[gfodor]

Yup that's a great point. I'd love to see this approach explored further. Is there any risk of tuple collisions in some bizarro NAT situation? I'd guess not, since the remote tuple needs to route to a single destination, but there's some weird stuff out there... eg one could imagine a router abusing the IP protocol to somehow route packets to different destinations despite them having the same return IP/port combo. i'm no networking wizard, but in general i assume if its possible, someone is doing it :)