Installing StrongSwan on Ubuntu 22.04

StrongSwan is an open-source, IPsec-based VPN solution that provides secure communication over the internet. It allows you to create a virtual private network (VPN) between multiple devices, ensuring data confidentiality, integrity, and authenticity.

To install StrongSwan on Ubuntu 22.04, follow these steps:

sudo apt update

sudo apt install strongswan

1. Update the system package lists:
2. Install StrongSwan:
3. After the installation is complete, you can configure StrongSwan as per your requirements.

StrongSwan configuration involves modifying the /etc/ipsec.conf and /etc/ipsec.secrets files.

Here is a basic example of configuring StrongSwan for a site-to-site VPN:

1. Modify /etc/ipsec.conf:

sudo nano /etc/ipsec.conf

Add the following configuration:

config setup
    charondebug=all

conn myvpn
    left=192.168.1.10 # Local IP
    leftsubnet=192.168.1.0/24 # Local subnet
    [email protected] # Local ID
    right=192.168.2.10 # Remote IP
    rightsubnet=192.168.2.0/24 # Remote subnet
    [email protected] # Remote ID
    keyexchange=ikev2
    pfs=no
    auto=start

2. Modify /etc/ipsec.secrets:

sudo nano /etc/ipsec.secrets

Add the following configuration:

@domain1.example : PSK "shared_secret_for_domain1"
@domain2.example : PSK "shared_secret_for_domain2"

Note: Replace @domain1.example, @domain2.example, shared_secret_for_domain1, and shared_secret_for_domain2 with your own values.

3. Restart StrongSwan:

sudo systemctl restart strongswan

Congratulations, you have successfully installed and configured StrongSwan on Ubuntu 22.04. You can now use StrongSwan to establish secure VPN connections.

Remember to adjust the configuration according to your network setup and security requirements.