USER MANUAL
Peplink Balance Series
http://www.peplink.com - 93 - Copyright © 2010 Peplink
17 Miscellaneous Settings
The miscellaneous settings include configuration for High Availability, PPTP Server, Service Forwarding,
and Service Passthrough.
17.1 High Availability
(This section applies only to Peplink Balance 210, 310, 380, 390, 580, 710 and 1350.)
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:
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