IPsec VPN Server Auto Setup Scripts
Set up your own IPsec VPN server in just a few minutes, with both IPsec/L2TP and Cisco IPsec on Ubuntu, Debian and CentOS. All you need to do is provide your own VPN credentials, and let the scripts handle the rest.
An IPsec VPN encrypts your network traffic, so that nobody between you and the VPN server can eavesdrop on your data as it travels via the Internet. This is especially useful when using unsecured networks, e.g. at coffee shops, airports or hotel rooms.
We will use Libreswan as the IPsec server, and xl2tpd as the L2TP provider.
» See also: IPsec VPN Server on Docker
Read this in other languages: English, 简体中文.
Table of Contents
- Quick start
- Features
- Requirements
- Installation
- Next steps
- Important notes
- Upgrade Libreswan
- Bugs & Questions
- Uninstallation
- See also
- License
Quick start
First, prepare your Linux server* with a fresh install of Ubuntu LTS, Debian or CentOS.
Use this one-liner to set up an IPsec VPN server:
wget https://git.io/vpnsetup -O vpnsetup.sh && sudo sh vpnsetup.sh
If using CentOS, replace the link above with https://git.io/vpnsetup-centos
.
Your VPN login details will be randomly generated, and displayed on the screen when finished.
For other installation options and how to set up VPN clients, read the sections below.
* A dedicated server or virtual private server (VPS). OpenVZ VPS is not supported.
Features
- New: The faster
IPsec/XAuth ("Cisco IPsec")
mode is supported - New: A pre-built Docker image of the VPN server is now available
- Fully automated IPsec VPN server setup, no user input needed
- Encapsulates all VPN traffic in UDP - does not need ESP protocol
- Can be directly used as "user-data" for a new Amazon EC2 instance
- Includes
sysctl.conf
optimizations for improved performance - Tested with Ubuntu 18.04/16.04, Debian 9/8 and CentOS 7/6
Requirements
A newly created Amazon EC2 instance, from one of these images:
- Ubuntu 18.04 (Bionic) or 16.04 (Xenial)
- Debian 9 (Stretch) or 8 (Jessie)
- CentOS 7 (x86_64) with Updates
- CentOS 6 (x86_64) with Updates
- Red Hat Enterprise Linux (RHEL) 7 or 6
Please see detailed instructions and EC2 pricing.
-OR-
A dedicated server or KVM/Xen-based virtual private server (VPS), freshly installed with one of the above OS. OpenVZ VPS is not supported, users could instead try OpenVPN.
This also includes Linux VMs in public clouds, such as DigitalOcean, Vultr, Linode, Google Compute Engine, Amazon Lightsail, Microsoft Azure, IBM Cloud, OVH and Rackspace.
» I want to run my own VPN but don't have a server for that
Advanced users can set up the VPN server on a $35 Raspberry Pi 3. Learn more in these articles: [1] [2].
Installation
Ubuntu & Debian
First, update your system with apt-get update && apt-get dist-upgrade
and reboot. This is optional, but recommended.
To install the VPN, please choose one of the following options:
Option 1: Have the script generate random VPN credentials for you (will be displayed when finished):
wget https://git.io/vpnsetup -O vpnsetup.sh && sudo sh vpnsetup.sh
Option 2: Edit the script and provide your own VPN credentials:
wget https://git.io/vpnsetup -O vpnsetup.sh
nano -w vpnsetup.sh
[Replace with your own values: YOUR_IPSEC_PSK, YOUR_USERNAME and YOUR_PASSWORD]
sudo sh vpnsetup.sh
Note: A secure IPsec PSK should consist of at least 20 random characters.
Option 3: Define your VPN credentials as environment variables:
# All values MUST be placed inside 'single quotes'
# DO NOT use these special characters within values: \ " '
wget https://git.io/vpnsetup -O vpnsetup.sh && sudo \
VPN_IPSEC_PSK='your_ipsec_pre_shared_key' \
VPN_USER='your_vpn_username' \
VPN_PASSWORD='your_vpn_password' \
sh vpnsetup.sh
Note: If unable to download via wget
, you may also open vpnsetup.sh (or vpnsetup_centos.sh) and click the Raw
button. Press Ctrl-A
to select all, Ctrl-C
to copy, then paste into your favorite editor.
CentOS & RHEL
First, update your system with yum update
and reboot. This is optional, but recommended.
Follow the same steps as above, but replace https://git.io/vpnsetup
with https://git.io/vpnsetup-centos
.
Next steps
Get your computer or device to use the VPN. Please refer to:
Configure IPsec/L2TP VPN Clients
Configure IPsec/XAuth ("Cisco IPsec") VPN Clients
Step-by-Step Guide: How to Set Up IKEv2 VPN
If you get an error when trying to connect, see Troubleshooting.
Enjoy your very own VPN! ✨🎉🚀✨
Important notes
Read this in other languages: English, 简体中文.
For Windows users, this one-time registry change is required if the VPN server and/or client is behind NAT (e.g. home router).
The same VPN account can be used by your multiple devices. However, due to an IPsec/L2TP limitation, if you wish to connect multiple devices simultaneously from behind the same NAT (e.g. home router), you must use only IPsec/XAuth mode.
For servers with an external firewall (e.g. EC2/GCE), open UDP ports 500 and 4500 for the VPN. Aliyun users, see #433.
If you wish to add, edit or remove VPN user accounts, see Manage VPN Users. Helper scripts are included for convenience.
Clients are set to use Google Public DNS when the VPN is active. If another DNS provider is preferred, replace 8.8.8.8
and 8.8.4.4
in both /etc/ppp/options.xl2tpd
and /etc/ipsec.conf
, then reboot your server. Advanced users can define VPN_DNS_SRV1
and optionally VPN_DNS_SRV2
when running the VPN setup script.
Using kernel support could improve IPsec/L2TP performance. It is available on Ubuntu 18.04/16.04, Debian 9 and CentOS 7/6. Ubuntu users: Install linux-modules-extra-$(uname -r)
(or linux-image-extra
), then run service xl2tpd restart
.
To modify the IPTables rules after install, edit /etc/iptables.rules
and/or /etc/iptables/rules.v4
(Ubuntu/Debian), or /etc/sysconfig/iptables
(CentOS/RHEL). Then reboot your server.
When connecting via IPsec/L2TP
, the VPN server has IP 192.168.42.1
within the VPN subnet 192.168.42.0/24
.
The scripts will backup existing config files before making changes, with .old-date-time
suffix.
Upgrade Libreswan
The additional scripts vpnupgrade.sh and vpnupgrade_centos.sh can be used to upgrade Libreswan (changelog | announce). Edit the SWAN_VER
variable as necessary. Check which version is installed: ipsec --version
.
# Ubuntu & Debian
wget https://git.io/vpnupgrade -O vpnupgrade.sh
# CentOS & RHEL
wget https://git.io/vpnupgrade-centos -O vpnupgrade.sh
Bugs & Questions
- Got a question? Please first search other people's comments in this Gist and on my blog.
- Ask VPN related questions on the Libreswan or strongSwan mailing list, or read these wikis: [1] [2] [3] [4] [5].
- If you found a reproducible bug, open a GitHub Issue to submit a bug report.
Uninstallation
Please refer to Uninstall the VPN.
See also
License
Copyright (C) 2014-2019 Lin Song
Based on the work of Thomas Sarlandie (Copyright 2012)
This work is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License
Attribution required: please include my name in any derivative and let me know how you have improved it!