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By default, most providers offer a consumer grade service, which provides dynamic private IP address assignments to 3G
devices. This IP address is not visible across the Internet, but generally, it is adequate for home and general business use.
• With such a plan, the Failover & Out-of-Band tab on the Status: Statistics will identify that your carrier has allocated
you a private IP address (i.e. in the range 10.0.0.0 – 10.255.255.255, 172.16.0.0 – 172.31.255.255 or 192.168.0.0 –
192.168.255.255).
• For inbound OOB connection, you will need to set up a VPN.
In out-of-band access mode, the internal cellular modem will continually stay connected. The alternative is to set up failover
mode on the console server (detailed in the next section).
5.7.2 Set Up Cellular Failover
In this mode, a dial-out cellular connection is only established in the event of a disruption to the main network. The cellular
connection normally remains idle in a low power state and is only activated in the event of a ping failure. Standby mode is
ideal for remote sites with expensive power or very high cellular traffic costs.
In this mode, the console server continually pings select probe addresses over the main network connection. During a ping
failure, it dials out and sets up a dial-out ppp over the cellular modem and access is switched transparently to this network
connection. When the main network connection is restored, access is switched back.
Once you have configured the carrier connection, the cellular modem can be configured for failover.
This will tell the cellular connection to remain idle in a low power state. If the primary and secondary probe addresses are not
available, it will reestablish the cellular connection and reconnect to the cellular carrier.
• Navigate to the Network Interface on the System: IP menu and specify Internal Cellular modem (cell modem 01) as
the Failover Interface to be used when a fault has been detected.
• Specify the Probe Addresses of two sites (the Primary and Secondary) that the console server is to ping to determine if
the principal network is still operational.
• In event of a failure of the principal network, the cellular network connection is activated as the access path to the console
server (and Managed Devices). Only HTTPS and SSH access is enabled on the failover connection (which should enable the
administrator to connect and fix the problem).
5. Firewall, Failover and OOB Access
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