pfsync transfers state insertion, update, and deletion messages between firewalls.<br/>
Each firewall sends these messages out via multicast on a specified interface, using the PFSYNC protocol <ahref="http://www.openbsd.org/faq/pf/carp.html"target="_blank">(IP Protocol 240)</a>.
Each firewall sends these messages out via multicast on a specified interface, using the PFSYNC protocol <ahref="http://www.openbsd.org/faq/pf/carp.html"target="_blank">(IP Protocol 240)</a>.
<br/>It also listens on that interface for similar messages from other firewalls, and imports them into the local state table.
<br/>This setting should be enabled on all members of a failover group.
<divclass="well well-sm"><b>Clicking save will force a configuration sync if it is enabled! (see Configuration Synchronization Settings below)</b></div>