Product ManualXG-7100-1U
6. Configure the DHCP server for the new subnet, utilizing the CARP VIP for DNS and Gateway roles (Optional,
Primary node only)
2.3 Components of a High Availability Cluster
Though often erroneously called a “CARP Cluster”, two or more redundant pfSense firewalls are more aptly titled a
“High Availability Cluster”, since CARP is only one of several technologies used to achieve High Availability with
pfSense.
The most common High Availability cluster configuration includes only two nodes. It is possible to have more nodes
in a cluster, but they do not provide a significant advantage. This guide assumes two SG-4860 nodes are in use, one
acting as the primary node and the other as the secondary node.
Fig. 7: Example High Availability Cluster
2.3.1 IP Address Redundancy (CARP)
For connectivity through a cluster to continue seamlessly during failover, traffic to and from the cluster must use
redundant IP addresses. In pfSense, Common Address Redundancy Protocol (CARP) is used for this task.
2.3. Components of a High Availability Cluster 58
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