Before I changed to OpenVPN I used racoon IPSEC tool. It was very unstable for my setup, because one VPN site has a dynamical IP-Address and only with dirty workarounds was it possible to use it.
After some unsuccessful tries with openswan:( I decided to try OpenVPN and I had luck I found very useful blog of (Sébastien Wains) which was my clue to my working VPN.

I draw a little map of my VPN setup:

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