CARP sends advertisements using multicast by default, but can be configured to use unicast advertisements to a specific peer via the peer and peer6 parameters.

Why unicast ? Using CARP in unicast mode can be appropriate in a two-router topology, as communication only needs to occur between 2 specific peers and also multicast support is often filtered, limited, and so unreliable.

Steps :

• 1. Add the parameter "peer" manually
• 2. Verify CARP peer communication
• 3. Automate the peer configuration with Salt
• 4. Verify CARP peer communication