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High Availability

This document covers configuration of a High Availability cluster in pfSense® software using the following features:

  • CARP for IP address redundancy

  • XMLRPC for configuration synchronization

  • pfsync for state table synchronization

With this configuration, two units act as an “active/passive” cluster with the primary node working as the master unit and the secondary node in a backup role, taking over as needed if the primary node fails.