If you are using Ubuntu as your desktop client or if you are using ubuntu as a proxy server and you want to provide un restricted internet access to users (I assume for learning purposes like youtube) , You can use vpnbook vpn connection to provide access.b You can use this service in number of ways, either via mikrotik, proxy, single pc or for any other pruposes. Following is a short method to do the task.
mkdir /temp cd /temp wget http://www.vpnbook.com/free-openvpn-account/VPNBook.com-OpenVPN-UK1.zip wget http://www.vpnbook.com/free-openvpn-account/VPNBook.com-OpenVPN-Euro1.zip
Now Unzip the package you download, but first intall UNZIP tool and then unzip it.
apt-get install unzip unzip VPNBook.com-OpenVPN-UK1.zip unzip VPNBook.com-OpenVPN-Euro1.zip
Now install OPENVPN client tool. It will be used later to dial the vpn connection for vpnbook,
apt-get install openvpn
Now to connect to vpnbook server, use following command
openvpn --config vpnbook-uk1-tcp443.ovpn . OR you can also try following . openvpn --config vpnbook-euro1-tcp80.ovpn
It will ask user name and password, use following
Make sure to use Google DNS 22.214.171.124 as your primary dns for resolving addresses.