Re: [P2PSIP] Choice of STUN peer or TURN peer
"Dan Wing" <dwing@cisco.com> Sat, 02 February 2008 08:30 UTC
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From: Dan Wing <dwing@cisco.com>
To: 'Francois Audet' <audet@nortel.com>, 'Cullen Jennings' <fluffy@cisco.com>, 'Bruce Lowekamp' <lowekamp@sipeerior.com>
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Date: Sat, 02 Feb 2008 00:32:03 -0800
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Cc: 'P2PSIP Mailing List' <p2psip@ietf.org>
Subject: Re: [P2PSIP] Choice of STUN peer or TURN peer
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> -----Original Message----- > From: p2psip-bounces@ietf.org > [mailto:p2psip-bounces@ietf.org] On Behalf Of Francois Audet > Sent: Friday, February 01, 2008 4:14 PM > To: Cullen Jennings; Bruce Lowekamp > Cc: P2PSIP Mailing List > Subject: Re: [P2PSIP] Choice of STUN peer or TURN peer > > I'm sure this is an incredibly dumb question: but why does a > peer need to > think of being a TURN server (by presumably "testing" if it > is behind a NAT)? > > Wouldn't it work if all peer always try to be TURN/STUN servers? > A peer would advertize a TURN server for the any public IP addresses > it has. That includes both local public IP addresses as well as > self-discovered IP addresses (gathered through STUN using > other peers). > > If it happens that the peer is behind a NAT that does not have an > endpoint independent mapping, then it just won't receive any > TURN/STUN packets. > > The algorithm could work something like this, upon connecting > to the network: > > - If local IP address is public then advertize it (both STUN and TURN) > - Then, when another peer STUN server is discovered, discover > if you have another public IP address > binding (that would occur for example if you have NATing of > public IP addresses) > - Then advertize new IP address (both for STUN and TURN > server) on discovered IP address and port > - And so on > > You just won't get any incoming STUN/TURN destined to your > local IP:port if you are NATed (public to > public). Similarly, you won't get any incoming STUN/TURN > destined to your discovered IP:port if the > NAT is not endpoint-independent. Reports indicate that roughly 25% of NATs would block such incoming packets. This means that a TURN client, trying to use a random TURN server's transport address that is published into the p2p overlay, would get a 75% success rate. If the TURN client tried two TURN servers it would get a success rate of 87.5%, and so on, up to trying 11 TURN servers to get a success rate of 99.9%. Those success rates include no calculations about TURN servers that have crashed, had their p2p-TURN application terminated, had their NATs crash or otherwise lose state, etc. -d > > -----Original Message----- > > From: p2psip-bounces@ietf.org > > [mailto:p2psip-bounces@ietf.org] On Behalf Of Cullen Jennings > > Sent: Thursday, January 31, 2008 20:44 > > To: Bruce Lowekamp > > Cc: P2PSIP Mailing List > > Subject: Re: [P2PSIP] Choice of STUN peer or TURN peer > > > > > > On Jan 28, 2008, at 8:01 AM, Bruce Lowekamp wrote: > > > > > But otherwise, the TURN > > > protocol seems to work as is. For the purposes of a TURN > server, a > > > NAT having endpoint independent mapping seems to be the only real > > > requirement on the NAT > > > > Agree on that but ... > > I think the hard part we have not fully solved yet is how a > > peer that is thinking of being a TURN server is going to > > detect if this is the case or not. > > _______________________________________________ > > P2PSIP mailing list > > P2PSIP@ietf.org > > http://www.ietf.org/mailman/listinfo/p2psip > > > _______________________________________________ > P2PSIP mailing list > P2PSIP@ietf.org > http://www.ietf.org/mailman/listinfo/p2psip _______________________________________________ P2PSIP mailing list P2PSIP@ietf.org http://www.ietf.org/mailman/listinfo/p2psip
- RE: [P2PSIP] Choice of STUN peer or TURN peer JiangXingFeng
- RE: [P2PSIP] Choice of STUN peer or TURN peer Dan Wing
- RE: [P2PSIP] Choice of STUN peer or TURN peer JiangXingFeng
- Re: [P2PSIP] Choice of STUN peer or TURN peer Bruce Lowekamp
- [P2PSIP] Choice of STUN peer or TURN peer JiangXingFeng
- RE: [P2PSIP] Choice of STUN peer or TURN peer Dan Wing
- RE: [P2PSIP] Choice of STUN peer or TURN peer JiangXingFeng
- RE: [P2PSIP] Choice of STUN peer or TURN peer Dan Wing
- RE: [P2PSIP] Choice of STUN peer or TURN peer JiangXingFeng
- Re: [P2PSIP] Choice of STUN peer or TURN peer Bruce Lowekamp
- RE: [P2PSIP] Choice of STUN peer or TURN peer JiangXingFeng
- RE: [P2PSIP] Choice of STUN peer or TURN peer Dan Wing
- RE: [P2PSIP] Choice of STUN peer or TURN peer Henry Sinnreich
- RE: [P2PSIP] Choice of STUN peer or TURN peer Jerry Yin
- RE: [P2PSIP] Choice of STUN peer or TURN peer Dan Wing
- RE: [P2PSIP] Choice of STUN peer or TURN peer JiangXingFeng
- RE: [P2PSIP] Choice of STUN peer or TURN peer JiangXingFeng
- RE: [P2PSIP] Choice of STUN peer or TURN peer Dan Wing
- RE: [P2PSIP] Choice of STUN peer or TURN peer Dan Wing
- Re: [P2PSIP] Choice of STUN peer or TURN peer Cullen Jennings
- Re: [P2PSIP] Choice of STUN peer or TURN peer Henry Sinnreich
- Re: [P2PSIP] Choice of STUN peer or TURN peer Song Yongchao
- Re: [P2PSIP] Choice of STUN peer or TURN peer JiangXingFeng
- Re: [P2PSIP] Choice of STUN peer or TURN peer Dan Wing
- Re: [P2PSIP] Choice of STUN peer or TURN peer JiangXingFeng
- Re: [P2PSIP] Choice of STUN peer or TURN peer Dan Wing
- Re: [P2PSIP] Choice of STUN peer or TURN peer JiangXingFeng
- Re: [P2PSIP] Choice of STUN peer or TURN peer Dan Wing
- Re: [P2PSIP] Choice of STUN peer or TURN peer Dan Wing
- Re: [P2PSIP] Choice of STUN peer or TURN peer Cullen Jennings
- Re: [P2PSIP] Choice of STUN peer or TURN peer Dan Wing
- Re: [P2PSIP] Choice of STUN peer or TURN peer JiangXingFeng
- Re: [P2PSIP] Choice of STUN peer or TURN peer Bruce Lowekamp
- Re: [P2PSIP] Choice of STUN peer or TURN peer Francois Audet