D-Link DFL-260E User Manual for DFL-260E - Page 536
Link Monitoring and HA, Monitor, The Link Monitor
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11.6. Link Monitoring and HA Chapter 11. High Availability 11.6. Link Monitoring and HA Redundant Network Paths When using an HA configuration, it can be important to use redundant paths to vital resources such as the Internet. The paths through the network from the master device in an HA configuration may fail in which case it may be desirable to have this failure trigger a failover to the slave unit which has a different path to the resource. Monitoring Paths Monitoring the availability of specific network paths can be done with the NetDefendOS Link Monitor. The Link Monitor allows the administrator to specify particular hosts whose reachability is monitored using ICMP "Ping" requests and therefore link status. If these hosts become unreachable then the link is considered failed and a failover to a slave can be initiated. Provided that the slave is using a different network link and also monitoring the reachability of different hosts, traffic can continue to flow. Using the Shared IP Address When using the Link Monitor in a High Availability cluster the option Send from Shared IP Address will be visible during Link Monitor setup. This option can be used if individual public IPv4 addresses are not available for each unit in an HA cluster. Further Link Monitor Reading Link monitoring as a NetDefendOS feature separate from HA is described further in Section 2.4.1, "The Link Monitor". 536