Section 3: Going beyond the Firewall

This final part will go through some extra features you can use in OPNsense to go beyond the firewall. We will explore services such as DHCP and DNS services, and how to apply web browsing controls and guestnet authorization with Web Proxy and Captive Portal. Will see how to extend Layer4 firewalling with IDS/IPS and the Sensei plugin and how to improve OPNsense availability by integrating two or more firewalls in a cluster. Finally, we will learn how OPNsense can protect websites.

This part of the book comprises the following chapters:

• Chapter 11, Deploying DHCP in OPNsense
• Chapter 12, DNS Services
• Chapter 13, Web Proxy
• Chapter 14, Captive Portal
• Chapter 15, Network Intrusion (Detection and Prevention) System
• Chapter 16, Next-Generation Firewall with Zenarmor
• Chapter 17, Firewall High Availability
• Chapter 18, Website Protection with OPNsense
• Chapter 19, Command-Line Interface
• Chapter 20, API – Application Programming Interface