can anyone tell me the use of tun interface in openvpn? as far as i read, it is used to tunnel all the traffic from the PC over the ssl tunnel. But incase of VPN, i suppose all the traffic initiated from remote-pc should have the ip-address assigned from the private network by the ssl-vpn server. So does tun interface helps in identifyin the source-ip to be used for all traffic from remote pc? Or is there any doc explains how the openvpn client side works for better understanding?