OpenVPN Support Forum

That's my problem.

I have access to the internet through a wifi connection (Host 1 - 192.168.1.101) in my private network 192.168.1.0/24.
The router has an LAN interface 192.168.1.1 and a WAN interface 187.xx.xx.xx.

In this same network there is a host 2 (192.168.1.100) that is running an openvpn server with address 10.4.0.1. This server is in a Windows 7 with redirect-gateway. The forwarding in windows is already perfectly running.

I'd like to start a download from the internet on host 1 and during the download, establish a tunnel to the server and go on the download via tunnel.
The host 1's active connection must be transfered to the tunnel.

Is it possible ?

I need this a lot. Any help ?
Thanks.

it's not possible to transfer an existing active connection from one connection to another. This has nothing to do with VPNs but with basic TCP/IP networking:

All network connections are based on SRC IP + SRC Port talking to DEST IP + DEST Port
If you change the SRC IP and/or SRC Port then it's a new connection. Unless your download software can do an automatic reconnect you're out of luck

Now a have a new network configuration.

Internet ---------[1] Notebook1 [2]-------[3] Wifi Router [3]----- [4] Cel Android

[1] = cabled real IP
[2] = 192.168.1.1
[3] = 192.168.1.2
[4] = 192.168.1.3

I'd like to establish a tunnel between Android and the real IP of notebook 1, so when Android go to 3G network all traffic arriving in notebook 1 from the internet to 192.168.1.3 (Android) must be forwarded to the Android address in tunnel.

In tunnel notebook 1 has address 10.3.0.1 and Android 10.3.0.2

I tried to use route 192.168.1.3 255.255.255.255 10.3.0.2 in configuration openvpn file in notebook 1.
But when this route is added to routing table I can't get a ping response from Android.

Notebook 1 runs Windows 7
Could this be a limitation of Windows 7 ?

I'd like to establish a tunnel between Android and the real IP of notebook 1, so when Android go to 3G network all traffic arriving in notebook 1 from the internet to 192.168.1.3 (Android) must be forwarded to the Android address in tunnel.

You can't do this, because all trafic from internet will arrive to you public IP, not the unrouted on real internet IP 192.168.1.3. Private ip ranges a dropped on the internet switches.
You have to use a more complex software and de-packet all packets till the very first packet wich may hold the source IP of 192.168.1.3. See the IP standart.