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Re: [P2PSIP] Choice of STUN peer or TURN peer

JiangXingFeng <jiang.x.f@huawei.com> Sat, 02 February 2008 03:34 UTC

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Date: Sat, 02 Feb 2008 11:35:15 +0800
From: JiangXingFeng <jiang.x.f@huawei.com>
In-reply-to: <2c7901c8654b$9aaf2020$c4f0200a@cisco.com>
To: 'Dan Wing' <dwing@cisco.com>, 'Bruce Lowekamp' <lowekamp@sipeerior.com>
Message-id: <002e01c8654c$a0451160$2d09a40a@china.huawei.com>
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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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> >
> > As Bruce suggested that message 1 and 4 will be routed
> > through the overlay.
> 
> I don't believe that will work; part of what causes TURN to
> be an effective NAT relay is that the TURN client sends
> a packet directly to the TURN server's publicly-routable
> transport address.  The side effect of the TURN client
> doing that is that the TURN client's (evil, nasty) NAT
> opens pinholes to communicate bi-directionally with the
> TURN server's transport address.

I agree with you. So I think we should also consider NAT's filtering
behavior while we choose a peer to be a TURN server. 

JiangXingFeng

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