On 29/06/2020 04:23, Dennis Lee Bieber wrote:
> On Sun, 28 Jun 2020 22:10:33 +0200, "R.Wieser" 
> declaimed the following:
>
>> But to make it absolutily clear, in my explanation the RPi is *passive*.  It
>> waits for connections initiated by both hosts, and only than tries to / can
>> write received packets to the other interface.
>
>  Which is an active process -- somehow you need to implement a protocol
> in which one side can say "I want to transfer data to other side" AND the
> other side has to say "I want to receive data from the first side"...

The OP hasn't stated exactly what applications and/or protocols are
required for this "post office", but if files are sufficient, you could
use OwnCloud (roll your own Dropbox). This would allow files to be kept
synchronised between machines but with no direct network connection
between them. The Pi runs the OwnCloud service and accepts connections
from each network interface, but does not route any data between the
interfaces.

---druck

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