[erlang-questions] Simple NAT traversal
Wed Feb 1 14:54:35 CET 2012
You are right and thank you again for your help
I am in a corporate intranet, so i do not have access to the outside
world and there are a couple of nats between the networks.
On 1 Feb., 14:37, Edward Wang <> wrote:
> A tcp server itself is simple enough, but that's another piece of
> software running on a separated machine. That's a big disadvantage. On
> the other hand, a UPnP control point is something you can integrate
> into your own application, given your NAT device speaks UPnP and you
> want to deal with the protocol.
> On Wed, Feb 1, 2012 at 9:19 PM, eigenfunction <> wrote:
> > Thank you for the response. But before i wade into that territory,
> > do you think it will be easier than just writing a tcp server?
> > Anyway, i am going to check that out.
> > On 1 Feb., 10:50, Edward Wang <> wrote:
> >> If your NAT device supports UPnP, you can ask for its external address
> >> using UPnP protocol. But there's nothing simple in it. UPnP is a
> >> horrible protocol.
> >> That said, if you do want to try this, you can check out UPnP
> >> implementation in etorrent. I did that about one year ago for opening
> >> port mapping. The related source code are
> >> (https://github.com/edwardw/etorrent/tree/master/apps/etorrent/src):
> >> etorrent_upnp_sup.erl
> >> etorrent_upnp_proto.erl
> >> etorrent_upnp_net.erl
> >> etorrent_upnp_handler.erl
> >> etorrent_upnp_entity.erl
> >> They are quite standalone and complete UPnP implementation. Take a
> >> look at how add_port_mapping is implemented:
> >> https://github.com/jlouis/etorrent/blob/master/apps/etorrent/src/etor...
> >> It should be easy enough to add your own get_external_address
> >> function, which is defined in following specification:
> >> http://upnp.org/specs/gw/UPnP-gw-WANIPConnection-v1-Service.pdf
> >> Regards,
> >> Edward
> >> On Wed, Feb 1, 2012 at 4:25 PM, eigenfunction <> wrote:
> >> > Hi everybody,
> >> > i have an erlang application running behind a nat. Now i have come to
> >> > a point where i need to know my public ip. I was thinking about
> >> > running a tiny tcp server behind the nat whose sole purpose would be
> >> > to send me my public ip. My question is this: isn't there a more
> >> > simple alternative? Heck, even if i could determine the public ip of
> >> > the NAT device without doing a "backflip" it will be enough for my
> >> > case.
> >> > Any idea?
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