On 2014-05-04 19:52, Gert Doering wrote:
> Hi,
>
> On Sun, May 04, 2014 at 08:31:21PM +0200, Pol Hallen wrote:
>> Hi folks, I'm sorry if my question is trivial...
>>
>> My situation: 1 openvpn server, many clients over internet that uses 
>> openvpn
>>
>> My doubt is: if a client (A) exchange data from/to other client (B) 
>> with
>> ftp protocol, another client (C) can sniff the traffic from A to B? 
>> if
>> yes, is it clear traffic? (not crypted).
>
> Why should the server send data between A<->B to C?  This would never
> make sense, just for bandwidth reasons alone.
>
> (And since it does not make sense, it is not being done)
>
> The *server* can see your data, of course, as it is decrypting data 
> from
> A, looking at the headers to decide who it is for, and then 
> re-encrypting
> it when sending to B.
>


I still think the OP has asked a very good question.

Whilst the traffic won't physically go to C (at least for TUN 
networks), an answer would be great regarding whether C could de-crypt 
the traffic using the keys he/she has.

Another thing to remember is that for TAP network, C could potentially 
get some of the traffic if ARP goes funny etc...

Thanks


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