Re: [Ekiga-devel-list] DCCP

[thomas schorpp <thomas schorpp googlemail com>]

yannick wrote:
> Le dimanche 08 juin 2008 à 22:37 +0200, Christian Hoene a écrit :
> > Hello,
> >
> > > "The Datagram Congestion Control Protocol (DCCP) is being designed as
> > >  a partial solution to this potential problem by adding end host TCP-
> > > friendly
> > > congestion control behavior to high-rate UDP streams such as streaming
> > > media."
> > A good reading to DCCP can be found at
> > http://www.sigcomm.org/sigcomm2006/discussion/showpaper.php?paper_id=3

ok, but presenting it 10x is a rather classic marketing practice.
and 2. presenting it in a "professors internist" language will lead me in emotional counter-reaction to second that first:

"...Problem Statement for [DCCP]", which discusses such questions as "why not just implement congestion control at the application layer?" and "why not SCTP?"

Snark? TheBonsai?

> > > -so only a partial solution of a becoming less "potential" problem due
> > > to advances
> > > with codecs which will slow down excessive UDP traffic.
> > Yes, both the codec and the DCCP must work hand-in-hand. If DCCP tells, that the link is congested, the codec must slow down its coding rate.

codecs could implement their own congestions detection protocols on their layer, etc.
but i tend to agree finally to leave this to a open standard like DCCP :)

> > > -most soho embedded routers and firewalls are based on very old linux
> > > kernels without DCCP-
> > > support and the DCCP wikipedia article states not much implementations
> > > since years.
> > The current solution for NATs is to use DCCP on top of UDP.
> > http://www3.tools.ietf.org/id/draft-phelan-dccp-natencap-00.txt

basically ISO/OSI- layer violation? see above.

> "In order for the [RFC4340] encapsulation to pass through Network
>    Address Translation (NAT) devices, these devices must be updated to
>    recognize and properly modify DCCP.  This is the long-term objective
>    for DCCP, and work is underway to specify the necessary operations."
>
> :(

yes, and as we all know, consumer hardware manufacturers will not provide firmware support for devices >2 years lifecycle age nowadays but you need to buy new for other tech upgrades anyway every 2-5 years, so no point, Yannick.

> > > since 2006 university playground, but patches for Ekiga are welcome ;)
> > Did the Internet started a university playground? IMHO researcher are nothing but kids that like to play ;-) 

with UTF-8 ? ;) pls send messages in ISO- encoding, thanks ;)

> > That's why I like to work at university...

o.O sorry for my bad english. good job for sure, thank You very much :)

> > Best,
> >
> >  Christian 

Best Regards,
Thomas