[Twisted-Python] Punching a firewall with Twisted?

Glyph Lefkowitz glyph at twistedmatrix.com
Thu Jun 17 12:21:16 EDT 2010

On Jun 17, 2010, at 8:37 AM, Stefan Reich wrote:

> Dear 'Twisted' experts!
> I have a quick question that I am sure one of you guys can answer easily:
> What I want to do is open an incoming port on the router that connects 
> my computer to the Internet. More precisely, I want my Python app do 
> that automatically.
> In other words, this is about punching a hole into a firewall.
> I know that this is possible because there are applications that do 
> that. Deluge does this, and Deluge uses Twisted. So I have tried to find 
> out how/where Deluge tells Twisted to do this, but the Deluge sources 
> are quite sizey, and I haven't found that particular needle in the 
> haystack yet.
> So, can one of you people enlighten me here? :)
> Thanks & have a nice day!
> Stefan

I'm not sure about Deluge, but <http://divmod.org/trac/wiki/DivmodVertex> does some NAT hole-punching.  It does it via sending UDP packets though, not by communicating directly with your router.

Good luck; this is always an interesting problem ;).


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