setup-ipsec-vpn/README.md

IPsec/L2TP VPN Server Auto Setup Scripts

Scripts for automatic configuration of IPsec/L2TP VPN server on Ubuntu 14.04 & 12.04, Debian 8 and CentOS/RHEL 6 & 7. All you need to do is providing your own values for IPSEC_PSK, VPN_USER and VPN_PASSWORD, and let them handle the rest.

We will use Libreswan as the IPsec server, and xl2tpd as the L2TP provider.

Link to my VPN tutorial with detailed usage instructions

Features

• Fully automated IPsec/L2TP 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
• Automatically determines public IP and private IP of server
• Includes basic IPTables rules and sysctl.conf settings
• Tested with Ubuntu 14.04 & 12.04, Debian 8 and CentOS 6 & 7

Requirements

A newly created Amazon EC2 instance, using these AMIs: (See instructions)

• Ubuntu 14.04 (Trusty) or 12.04 (Precise)
• Debian 8 (Jessie) EC2 Images
• CentOS 7 (x86_64) with Updates HVM
• CentOS 6 (x86_64) with Updates HVM

-OR-

A dedicated server or KVM/Xen-based Virtual Private Server (VPS), running one of these OS:
 (Note: Using the VPN scripts on a freshly installed system is recommended)

• Ubuntu 14.04 (Trusty) or 12.04 (Precise)
• Debian 8 (Jessie)
• Debian 7 (Wheezy) - Not recommended. Requires this workaround to work.
• CentOS / Red Hat Enterprise Linux (RHEL) 6 or 7

OpenVZ VPS users should instead try Nyr's OpenVPN script.

» I want to run my own VPN but don't have a server for that

⚠️ DO NOT run these scripts on your PC or Mac! They should only be run on a dedicated server or VPS!

Installation

For Ubuntu and Debian:

First, update your system with apt-get update && apt-get dist-upgrade and reboot. This is optional, but recommended.

wget https://github.com/hwdsl2/setup-ipsec-vpn/raw/master/vpnsetup.sh -O vpnsetup.sh
nano -w vpnsetup.sh
[Edit and replace IPSEC_PSK, VPN_USER and VPN_PASSWORD with your own values]
/bin/sh vpnsetup.sh

For CentOS and RHEL:

First, update your system with yum update and reboot. This is optional, but recommended.

yum -y install wget nano
wget https://github.com/hwdsl2/setup-ipsec-vpn/raw/master/vpnsetup_centos.sh -O vpnsetup_centos.sh
nano -w vpnsetup_centos.sh
[Edit and replace IPSEC_PSK, VPN_USER and VPN_PASSWORD with your own values]
/bin/sh vpnsetup_centos.sh

If unable to download via wget, you may alternatively 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.

Next Steps

Get your computer to use the VPN. Search the web for instructions, e.g. https://www.google.com/search?q=setup+l2tp+client

Enjoy your very own VPN! ✨🎉🚀✨

Important Notes

For Windows users, a one-time registry change is required if the VPN server and/or client is behind NAT (e.g. home router). In addition, make sure CHAP is enabled under "Allow these protocols" in the "Security" tab of VPN connection properties.

Android 6 (Marshmallow) users: After install, edit /etc/ipsec.conf and append ,aes256-sha2_256 to both ike= and phase2alg=. Then add a new line sha2-truncbug=yes. Indent lines with two spaces. Finally, run service ipsec restart.

iPhone/iPad users: In iOS settings, choose L2TP (instead of IPSec) as the VPN type. In case you are unable to connect, edit ipsec.conf and replace rightprotoport=17/%any with rightprotoport=17/0. Then restart ipsec service.

If you wish to enable multiple VPN users with different credentials, just edit a few lines in the scripts.

Clients are configured to use Google Public DNS when the VPN is active. To change, set ms-dns in options.xl2tpd.

If using Amazon EC2, open UDP ports 500 & 4500 and TCP port 22 (optional, for SSH) in the instance's security group.

If you configured a custom SSH port or wish to allow other services, edit the IPTables rules within the scripts before using.

The scripts will backup your existing config files before making changes, to the same folder with .old-date-time suffix.

Upgrading Libreswan

The additional scripts vpnupgrade_Libreswan.sh and vpnupgrade_Libreswan_centos.sh can be used to periodically upgrade Libreswan to the latest version. Check the official website and update the SWAN_VER variable as necessary.

Bugs & Questions

• Have a question? Please first search other people's comments in this Gist and on my blog.
• Ask Libreswan (IPsec) related questions on this mailing list, or check out its official wiki.
• If you found a reproducible bug, open a GitHub Issue to submit a bug report.

Copyright and License

Copyright (C) 2014-2016 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!