RE: [Sipping] P2P why not DNS for discovery?

["Brian Rosen" <br at brianrosen.net>]

I'm not sure I buy this argument.
DNS is sufficiently distributed that I wouldn't consider it centralized, and
its real life situation is that it is highly reliable and highly available,
and of course, essentially free (you're paying for DNS service somewhere,
but it's usually built into your access bill). 

If the solution relied in dynamic DNS, then we have a little less of the
"highly reliable" and "highly available" and "free".  You can get one of
those for sure, and two out of three often, but usually not all three.
Nevertheless I suspect even dynamic DNS is good enough.

I'm not much of a purist.  I think Juha's ideas might work and merit more
thought.

Brian



> -----Original Message-----
> From: sipping-bounces at ietf.org [mailto:sipping-bounces at ietf.org] On Behalf
> Of Brijesh Kumar
> Sent: Thursday, February 03, 2005 9:10 AM
> To: Juha Heinanen
> Cc: sipping at ietf.org
> Subject: Re: [Sipping] P2P why not DNS for discovery?
> 
> Juha:
> 
> ----- Original Message -----
> From: Juha Heinanen <jh at tutpro.com>
> Date: Wednesday, February 2, 2005 9:21 pm
> Subject: [Sipping] P2P why not DNS for discovery?
> 
> > there must be some ery good reasons for inventing all those new p2p
> > protocols we have read on this mailing list, but i would still
> > like to
> > hear why an existing protocol, namely DNS, is not good for discovery?
> 
> DNS is good for discovery, but is it P2P?
> 
> P2P applications need to  run without relying on centralized servers in
> networking
> infrastructure. So, clearly the use of centralized DNS to resolve does't
> fullfill
> that requirement. Actually, there is a project called Distributed DNS
> which is
> a P2P version of DNS based on DHT. While P2P based DNS is useful idea, it
> is
> is n't designed or meant to replace sip registrar function. The efficiency
> of
> DHT based search, makes P2P sip a good proposition to explore.
> 
> > my sip uri is sip:jh at tutpro.com.  if someone wants to get my contact
> > information, they could simply make a sip srv query on jh.tutpro.com,
> > which my sip ua is keeping up to date via dynamic dns updates either
> > directly or indirectly using xmlrpc, for example.
> >
> > what is wrong with this kind of DNS approach?
> 
> Nothing wrong. But, this clearly is not P2P approach being
> pursued in P2P SIP.
> 
> cheers,
> 
> --bk
> 
> >
> > -- juha
> >
> > _______________________________________________
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> >
> 
> 
> _______________________________________________
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> 




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