Re: [Sigtran] Abort chunk bundled with data chunk

[Ashwani Kathuria <ashwani.grps at gmail.com>]

No, SACK should not be sent in such case.

On Thu, Oct 15, 2009 at 2:28 PM, Salil Agrawal <Salil.Agrawal at ccpu.com> wrote:
> 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
>>> _______________________________________________
>>> Sigtran mailing list
>>> Sigtran at ietf.org
>>> https://www.ietf.org/mailman/listinfo/sigtran
>>>
>>
>