How to connect via L2TP to VPN in Linux(CentOS) using MAC(macbook) configs?

Question

linux

I broke my head, memorized mana by libreswan. I do not understand.
On a macbook, this is a regular VPN client (L2TP), colleagues also have Ubuntu.
But I have CentOS and there is nothing regular a la NetworkManager with a ready-made GUI for l2tp .. So I have to poke around in search of docks for IPSec encryption. There is no way to "peep" some configs, certificates in macbook - it somehow connects without any additional generated ipsec encryption keys and other dregs described in mana.
If anyone has such experience please write - HOW!
In mac, I just added settings in network connections - domain, shared key, username and password of the user, and voilya - VPN works. I need to do this operation in CentOS7 on my home computer.
Преиветствуются любые подсказки - хотя б где MAC хранит конфиги эти со всеми этими страшными инструкциями conn бла-бла-бла, я оттуда(с macbook) их тогда скопирую! Help!