[sctp-dev] Strange closing of SCTP channel

[Chris Hegarty]

Jens,

Sorry, I haven't seen this strange type of behavior before. Is it 
possible for you to test the client with the SCTP implementation from 
JDK7 in case this is some strange issue with taking the implementation 
out of 7 and putting it in 6?

-Chris.

On 10/11/2011 14:02, Jens Carlberg wrote:
> Hi!
> I and a colleague are working with an application, working as SCTP
> server. We're seeing a strange behaviour we fail to understand, where
> the SCTP link closes on the server side when we are using a test client,
> without any reason we can perceive. When used with a "real" client, the
> link has no such problems. Also, the test client works well when used
> over the loopback interface.
> The sequence looks like this:
> * The server starts and accepts incoming connections.
> * The client starts and connects, getting a SCTP channel. We have dumped
> the network traffic and can see the complete startup sequence from INIT
> to COOKIE_ACK.
> * The client sends a request (a telecom protocol using SCTP as
> transport). The server sends a response. After this the link should stay
> open, waiting for further communication.
> * After a second or two, we can see in our application that SCTP
> delivers a notification, a AssociationChangeNotification with COMM_LOST.
> There is no packet corresponding to this in the network traffic dump we
> have looked at.
> * After about 30 seconds, the client sends a HEARTBEAT and gets an ABORT
> back.
> When using a "real" client or loopback interface, there is no
> notification delivered and the link stays up. We have gotten a network
> dump for the "real" client case, but not for the loopback interface.
> We are using...
> * Java 1.6.18 with the SCTP from Java 7.
> * Linux 2.6.32.12 with a hight refresh rate (1000 Hz instead of 250)
> * lksctp-tools-1.0.10-2.1 and lksctp-tools-devel-1.0.10-2.1
> Under what circumstances will a notification be generated? Can there be
> traffic we doesn't see, since we only look for traffic to/from the
> client? Can there be notification generated by other events?
> We include the two network dumps we have collected.
>
> ///Best regards,
>
> line
>
> *JENS CARLBERG **
> Software Designer*
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