Re: Does SCTP support out of band data

From	ittium <ittium@gmail.com>
Newsgroups	comp.unix.programmer
Subject	Re: Does SCTP support out of band data
Date	2011-09-10 12:31 +0530
Organization	A noiseless patient Spider
Message-ID	<j4f1vf$4pl$1@dont-email.me> (permalink)
References	<j4c9lq$jd1$1@dont-email.me> <slrnj6k2oe.bjn.stephane.chazelas@spam.is.invalid>

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On 09-09-2011 PM 06:18, Stephane CHAZELAS wrote:
> 2011-09-09, 11:24(+05), ittium:
> [...]
>> Does SCTP support out of band data ?
> [...]
>
> An SCTP association can have several streams, so you can use
> one stream for "in-band" data, another for "out-of-band" data if
> you like.
>
> Message assembly and reordering in one stream doesn't affect
> other streams. Messages can also be sent with an "unordered"
> flag which can make their delivery faster in case of packet loss
> or out of order delivery on the network.
>
> So I suppose there's no point in having something similar as
> TCP's "URGENT" flag there.
>

thanks Stephane and Volker.

I am quoting this from RFC 4960

    "An SCTP endpoint can indicate that no ordered delivery is
    required for a particular DATA chunk transmitted within the stream by
    setting the U flag of the DATA chunk to 1.

    When an endpoint receives a DATA chunk with the U flag set to 1, it
    must bypass the ordering mechanism and immediately deliver the data
    to the upper layer (after reassembly if the user data is fragmented
    by the data sender).

    This provides an effective way of transmitting "out-of-band" data in
    a given stream.  Also, a stream can be used as an "unordered" stream
    by simply setting the U flag to 1 in all DATA chunks sent through
    that stream."

thanks
Ittium

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Does SCTP support out of band data ittium <ittium@gmail.com> - 2011-09-09 11:24 +0530
  Re: Does SCTP support out of band data Volker Birk <bumens@dingens.org> - 2011-09-09 10:40 +0000
  Re: Does SCTP support out of band data Stephane CHAZELAS <stephane_chazelas@yahoo.fr> - 2011-09-09 12:48 +0000
    Re: Does SCTP support out of band data ittium <ittium@gmail.com> - 2011-09-10 12:31 +0530

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