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Seems good. But there is a problem here.

I use lua in a game engine where external C libraries are not allowed  :(
I should have been clearer.

So  is there a pure Lua solution for the above? 

On Fri, Feb 24, 2012 at 8:57 AM, Eric Wing <> wrote:
I think you want to look at NAT-PMP (NAT Port-Mapping-Protocol) or for
the masochists, UPnP. I see a lot of peer-to-peer software like
Bittorrent clients now support both to deal with NATs.

NAT-PMP draft/spec:

Maybe this library is usable? (No personal experience with it.)


On 2/23/12, Satheesh Kumar <> wrote:
> Basically what I want need is this:
> Two devices must connect and send data to one another(without an external
> server)  using tcp/udp.
> The devices are behind NAT.
> I read that this may be possible using a method called UDP Hole Punching.
> So how do I achieve this? I have a server (seems hole punching requires a
> server) but the actual data transfer must be without using an external
> server.
> Any help is appreciated.

Beginning iPhone Games Development