In this recipe, we will create a captive portal with authentication through pfSense's voucher system. Vouchers are an ideal form of authentication in scenarios where you want to provide access to one of your networks on a temporary basis. Setting up access via vouchers involves generating a series of voucher codes that are then issued to users. These vouchers are good for a fixed period of time (you can define this period). You can also track network usage by keeping track of which voucher codes are given to certain users.