L2TP/IPSec is a popular and widely supported VPN protocol. It is built-in to most modern platforms and Mac OS X is no exception. There are some issues with this protocol and I encourage the reader to check out our VPN protocol comparison article. Read on to see how easy it is to setup a L2TP/IPSec VPN connection on Mac OS X.
The following tutorial was performed on Mac OS X Yosemite. Other versions of OS X should be similar but there might be some minor differences.