What is the best way to organize a VPN in my case?

Question

VPN

There is a small office. There is a purchased VPN server, to which you can connect via PPTP or L2TP / IPsec (there is no OpenVPN).
There is also a dedicated computer with two network cards. Question: how to properly organize the access of the entire office to the Internet through a VPN server?
I tried Zentyal as a firewall, but I didn't find the L2TP/PPTP Client package for the free version.
Perhaps there is something similar with PPTP/L2TP support?
Or can it be possible to raise something similar on Windows / Linux?
If you send me a link to detailed instructions, I will be very grateful. So far, the search has yielded no results.
PS I would be grateful also just for the theory. Buy Mikrotik DO NOT offer.

Answer 1

Setting up L2TP/IPsec can turn out to be a very non-trivial task on linux - I don't advise you, on windows it's easier. There are plenty of instructions on the internet.
PPTP is easy to set up on both operating systems and the instructions are easy to google, but it is very outdated and not recommended for use.
Another option is to put something like vyos on the server (a free software router, the setting is similar to the cisco / juniper settings) ZY
. Mikrotik would really save you a lot of time.

Answer 2

This is easily done on any popular Linux distribution with an ipsec client installed and a routing/NAT firewall. The first thing that comes to mind is strongSWAN + iptables/nftables. The setup is quite trivial.

Answer 3

There's ubunta inside, lift the tunnel with handles.
That clearOS, that zental, that other trash - commerce in its purest form. Don't expect good things from them.