Thanks a lot. I confirm that the new config kernel works for Wheezy (3.14.28/58).
Yes, I want to use it as a server, but I have a problem with strongswan 5.2.1 or kernel 4.2.8. I succeded to compile a custom kernel, based on 4.2.8, with everything that strongswan (5.2.1) needs to work, but even if I can start and establish the tunnel, I can't access any device at the other end of the tunnel (udoo side). I tried to establish a IPSEC tunnel.
That was the reason I returned to the legacy kernel (because with strongswan 5.0.4, I can make the VPN work). Honestly, I would like to use the vanilla kernel with strongswan 5.2.1, but I really need to have ipsec working, and I couldn't make it work.
My guess is that strongswan (5.2.1) has a bug, that's why I can't make it work, the way I want. I spent hundreds of hours to make it work, but no success. The bad thing is that I can't debug anything because the daemon tells me that everything is allright, but it still doesn't work (no ping, no nothing).
Thanks again for your help.
Now, I can start to make us of 'udoo board' the way I wanted.