How To Set Up Your Own IPsec VPN server on Google Cloud Platform

Setup IPsec VPN Server on Google Cloud Platform.

#1 Setup your free Google Cloud Platform account at cloud.google.com or login if you already have one.

#2 Create New Project.

#3 Create new Linux instance with IP Forwarding enabled

Machine type: f1-micro with (for testing purpose only, choose your own preference)
OS: Ubuntu 18.04 LTS Minimal
Firewall: Allow HTTPS traffic

On network interfaces, click the pencil icon to enable IP Forwarding

#3 Setup VPN Server

For more details you can follow the guide at:
https://github.com/hwdsl2/setup-ipsec-vpn

SSH to your instance and install the L2TP Server,

wget https://git.io/vpnsetup -O vpnsetup.sh && sudo sh vpnsetup.sh

In the end of the installation write down your details below that will be use to setup for VPN client.

VPN_IPSEC_PSK='your_ipsec_pre_shared_key'
VPN_USER='your_vpn_username'
VPN_PASSWORD='your_vpn_password'

#4 Open UDP Port 500 & 4500

#5 Setup your IPsec/L2TP VPN Clients

Detail guide for many kind of devices as below link:
https://github.com/hwdsl2/setup-ipsec-vpn/blob/master/docs/clients.md

Install L2TP dependencies for Ubuntu 18.04;

sudo apt-get update
sudo apt-get install network-manager-l2tp
sudo apt-get install network-manager-l2tp-gnome