title: L2TP/IPSEC PSK Application for Android using C# and DotRas
body: <p>I have been searching for couple months and still didn't get the solution to build a VPN application using L2TP/IPSEC PSK using Android native language. I tried ToyVpn but didn't see how you pass username and password to server. I didn't tried openvpn since it didn't support TAP mode. So I just want to ask:</p>
  
  <ol>
  <li>Is it possible to build L2TP/IPSEC PSK applications for Android 4.x using vpnservice API?</li>
  <li>Is it possible to build L2TP/IPSEC PSK applications for Android 4.x using C# and DotRas (<a href="https://dotras.codeplex.com/" rel="nofollow">https://dotras.codeplex.com/</a>)?</li>
  </ol>