Re: [Sigtran] Abort chunk bundled with data chunk

["Salil Agrawal" <Salil.Agrawal at ccpu.com>]

Hi Ashwani, 

The question is not that whether DATA chunk should be bundled with the
ABORT or not. RFC is very clear about it that the sender should not do
in that way but here the question is if we at the receiver end receives
the same then what should be the action at the receiver end (should we
send the SACK for the DATA or not).

Thanks,
Salil

-----Original Message-----
From: Ashwani Kathuria [mailto:ashwani.grps at gmail.com] 
Sent: Thursday, October 15, 2009 2:11 PM
To: Salil Agrawal
Cc: sigtran at ietf.org
Subject: Re: [Sigtran] Abort chunk bundled with data chunk

Placing DATA chunk before control chunk (ABORT) makes it an Invalid SCTP
packet.

--Ashwani Kathuria

On Thu, Oct 15, 2009 at 1:46 PM, Salil Agrawal <Salil.Agrawal at ccpu.com>
wrote:
> Thanks Ashwani,
>
> I understand that it does not make any sense to send the SACK, and
abort
> chunk should be the placed before the DATA chunk. But the question is
if
> the ABORT chunk is placed after the DATA chunk in the received packet
> then should be send the SACK for the DATA or not.
>
> Thanks,
> Salil
>
>
> -----Original Message-----
> From: Ashwani Kathuria [mailto:ashwani.grps at gmail.com]
> Sent: Thursday, October 15, 2009 12:58 PM
> To: Salil Agrawal
> Cc: sigtran at ietf.org
> Subject: Re: [Sigtran] Abort chunk bundled with data chunk
>
> Hi Salil,
>
> When you are bundling anything (control chunk) with DATA chunk it
> should be placed before DATA chunks in the SCTP packets.
> Now if you bundle the ABORT chunk with DATA chunk in a single SCTP
> packet the ABORT chunk will be processed before DATA chunk and
> association will be broken down.
> So, that DATA chunk will have no significance as it's association is
> now broken by the ABORT chunk placed before it.
>
> --Ashwani Kathuria
>
> On Thu, Oct 15, 2009 at 12:37 PM, Salil Agrawal
<Salil.Agrawal at ccpu.com>
> wrote:
>> Hi,
>>
>> We have a confusion while understanding the SCTP RFC4960 section 9.1
> it
>> says "DATA chunks MUST NOT be bundled with ABORT" so sender must not
>> bundle the data with abort.
>>
>> But the second paragraph states that "An endpoint MUST NOT respond to
>> any received packet that contains an ABORT chunk". Which means if any
>> packet is received at the receiver end where ABORT is bundled with
the
>> DATA it should not send any response. Does it mean that for the DATA
>> chunk SACK should not be generated? Please clarify.
>>
>> Thanks,
>> Salil Agrawal
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>>
>