both cluster units.
Command-Line Interface
gw-world:/> set HighAvailability Sync=Yes
Web Interface
1. Go to: System > Device > High Availability
2. Enable the option: Synchronize Configuration
3. Click OK
Load Sharing
D-Link HA clusters do not provide a load sharing capability since only one unit will be active
while the other is inactive and only two NetDefend Firewalls, the master and the slave, can exist
in a single cluster. The only processing role that the inactive unit plays is to replicate the state of
the active unit and to take over all traffic processing if it detects the active unit is not responding.
Extending Redundancy
Implementing an HA Cluster will eliminate one of the points of failure in a network. Routers,
switches and Internet connections can remain as potential points of failure and redundancy for
these should also be considered.
Protecting Against Network Failures Using HA and Link Monitor
The NetDefendOS Link Monitor feature can be used to check connection with a host so that when
it is no longer reachable an HA failover is initiated to a peer which has a different connection to
the host. This technique is a useful extension to normal HA usage which provides protection
against network failures between a single NetDefend Firewall and hosts. This technique is
described further in Section 2.4.2, “The Link Monitor”.
Chapter 11: High Availability
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