What are the different ways the heartbeat in unit failover can be configured?

This option indicates the medium through which the heartbeat packets between the two units are exchanged (failover option). Choose LAN to exchange the heartbeat packets over the eth0 interface.

Choose Serial to exchange the heartbeat packets over the Serial interface. It is necessary to have a null modem cable for connecting the serial ports between the two units.

Also, if an unused interface is not used on the FatPipe, that interface can be used to interconnect the FatPipe devices.
  For example if WAN 3/ETH3 is not used, then that interface can be selected in the unit failover portion of the GUI to be used for the heartbeat.

Orders specific to High Availability pairs now come shipped with an Eth4 additional PCI NIC specically for Unit Failover.

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