IKEv2/IPSec VPN
IKEv2/IPSec (Internet Key Exchange version 2 with IP Security) is a secure and efficient VPN protocol widely used for remote access and site-to-site VPNs. It is known for its speed, reliability, and support for mobile devices.
Key Features of IKEv2/IPSec
✅ Strong Security – Uses AES-256 encryption, Perfect Forward Secrecy (PFS), and certificate-based authentication.
✅ Fast and Efficient – Low overhead and faster reconnection compared to OpenVPN.
✅ Supports Mobility – Ideal for mobile users as it seamlessly reconnects when switching networks (e.g., WiFi to LTE).
✅ Built-in Support – Natively supported on Windows, macOS, iOS, and Android without additional software.
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How to Set Up IKEv2/IPSec VPN
1. Server Setup (Linux using StrongSwan)
1. Install StrongSwan on Ubuntu / Debian
sudo apt update && sudo apt install strongswan strongswan-pki libstrongswan-extra-plugins -y
2. Generate Certificates
Create a Certificate Authority (CA) and server/client certificates using strongswan-pki.
3. Configure StrongSwan
Edit /etc/ipsec.conf to define connection settings.
4. Add Authentication Credentials
Configure /etc/ipsec.secrets for PSK or certificate-based authentication.
5. Enable Forwarding & Firewall Rules
echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf
sysctl -p
Use iptables or ufw to allow VPN traffic.
6. Restart and Enable StrongSwan:
sudo systemctl restart strongswan
sudo systemctl enable strongswan
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2. Server Setup (Windows Server with RRAS)
1. Install Remote Access Role
Go to Server Manager > Add Roles and Features > Remote Access > DirectAccess and VPN (RAS).
2. Configure IKEv2 VPN
Open Routing and Remote Access (RRAS) and enable VPN access.
Set up IPSec authentication using certificates or PSK.
3. Allow Firewall Rules
Open UDP ports 500, 4500 and allow ESP (IP protocol 50).
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3. Client Configuration
Windows/macOS:
Add VPN manually in Network Settings > VPN > Choose IKEv2.
iOS/Android:
Use built-in VPN settings or apps like StrongSwan VPN Client.
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