Specify the Probe Addresses of two sites (the Primary and Secondary) that the console server
is to ping to determine if the principal net wor k is still operational
In event of a failure of the principal network the 3G network connection is activated as the access
path to the console server (and its Managed Devices). Only HTTPS and SSH access is enabled
on the failover connection (which should enable the admini st rator to conne ct and fix the problem)
Note: By default, the console server supports aut omatic fail ure -recov ery back to the origi nal st at e prior
to failover .The console server contin ual ly pings probe addre sses whilst in original and failover
states. The original st ate will automat i cally be set as a priority and reestablished following three
successful pings of the probe address es during failover. The failover state will be removed once
the original state has been re-established.
For earlier firmware t hat does not support automatic fail ure-recovery, to restore networking to a
recovered state the following command then needs to be run:
rm -f /var/run/*-failed-over && config -r ipconfig
If required, you can run a custom bash script w hen the device fails ov er. I t is possible to use this
script to implement automatic failure recovery, depending on your network set up. The script to
create is:
/etc/config/scripts/interface-failover-alert
You can check the connection status by selecting the Cellular pa nel on the Status : Statistics
menu
o The Operational S tatus will change as the cellular modem finds a channel and conne ct s t o
the network
o The Failover & Out-of-Band screen will display information relating to a conf igured
Failover/OOB interface and the stat us of that connection. The I P Address of the Failover/
OOB interface will be presented in the F ailover & Out-of-Band screen once the
Failover/OOB interface has been triggered
5.7.3 Cellular routing
Once you have configured carrier connection, the cellular modem can be configured to route traff i c
through the console server. This requires setting up forwarding and masquerading - as detailed in
Chapter 5.8.
5.7.4 Cellular CSD dial-in setup
Once you have configured carrier connection, the cellular modem can be configured to receive Circuit
Switched Data (CSD) calls.
Note: CSD is a legacy form of data transmission devel oped for the TDMA based mobile phone systems
like GSM. CSD uses a single radio time slot to deliver 9.6kb/ s data transmissio n to the
GSM Network and Switching Subsystem where it could be conn ected through t he equivalent of a
normal modem to the Public S wit ched Telephone Network (PSTN) allowing direct calls to
any dial-up service. CS D is provided select i vely by carriers and it i s im portant you receive a Data
Terminating number as part of t he m obi l e service your carrier provides. This is t he num ber which
external modems will call to access the console server
Select the Cellul ar Modem panel on the System : Dial menu
Check Enable Dial-In and configure the Dial-In Settings
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