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USER MANUAL
Peplink Balance Series
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Miscellaneous Settings
The miscellaneous settings include configuration for high availability, PPTP server,
service forwarding, and service passthrough.
24.1
High Availability
The Peplink Balance supports high availability (HA) configurations via an open standard
virtual router redundancy protocol (VRRP, RFC 3768).
In an HA configuration, two same-model Peplink Balance units provide redundancy and
failover in a master-slave arrangement. In the event that the master unit is down, the
slave unit becomes active.
High availability will be disabled automatically where there is a drop-in connection
configured on a LAN bypass port.
The following diagram illustrates an HA configuration with two Peplink Balance units
and two Internet connections:
In the diagram, the WAN ports of each Peplink Balance unit connect to the router and to
the modem. Both Peplink Balance units connect to the same LAN switch via a LAN port.
An elaboration on the technical details of the implementation of virtual router
redundancy protocol (VRRP, RFC 3768) by the Balance follows:

In an HA configuration, the two Peplink Balance units communicate with each
other using VRRP over the LAN.

The two Peplink Balance units broadcast heartbeat signals to the LAN at a
frequency of one heartbeat signal per second.

In the event that no heartbeat signal from the master Peplink Balance unit is
received in 3 seconds (or longer) since the last heartbeat signal, the slave
Peplink Balance unit becomes active.

The slave Peplink Balance unit initiates the WAN connections and binds to a
previously configured LAN IP address.

At a subsequent point when the master Peplink Balance unit recovers, it will