Sniffer and VPN-Tunnel

[student-uni]

Hallo everybody,

I try to count the Traffic. /Code of V2Software in Attach./

If i use direct connection (for example RDP-1 and RDP-2), everything is ok.
I see each Packet, und I can see SenderIP und ReceiverIP
Sender - is my NetworkInterface
und Receiver is RDP-IP.
So, I can count, how much bytes on each RDP have sent und received.

But if I start the VPN-connection, and after that - Routing, und after that RDP-1 und RDP-2, then I have following:
Sender - is my NetworkInterface
und Receiver is VPN-IP
Und I cant see, how much bytes go throu RDP-1,
und How much throu RDP-2.

I see whole Traffic (RDP1+RDP2)

Then i start folgendes:
Instead of my NetworkInterface I start to see Virual Interface of VPN.
On Virtual Interface I see the Packets with SenderAdress, so
I see, wihich Packets of RDP1 und which packets of RDP2.

The Problem with the outgoing Packets,
here see ich neither to RDP1, no to RDP2

Question:
What can i do , if I want outgoing-TRaffic counting (throu VPN und Routing)

So:

MyNetworkCard (for ex. 192.168.0.1) < - > RDP (for ex. 198.166.0.2) - is No Problem

MyNetworkCard (for ex. 192.168.0.1) < - > VPN (for ex. 198.166.0.2) < - > Virtual Interface (224.228.162.3) <-> RDP1 (for ex. 198.166.0.2)

On MyNetworkCard I see Packets 192.168.0.1 <-> 198.166.0.2
Incoming und outgoing

On Virtual Interface I See only incoming
Sender RDP1 (for ex. 198.166.0.2)
Receiver Virtual Interface (224.228.162.3)

If I have two RDPs, I cant count how much outgpoing-Trafic of RDP1
und how much of RDP2

Question:
How can I catch outgoing Packet and terminate
who is receiver (RDP1 or RDP2)

Thank's and

Sorry for bad English
have not long to speak