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[SCTP-Discussion] Re: SCTP Partial reliability?


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  • From: Raja Muhammad Hammad <rajahammad AT gmail.com>
  • To: discussion AT sctp.de
  • Subject: [SCTP-Discussion] Re: SCTP Partial reliability?
  • Date: Fri Mar 25 17:52:03 2005
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  • List-id: SCTP Discussions <discussion.sctp.de>
Can somebody please help me here?


On Thu, 24 Mar 2005 04:10:22 +0500, Raja Muhammad Hammad
<rajahammad AT gmail.com>
wrote:
> hi
> I am confused as how to use partial reliability (PR) in my application.
> Does the parameter in sctp_sendmsg() "timetolive" provide PR semantics
> or there is something else required to exploit PR.
> As stated out in SCTP socket API draft, lifetime parameter in RFC 2960
> is different from the timed-reliability service in a way that if
> "if SCTP has sent the first transmission before the lifetime expires,
> then the message MUST be sent as a normal reliable message." which
> means retransmissions of the message even if lifetime expires until
> its ACK is received.
>
> "When the "timed reliability" service is invoked, this latter
> restriction is removed." By later it definitely means retransmisions
> here.
>
> Now in sctp_sendmsg() I guess "timetolive" corresponds to "lifetime"
> parameter which means it does not provide PR semantics?.
>
> I hope somebody could clear this out as what exactly is PR and how to
> use it in an application using sctp library. It would be really
> helpful to give an
> example here.
>
> Regards
> Hammad
>


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