[p2p-sip] NATs and P2P

[l4hurd at 163.com (Zhou Ya Jin)]

Actually in China, many internet user does not have public IP. As far as I am concerned, people in my office share a public IP. We use a router for NAT.
----- Original Message ----- 
From: "Effi Shiri" <effis at dsp.co.il>
To: <p2p-sip at cs.columbia.edu>
Sent: Tuesday, March 21, 2006 4:22 PM
Subject: Re: [p2p-sip] NATs and P2P


> 
> 
> This is very interesting
> Do you have statistics on how many Home users actually have Public IP?
> 
> 
> -----Original Message-----
> From: p2p-sip-bounces at cs.columbia.edu
> [mailto:p2p-sip-bounces at cs.columbia.edu] On Behalf Of Philip Matthews
> Sent: Tuesday, March 21, 2006 2:36 AM
> To: P2P-SIP
> Subject: [p2p-sip] NATs and P2P
> 
> [I guess all this traffic on the mailing list will teach me not to go  
> on vacation
> just before an IETF meeting!]
> 
> As I catch up on all the messages about NATs over the past two weeks,
> it seems to me that many people are thinking only of the "Public P2P  
> Service Provider"
> use-case as described in the use-cases document. In other words, a Skype
> competitor.
> 
> However, the use-cases document that David Bryan and his co-authors  
> wrote
> identified a number of other use-cases and it seems to me that these  
> have somewhat
> different NAT traversal requirements.
> 
> In particular, in some of these other use-cases, it seems to me that  
> we CANNOT assume
> there are peers with public IP addresses.
> 
> For example, consider the "Presence using Multimedia Consumer  
> Electronics Devices"
> use-case (section 3.1.3) -- essentially a P2P network of multimedia  
> consumer electronics devices
> that need presence information. Who is going to pay the extra money  
> to give their digital camera (or those
> neat 770 tablets that Nokia is demoing here in Dallas?) a public IPv4  
> address?? On the contrary,
> devices like this are almost certainly going to have private IP  
> addresses -- it is very common today for
> wireless internet providers to place a big NAT in front of their  
> entire network and give private addresses
> to all their customers.
> 
> Or consider the "IP PBX" use-case -- a IP PBX system for a company  
> with a number of small branches
> scattered throughout the world. Each branch is going to have a NAT in  
> front of its network, and all
> the phones in that branch are going to have private IP addresses.  
> None of the phones are going to
> have public IP addresses.
> 
> It is handling the NAT traversal issues for use-cases like these that  
> Eric Cooper and I wrote our
> internet-draft on NAT Traversal for P2P:
>       http://www.ietf.org/internet-drafts/draft-matthews-p2psip-nats- 
> and-overlays-00.txt
> 
> - Philip
> 
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