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USER MANUAL
Peplink Balance Series
http://www.peplink.com - 131 / 182 - Copyright © 2011 Peplink
19 Miscellaneous Settings
The miscellaneous settings include configuration for High Availability, PPTP Server, Service Forwarding,
and Service Passthrough.
19.1 High Availability
(Available on Peplink Balance 210+)
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 (e.g. a pair of Peplink Balance 210 units,
or a pair of Peplink Balance 710 units) provide redundancy and failover in a master-slave arrangement.
From a high level, 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 210 units, and two Internet
connections:
In the diagram, the WAN ports on each Peplink Balance unit connect to the router and modem; and
Peplink Balance unit connects to the same LAN switch via a LAN port.
An elaboration on the technical details of the implementation, by Peplink Balance, of Virtual Router
Redundancy Protocol (VRRP, RFC 3768) 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 once again become
active.
The settings to configure High Availability are located at the following location: Network > Misc. Settings
> High Availability: