- To access a company network via an IPsec VPN, an employee working remotely launches the VPN client from his home computer.
- He then logs in to the sign-in screen with a username and a secure password.
- The VPN concentrator (appliance) authenticates the user, applies the proper access controls, and opens a secure VPN tunnel between the user and the company network.
- The user is now within the corporate firewall, so all data traffic in and out of his system is encrypted.
The following image describes the same in better way,
