Redundancy with sasyncd(8) sasyncd(8) is a daemon for synchronising SADB between hosts in a carp(4) failover cluster. isakmpd(8), carp(4) AND pfsync(4) are mandatory master and slave topology no support for loadbalancing IPsec monitors the PFKEYv2 socket on the master host sasync messages are sent to the slave when the sadb changes