> > > > 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.
> 
> The TURN client's NAT filtering behavior??
No, the NAT which the TURN server is behind.

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