>
Date: Sat May 3, 2003 22:09:30 Europe/Berlin
To:
hektor AT etri.re.kr
Subject: Re: [SCTP-Discussion] A few questions about shutdown..

Hi,

I have not tested this, but the procedure should be the following:
1. Retransmit the SHUTDOWN. If one of the retransmission go through
and the full SHUTDOWN procedure has worked, the upper layer sees
a shutdown complete notification.
2. If the number of retransmission hits the retransmission limits
you should see a communication lost notification.

So my guess is that you have found a bug in pre19. I will verify this.

Best regards
Michael

On Tuesday, Apr 29, 2003, at 11:06 Europe/Berlin, hektor AT etri.re.kr wrote:

G'day. list.

I have a few questions about shutdown procedures.

Let's assume A is tring to initiate shutdown procedures, and B is the peer of A,
and at that time,B has been dead.

If A gets time-out of shutdown timer after sending SHUTDOWN to B,
What is action of A?
  - Is the retransmission mechanism used? and subsequently detects failure of B?
    as a result of this, ULP got CommunicationLost Indication?
  - Or, irregardless of accepting SHUTDOWN Ack,
        Does A assume the shutdown procedure completed?
     
I've examined this using sctplib-1.0.0-pre19.
The result is that A never get CommunicationLost Indication.
Does It mean the stack implementations follow the second answer. or bugs?

Thanks in advance.

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• Fwd: [SCTP-Discussion] A few questions about shutdown.., Michael Tüxen, 05/03/2003

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