https://forum.pfsense.org/index.php?topic=83321.0 ideally shows how to connect a mac which uses l2tp over ipsec. No luck.
pfsense docs are here on this topic. Checking …
I did get the cisco ipSec working for an iPhone to connect to pfSense. See this article. I have done no testing to see what one can do – but it said you can connect. What I really wanted was LT2P over iPsec because this is the default for all the clients at my customers and they all have iPhones.