I can confirm that the networkmanager-strongswan package does not
address this. I doubt the networkmanager-openswan package does either.
networkmanager-strongswan does not include the L2TP side. Pure IPSec
can be used for VPN, in fact that is easiest in Linux, but Windows and
OS X complicate
I can confirm the networkmanager-strongswan package does not work for
L2TP/IPSec. It implements a pure IPSec VPN. IPSec VPN's are easy to
setup in Linux, but difficult or impossible in Windows and OS X.
--
NM 0.7 No option for connecting to L2TP IPSEC VPN
https://bugs.launchpad.net/bugs/264691
