Interfaces Wide Area Networks (WANs)
Digi Connect EZ Mini User Guide
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n The type of tests to be performed:
l Ping test: Uses ICMP to determine connectivity. The default behavior is to ping the
interface gateway, which means that an initial traceroute is sent to the hostname or IP
address configured in the SureLink advanced settings, and then the first hop in that route
is used for the ping test.
l DNS test: Performs a DNS query to the named DNS server.
l HTTP test: Uses HTTP(s) GET requests to determine connectivity to the configured web
server.
l Test DNS servers configured for this interface: Tests communication with DNS servers
that are either provided by DHCP, or statically configured for this interface.
l Test the interface status: Tests the current status of the interface. The test fails if the
interface is down. Failing this test infers that all other tests fail.
l Custom test: Tests the interface with custom commands.
l TCP connection test: Tests that the interface can reach a destination port on the
configured host.
l Test another interface's status: Tests the status of another interface.
n The actions to take to recover connectivity in the event of failed tests:
l Change default gateway: Increases the interface's metric to change the default gateway.
This recovery action is enabled by default for the preconfigured WAN interface.
l Restart interfaceThis recovery action is enabled by default for the preconfigured WAN
interface.
l Reboot device.
l Execute custom Recovery commands.
l Two options also apply to every type of action:
o
Attempts: The number of attempts for this recovery action to perform, before moving to
the next recovery action.
o
Override wait interval before performing the next recovery action: The time to wait
before the next test is run. If set to the default value of 0s, the Test interval is used.
Additional configuration items
n The Test interval between connectivity tests.
n If more than one tests is configured, determine whether the interface should fail over based on
the failure of one of the tests, or all of the tests.
n The number of test that must pass before the interface is considered to be working and its
default route and DNS servers are reinstated.
n The amount of time that the device should wait for a response from an individual test before
considering it to have failed.
n Advanced configuration items:
l Delayed Start: The amount of time to wait while the device is starting before SureLink
testing begins. This setting is bypassed when the interface is determined to be up.
l Backoff interval: The time to add to the test interval when restarting the list of actions.
l Test interface gateway by pinging: Used by the Interface gateway Ping test as the
endpoint for traceroute to use to determine the interface gateway.
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