Installing strongSwan on Windows 11

1. Download the Win64 MSI file for strongSwan from the official website: https://www.strongswan.org/.

2. Double-click the downloaded MSI file to begin the installation process.

3. Follow the on-screen instructions to complete the installation. Be sure to select the desired options when prompted.

4. Once the installation is complete, navigate to the installation directory (by default: C:\Program Files\strongSwan\).

5. Open the ipsec.conf file in a text editor (such as Notepad).

6. Edit the configuration to fit your needs. A basic configuration for connecting to a remote VPN server might look something like this:

conn myvpn
   left=%defaultroute
   leftsubnet=0.0.0.0/0
   leftfirewall=yes
   right=<remote-server-ip>
   rightsubnet=<remote-subnet>
   authby=secret
   auto=start

7. Save the ipsec.conf file.

8. Open the ipsec.secrets file in a text editor.

9. Add the shared secret for your VPN connection to the file. This is typically provided by your VPN provider.

<local-ip> <remote-ip> : PSK "<shared-secret>"

10. Save the ipsec.secrets file.

11. Open the Command Prompt as an administrator.

12. Navigate to the installation directory (by default: C:\Program Files\strongSwan\).

13. To start the strongSwan service, enter the following command:

net start ikeext

14. To connect to your VPN, enter the following command:

ipsec up myvpn

15. To disconnect from your VPN, enter the following command:

ipsec down myvpn

Congratulations! You have successfully installed strongSwan and connected to your VPN on Windows 11.