Github user rhtyd commented on the pull request:

    https://github.com/apache/cloudstack/pull/872#issuecomment-217344487
  
    @jayapalu I spent several hours testing this PR, my conclusion is that it 
cannot be used for production usage yet and need more tweaking;
    
    - We should consider installing strongswan to 5.x using wheezy-backports, 
while building template, we can do: `apt-get -t wheezy-backports install 
strongswan`
    - NAT-ed clients need to be supported (those clients which are not on a 
public IP but behind a NAT), I tested with Windows 10, OSX's default L2TP 
client, Android's L2TP client -- all of them failed for me. Ubuntu 16.04 has 
issues with strongswan NetworkManager integration so I could not test using 
that. I would expect the VPN replacement to allow users to use all of these 
clients/OSs in both NAT-ed, double NAT-ed and non NAT-ed cases. Our test cases 
should cover VPN access usage from clients on: Windows 10/8/7, OSX and Linux 
(NetworkManager with l2tp or strongswan-nm), and optionally for Android and iOS 
phone l2tp clients.
    - I tried to fix the NAT issues, but I could not figure the configs out
    - I could not test site to site VPN or VPN customer gateway features
    
    :-1: 


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