Well.. I know that this will be possible using OpenVPN but... I need to deal with users, and you know how limited users are.. Also, PPTP is compromised since some time ago, and the options are turning dark.
But I needed a VPN solution, and fast. At least temporary so I can think about in something else later. So I choose L2TP since is easily to configure in windows and.. you know how "clever" windows users use to be.. :D
Well. after the configuration in my work's pfsense and testing in my windows vm, I need to test on a Mac OS X cause some people in my work have Macbooks.. so I discovered that MacOS (ATM) only accepts out-of-the-box Cisco IPsec, PPTP and L2TP+IPSEC. Apple please...
Well, nothing is lost, just open Terminal.app and do this:
echo "plugin L2TP.ppp" > options
echo "l2tpnoipsec" >> options
sudo mv options /etc/ppp
And voilá, now your mac can connect to a goddamit L2TP without IPsec.
Obs: I don't know how much I can trust in L2TP but...