[Gambas-user] UDP hole punching

[John Dovey]

Here's the full src file

 BaShare-gambas-src-0.4.2.tar.gz
<https://drive.google.com/file/d/1Zcr1r51fWtGWsrOLO3o_ImPj-zSiBhiA/view?usp=drive_web>


On Fri, 4 Jun 2021 at 14:23, John Dovey <dovey.john at gmail.com> wrote:

> I found this as part of BaShare (on the "Farm" I think.
> Investigating now. Seems to hold out some hope.
>
>
>  miniupnpc_1.4.orig.tar.gz
> <https://drive.google.com/file/d/10uSD2Uuw0maYldt6XLBCH-1jteRyYcHy/view?usp=drive_web>
>
>
> On Fri, 4 Jun 2021 at 07:51, Brian G <brian at westwoodsvcs.com> wrote:
>
>> It is far more difficult for tcp as it is a bidirctional protocol which
>> requires an open connection.  Nat port translation is not predictable.
>> Both sessions must guess the port number the nat will allocate to the
>> peer and then do an open port on the others sides nat port.  Some nat
>> processes do not support predictable port allocation . So is not a very
>> reliable way to do this in tcp .
>> Better to map a port number in this case on the client I think.
>> Most routers now a day support port mapping through upnp.
>>
>> --
>> Thanks
>> Brian G
>> Friday, 04 June 2021, 03:34AM -07:00 from John Dovey dovey.john at gmail.com
>> :
>>
>>
>> I am attaching a demo that shows it works beautifully.
>>
>> yYes it does!! Thank you, tested it and I could get two clients, each
>> behind their own NAT, to send and receive data via UDP.
>>
>>
>> One more thing to pay attention to!
>> Need to occasionally communicate minimally with the server, otherwise it
>> may lose connection
>>
>>
>> Let me see if I understand exactly what’s happening here.
>>
>> A public server is running udp01. That is always available and can be
>> contacted by anyone who initiates a connection.
>>
>> When client A and B both connect to the server, your program connects
>> them together and that established the path that all further UDP traffic
>> between A and B will flow.
>>
>> To ensure the path remains open, A and B need to contact the server once
>> a minute or so…
>>
>> Is that essentially correct?
>>
>>
>> Now for my next question. Is it possible to do the same for tcp?
>>
>> John
>>
>>
>> --
>> Sent from Gmail Mobile
>>
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>>
>>
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>>
>
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