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I am using ubuntu 12.04LTS on my vaio laptop and I am in a situation that I have to use two different VPNs to have a good internet access and I don't know how to achieve that.because when I click on a VPN to connect(through Networks->VPN Connections), current connected VPN will be disconnected first.

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Are you trying to multiplex? Wouldn't the bottleneck be your last-mile connection to your (physical) ISP, if you have a good VPN service? – hexafraction Oct 17 '12 at 22:36
No, I'm just a user wants to have two connected VPNs together to have access both resources simultaneously. – Peyman Mahdian Oct 17 '12 at 22:47

As far as I know, you can only run one VPN using Network Manager. I have to run two VPNs (openvpn) at work, too. I connect to the first with Network Manager and to the second using a terminal. I have installed the byobu terminal emulator for this, because you can detach the vpn session from it (using the F6 key).

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Could you please add more details about your answer,specially about byobu terminal emulator. – Peyman Mahdian Oct 18 '12 at 14:51
You can use any terminal, e.g. the standard gnome terminal (just type "terminal" in the Dash to find it). To start a openvpn session, navigate to the directory containing your vpn certificates, then type "sudo openvpn <your_vpn>". You will be asked to type first your sudo-password and then your vpn username and password. If you have done everything right, the vpn session will be running until you stop it by pressing ctrl+c in the terminal window. I only prefer byobu because you can close the terminal without stopping the vpn process. It can be installed from Ubuntu Software Center. – speter Oct 18 '12 at 22:17
,I've done what you said and I get this----> sudo: openvpn: command not found – Peyman Mahdian Oct 18 '12 at 22:34
Sounds loke you haven't installed openvpn yet. To do so, open a terminal, type "sudo apt-get update && sudo apt-get install openvpn". After the installation, try again. – speter Oct 18 '12 at 22:45
What is <your_vpn>, because when I write my VPN name in VPN Connections, I get this --> Options error: In [CMD-LINE]:1: Error opening configuration file: XXX – Peyman Mahdian Oct 19 '12 at 14:58

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