Interfaces Wide Area Networks (WANs)
IX30 User Guide
75
Configure SureLink active recovery to detect WAN/WWAN failures
Problems can occur beyond the immediate WAN/WWAN connection that prevent some IP traffic from
reaching its destination. Normally this kind of problem does not cause the IX30 device to detect that
the WAN has failed, because the connection continues to work while the core problem exists
somewhere else in the network.
Using Digi SureLink, you can configure the IX30 device to regularly probe connections through the
WAN to determine if the WAN has failed.
Required configuration items
n
Enable SureLink.
SureLink can be enabled for both IPv4 and IPv6 configurations. By default, SureLink is enabled
for IPv4 for the preconfigured WAN (ETH1) and WWAN (Modem). It is disabled for IPv6.
When SureLink is configured for Wireless WANs, SureLink tests are only run if the cellular
modem is connected and has an IP address. Use the SIM failover options to configure the IX30
device to automatically recover the modem in the event that it cannot obtain an IP address.
See Configure a Wireless Wide Area Network (WWAN) for details about SIM failover.
n
The type of probe test to be performed, one of:
l
Test another interface's status: Used to create a failover or coupled relationship between
two interfaces. Requires the name of the alternate interface, the IP version to be tested,
and the expected status of the alternate interface (either up or down).
l
Ping: Requires the hostname or IP address of the host to be pinged.
l
DNS query: You can perform a DNS query to a named DNS server, or to the DNS servers
configured for the WAN.
l
HTTP test: Requires the URLof the host to be tested.
l
Test DNS servers configured for this interface: Tests communication with this interface's
DNS servers that are either provided by DHCP, or statically configured.
l
Interface status: Determines if the interface has an IP address assigned to it, that the
physical link is up, and that a route is present to send traffic out of the network interface.
The preconfigured WAN is configured by default to use SureLink to both test the interface
status and perform a test DNS query.
Additional configuration items
n
The behavior of the IX30 device upon test failure:
l
The default behavior, which is to restart the interface and fail over to the next priority
WAN/WWAN.
l
For WWANs, SIM switching (also enabled by default).
l
For WWANs, reset the modem.
l
Reboot the device.
n
The interval between connectivity tests.
n
The number of probe attempts before the WAN is considered to have failed.
n
The amount of time that the device should wait for a response to a probe attempt before
considering it to have failed.
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