VPN

Hello together,

at the moment I am trying to implement a IPSec connection between a monowall and a Synology Diskstation.
Just a few details:

*****************
* Local Network1     *
* 192.168.10.0/24   *
*****************
           |
*****************
* Monowall              *
*****************
           |
*****************
*   Internet               *
*****************
           |
*****************
*  Fritzbox                *
* Portforwarding      *
*  (see screenshot)  *
*****************
           |
*****************
* Local Network2     *
* 192.168.12.0/24   *
*****************
           |
*******************
* Synology VPN Client  *
* 192.168.12.30          *
*******************

My first problem is that I am not really sure which information the Synology Clinet need (see screenshot)?

Serveraddress: dyndns from the monowall
Benutzername: ?
Kennwort: ?
Vorinstallierter Schlüssel: ?
Identitätsprüfung: ?

I hope someone can support me?  

Best regards
spinne84