1. client
    2. dev tun
    3. proto tcp
    4. remote 1.1.1.1 2494
    5. resolv-retry infinite
    6. nobind
    7. persist-key
    8. persist-tun
    9. ca ca.crt
    10. cert client.crt
    11. key client.key
    12. remote-cert-tls server
    13. comp-lzo
    14. verb 3
    15. auth-user-pass pass.txt