Re: [rtcweb] realiable data service

Forgive the top-posting, but I want to make a meta-comment.  If we were
planning on building something from scratch, I would strongly agree that it
would be quite tough going, especially given our timelines.  But this
working group is not allowed to re-use existing work, it is strongly
encouraged to do so.  Picking a protocol to implement which has the
characteristics below is a lot less difficult than re-starting the exercise
from scratch.

Providing XMPP, DTLS, or SCTP between the endpoints certainly has
challenges, but it would *not* involve starting from scratch.

regards,

Ted

On Mon, Jul 18, 2011 at 6:56 AM, Magnus Westerlund <
magnus.westerlund@ericsson.com> wrote:

> On 2011-07-15 19:29, Tim Panton wrote:
> > I don't think it is very hard to implement, we could take RFC 5456's
> > sequencing and retry mechanism for example. or indeed Plan9's IL .
>
> I would warn about thinking this is easy. It is easy to get something
> that works on sunny days, it is hard to build something that is secure,
> efficient, robust and fair.
>
> I would like to point out that a reliable protocol do need a number of
> functions. If those are achieve from a lower layer or need to be
> implemented in this protocol is a choice. However, functionalities such as:
>
> - Congestion Control
> - Flow Control
> - Retransmission
> - RTT estimation
> - Buffer handling
> - Parameter and functionality negotiation
>
> Are likely all need for a safe and stable and future safe protocol.
>
> There are good reasons for choosing something there is experience in
> that it works.
>
> For example I took a quick look at RFC5456 which appears to not have
> congestion control. I think it is partly relying on that the transported
> flow will adopt them self if trunking, or if not, that they become
> useless and the call terminates because of that.
>
> cheers
>
> Magnus Westerlund
>
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