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Re: How could I get a connection to an UDP port through two NATs that I don't own?

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On 2016-05-30 11:07, Jorgen Grahn wrote:
> On Mon, 2016-05-30, Laszlo Lebrun wrote:
>> Laszlo Lebrun schrieb am 30.05.2016 :
>>> Hi experts here,
>>>
>>> I am trying to get an internet connection between two UMTS provided networks.
>>>
>>> The problem ist that the UMTS providers don't provide public IPs at each 
>>> side.
>>>
>>> Has anyone got a clue how to encapsulate the communication to achiev this?
>>
>> Of course, I have got no way to enable VPN pass-thoughs on the UMTS 
>> provided NATs, but i could run a PHP "buttler" routine on a third party 
>> server with a fixed IP.
>> The volume of data is low: (Domotic application)
> 
> To clarify the description a bit: you have two hosts A and B.  Both
> have internet access, but are behind NAT (different NAT devices I
> guess).  And you want to be able to use UDP from A to B (and the other
> way around?)
> 
> I don't know the answer; just wanted to boil down the question.  It
> feels like you need at least one more host with a public address to
> pull this off.  And some kind of tunneling.

This is what most do, use a known server as intermediary, and have both
extremes register there. That is, both sides have to initiate and keep a
connection with the intermediary.

Mail would do: one side sends an email to a server, the other side picks
up the email with imap. No direct connection between the two sides.

Have a read at STUN (wikipedia). Perhaps there are ideas or uses there.

-- 
Cheers, Carlos.

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Thread

How could I get a connection to an UDP port through two NATs that I don't own? Laszlo Lebrun <lazlo.lebrun@googlemail.com> - 2016-05-30 06:39 +0200
  Re: How could I get a connection to an UDP port through two NATs that I don't own? Laszlo Lebrun <lazlo.lebrun@googlemail.com> - 2016-05-30 06:54 +0200
    Re: How could I get a connection to an UDP port through two NATs that I don't own? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2016-05-30 09:07 +0000
      Re: How could I get a connection to an UDP port through two NATs that I don't own? "Carlos E.R." <robin_listas@invalid.es> - 2016-05-30 14:14 +0200
      Re: How could I get a connection to an UDP port through two NATs that I don't own? Laszlo Lebrun <lazlo.lebrun@googlemail.com> - 2016-05-30 21:09 +0200
        Re: How could I get a connection to an UDP port through two NATs that I don't own? William Unruh <unruh@invalid.ca> - 2016-05-30 20:56 +0000
          Re: How could I get a connection to an UDP port through two NATs that I don't own? Laszlo Lebrun <lazlo.lebrun@googlemail.com> - 2016-05-31 07:24 +0200
            Re: How could I get a connection to an UDP port through two NATs that I don't own? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2016-05-31 09:39 +0300
            Re: How could I get a connection to an UDP port through two NATs that I don't own? William Unruh <unruh@invalid.ca> - 2016-05-31 14:53 +0000
        Re: How could I get a connection to an UDP port through two NATs that I don't own? Aleksandar Kuktin <akuktin@gmail.com> - 2016-06-11 10:51 +0000
          Re: How could I get a connection to an UDP port through two NATs that I don't own? "Carlos E. R." <robin_listas@invalid.es> - 2016-06-11 14:15 +0200
          Re: How could I get a connection to an UDP port through two NATs that I don't own? Rick Jones <rick.jones2@hpe.com> - 2016-06-11 23:21 +0000
            Re: How could I get a connection to an UDP port through two NATs that I don't own? Stefan Monnier <monnier@iro.umontreal.ca> - 2016-06-15 23:11 -0400
      Re: How could I get a connection to an UDP port through two NATs that I don't own? Stefan Monnier <monnier@iro.umontreal.ca> - 2016-05-31 22:10 -0400
        Re: How could I get a connection to an UDP port through two NATs that I don't own? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2016-06-01 09:58 +0300
          Re: How could I get a connection to an UDP port through two NATs that I don't own? Stefan Monnier <monnier@iro.umontreal.ca> - 2016-06-01 09:22 -0400

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