Re: SCTP Abort

Arvind,

If you have a firewall/router in between the boxes, or,
more likely, the box sending the SCTP ABORT is also
running a firewall, that could explain the SCTP ABORT
with the T-bit set.  The ABORT might be comming from the
firewall that allows the association to be established
but knocks down M3UA associations (PPI 3) from this
prohibited IP address/port on its first attempt to
transfer an M3UA message.

Could explain why other boxes work fine.

The one successful ASPUP can be explained by the speed
between the COOKIE_ACK and ASPUP in that exchanged
(a stateful firewall, or coordinated route pari, might
not have acheived state on the COOKIE_ACK before the
ASPUP arrived, allowing it to pass).

Nevertheless, check for SCTP-aware firewalls.

--brian

That would be one explanations


Arvind Kumar wrote:                          (Fri, 27 Feb 2009 09:29:48)
> 
>    Hello!
>    Thanks for your response.
>    If i am using some another machine, my SG with Softswitch is working
>    fine, adler32 works fine, but on this purticular machine even crc32
>    does not work.
>    I do not think it is issue at M3UA, like SG expecting reg req (I have
>    configured static registration both the side).
>    The problem is repeatable on this particular machine.
>    Thanks & Regards,
>    Arvind
> 
>    On 2/26/09, Brian F. G. Bidulock <[1][email protected]> wrote:
> 
>      Arvind,
>      Your log file shows both implementations using
>      Adler32 checksum.  The checksum was updated to
>      CRC32c some years ago, why is it using Adler32?
>      That is: a conforming SCTP configuration might
>      be a better place to start...
>      --brian
>      Arvind Kumar wrote:                          (Thu, 26 Feb 2009
>      14:09:46)
>      >
>      >    Hello Sigtran Gurus!
>      >    I am bringing Signaling Gateway Stack with Softswitch as
>      follows:
>      >               Signaling Gateway -------------          Softswitch
>      >               192.168.103.160
>      >    192.168.103.170
>      >        Association is established then goes down, softswitch
>      establishes
>      >    the association (four way handshake), it brings up the
>      association,
>      >    but suddenly Signaling Gateway is aborting the association by
>      sending
>      >    SCTP ABORT. This is happening again and again.
>      >    Surprising thing is that there is no reason in  ABORT msg.
>      >    Could you please give me any clue regarding this.
>      >    I have attached the log.
>      >    Thanks & Regards,
>      >    Arvind
>      > _______________________________________________
>      > Sigtran mailing list
>      > [2][email protected]
>      > [3]https://www.ietf.org/mailman/listinfo/sigtran
>      --
>      Brian F. G. Bidulock
>      [4][email protected]
>      [5]http://www.openss7.org/
> 
> References
> 
>    1. mailto:[email protected]
>    2. mailto:[email protected]
>    3. https://www.ietf.org/mailman/listinfo/sigtran
>    4. mailto:[email protected]
>    5. http://www.openss7.org/

-- 
Brian F. G. Bidulock
[email protected]
http://www.openss7.org/