Interfaces WideArea Networks(WANs)
IX20 User Guide
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(config)> network interface eth1 ipv6 metric 2
(config)>
5. Save the configuration and apply the change
(config)> save
Configuration saved.
>
6. Type exit to exit the Admin CLI.
Depending on your device configuration, you may be presented with an Access selection
menu. Type quit to disconnect from the device.
The IX20 device is now configured to use the cellular modem WWAN, Modem, asits highest priority
WAN, and its Ethernet WAN, ETH1, as itssecondary WAN.
WAN/WWAN failover
If a connection to a WAN interface is lost for any reason, the IX20 device will immediately fail over to
the next WAN or WWAN interface, based on WAN priority. See Configure WAN/WWAN priority and
default route metricsfor more information about WAN priority.
Active vs. passive failure detection
There are two ways to detect WAN or WWAN failure: active detection and passive detection.
n
Activedetection usesDigi SureLink
TM
technology to send probetests to a target host or to test
the statusof the interface. The WAN/WWAN is considered to be down if there are no responses
for a configured amount of time. See Configure SureLink activerecovery to detect WAN/WWAN
failuresfor more information about activefailure detection.
n
Passive detection involvesdetecting the WAN going down by monitoring its link statusby some
meansother than active detection. For example, if an Ethernet cable is disconnected or the
state of a cellular interfacechanges from on to off, the WAN is down.
Default Digi SureLink configuration
Surelink is enabled by default for IPv4 on all WAN and WWAN interfaces, and isconfigured to perform
two tests on these interfaces:
n
Interfaceconnectivity.
n
DNSquery to the DNSservers for interface's the network connection.
DNSservers are typically received as part of the interface's DHCPclient connection, although
you can manually configure the DNSservers that will be used by SureLink.
Note If your device isoperating on a private APN or on wired network with firewall restrictions,
ensure that the DNSservers on your private network allow DNSlookupsfor
https://remotemanager.digi.com; otherwise, the SureLink DNSquery test will fail and the IX20
device will determine that the interface is down.
By default, these testswill be performed every 15 minutes, with a response timeout of 15 seconds. If
the tests fail three consecutivetimes, the device will reset the network interface to attempt to recover
the connection.
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