Summary
In this chapter, you learned how OPNsense implements high availability to guarantee enterprise-grade availability as a firewall solution. We explored how the CARP protocol provides a cluster virtual IP operation and that when combined with pfsync, XMLRPC brings a complete stack for a firewall high availability cluster. Now, you can build solid and highly available firewall clusters using OPNsense that can survive a hardware failure and keep the networks safe and protected. In the next chapter, we will learn how to protect websites and web applications using OPNsense.
