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5. Firewall, Failover and OOB Access
Advanced users may also control multi-carrier features from the CLI:
• Show currently selected carrier:
cellctl -is | egrep “^preferred-carrier” | cut -d “ “ -f 2
• Show current modem firmware version:
cellctl -is | egrep “^current-firmware” | cut -d “ “ -f 2
• List available carriers supported on installed modem:
/etc/scripts/cell-fw-update -l
• Check for availability of firmware updates:
/etc/scripts/cell-fw-update -u
Output is the remote fingerprint followed by the list of actions that would be taken by cell-fw-update -d.
• Download latest firmware for all carriers supported by the modem:
/etc/scripts/cell-fw-update -d
Also specify -v to show verbose download progress.
• Flash modem with latest local firmware for carrier:
/etc/scripts/cell-fw-update -c <carrier>
where <carrier> is one of the carrier identifiers emitted by cell-fw-update -l. This command can be used to switch carriers or
to update the firmware of the current carrier. If the firmware version information on the modem is identical, the modem may
reject the update without error.
5.7 Cellular Operation
The cellular modem can be set up to connect to the carrier in:
• Cellular router mode. In this mode, the dial-out connection to the carrier cellular network is always on, and IP traffic is
routed between the cellular connected network and the console server’s local network ports. This is the default mode of
operation.
• OOB mode. In this mode, the dial-out connection to the carrier’s cellular network is always on and awaiting incoming
access from a remote site to the console server or attached serial consoles/network hosts.
• Failover mode. In this mode, a dial-out cellular connection is established only in the event of a ping failure.
• Circuit Switched Data (CSD) mode. In this dial-in mode the cellular modem can receive incoming calls from remote
modems who dial a special Data Terminating number. This is a 3G mode only.
5.7.1 Set Up OOB Access
In this mode, the dial-out connection to the carrier cellular network is always on and awaiting any incoming traffic. By default,
the only traffic enabled is incoming SSH access to the console server, its serial ports, and incoming HTTPS access to the
console server. There is a low level of management traffic going over the cellular network. Generally, the status reports and
alerts from the site can be carried over the main network.
This mode is typically used for out-of-band (OOB) access to remote sites. To directly access the Tripp Lite console server, a
public IP address is needed and must not have SSH access firewalled. This OOB mode is the default for Tripp Lite console
servers with internal cellular modems. OOB access is enabled by default and the cellular modem connection is always on.
For direct access, the console server needs to have a public IP address and must not have SSH access firewalled.
Almost all carriers offer corporate mobile data service/plans with a public (static or dynamic) IP address. These plans often
have a service fee attached.
• If you have a static public IP address plan, you can also try accessing the console server using the public IP address provided
by the carrier. By default, only HTTPS and SSH access is enabled on the OOB connection so you can browse to the console
server, but you cannot ping it.
• If you have a dynamic public IP address plan, a DDNS service will need to be configured to enable the remote administrator to
initiate incoming access. Once this is done, you can also try accessing the console server using the allocated domain name.
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