[erlang-questions] Simple NAT traversal

eigenfunction <>
Wed Feb 1 22:10:12 CET 2012


Typical big co network with security concerns at every turn :-)

On Feb 1, 8:37 pm, Ivan Ostres <> wrote:
> Either your network is badly designed or you are doing something you
> really shouldn't ;-).
>
> On 2/1/12 7:48 PM, eigenfunction wrote:
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> > Our NATs are dynamic alas :-(
>
> > On Feb 1, 3:54 pm, Max Bourinov<>  wrote:
> >> Our corporate clients use static IP for such tasks. Maybe it is possible to
> >> have static IP?
>
> >> Best regards,
> >> Max
>
> >> On Wed, Feb 1, 2012 at 4:54 PM, eigenfunction<>  wrote:
> >>> @Edward
> >>> You are right and thank you again for your help
> >>> @Michael
> >>> 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.
> >>>> -Edward
> >>>> 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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