Digi ConnectPort X4 User's Guide download pdf (Page 77)

Configuration through the web interface

Secondary Destination (TCP Connection Test): The secondary, or second,

destination to which to establish a TCP connection. The Secondary TCP Port is used

as the port to which the test connects at the Secondary Destination. The destination

must be a valid IPv4 address. If the destination is left empty, no Secondary

Destination link test will be attempted.

Connection Timeout (TCP Connection Test): The time in seconds to wait for a

TCP connection to be established or rejected by the destination host.

The following four Link Test options are used if the Ping or TCP Connection Link Test is selected.

 Repeat the test every: N seconds: The time interval (N) in seconds between the end of

a successful link test and the start of the next link test for the network interface. This

interval is used only after a successful test.

Shorter intervals verify the link more often, but they also increase the packet traffic over

the network interface being tested. The frequency of tests should be considered carefully

for network connections such as Mobile (cellular) connections, which may be

expensive, depending on the service plan in effect with your mobile service provider.

 On test failure, retry every: N seconds: The time interval (N) in seconds between the

end of a failed link test and the start of the next link test for the network interface. This

interval is used after a failed test, but only until the “Not Responding” (consecutive

failures) threshold has been reached.

A possible strategy is to configure a shorter Retry interval than the Success interval, to

more quickly test the network connection to determine whether it is truly not working or

there was just a transient test failure. Determining the validity of the link helps failover

determine whether it is necessary to reconfigure the default gateway.

 Report Not Responding after: N consecutive failures: The threshold (N) in

consecutive link test failures at which time the network interface is reported to failover

as “Not Responding”. Upon receiving such a report, failover may determine that the

default gateway should be reconfigured. The count of consecutive failures is reset to

zero when a successful link test completes, or when the network interface is

reconfigured or its connection is restarted (such as a mobile PPP connection).

 When Not Responding, retry every: N seconds: The time interval (N) in seconds

between the end of a failed link test and the start of the next link test for the network

interface. This interval is used after a failed test, but only after the “Not Responding”

(consecutive failures) threshold has been reached.

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Digi ConnectPort X4 User's Guide Page 77