Cinterion
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LTE Terminals Hardware Interface Description
9.2 Connection Usage
101
ELSxT_HID_v04 2018-09-04
Confidential / Preliminary
Page 99 of 102
9.2.3 Security Notes
Please note that by delivery default it is possible to open a Telnet connection to LTE Terminal’s
embedded Linux system without being asked for a password. A root login password should
therefore be defined to restrict this type of access. If a root login password exists, access to the
embedded Linux system is only possible via SSH root login (using e.g., PuTTY for Windows).
9.2.4 Configure IP Address
To change the default IP address for LTE Terminal, it is necessary to access LTE Terminal’s
embedded Linux system as root user. This connection can be accomplished by Telnet (or SSH)
as described in Section 9.1.
Once connected, the IP address may be configured as follows:
• Open the file “/etc/config/network”. This file can be opened either on the embedded Linux
system by using the vi editor, or on an external PC by copying the file to the FTP directory,
transferring the file from the FTP directory to the PC, changing it using a text editor, trans-
ferring it back to the FTP directory and finally from there to its original directory. For more
information on FTP access see Section 9.2.2.
• Edit the file and adapt the line “option ipaddr 192.168.1.1” to for instance “option ipaddr
192.168.2.1”.
• Commit the new IP address by entering “/etc/init.d/network restart”. After the restart, the
system can be reached via the new IP address.
9.2.5 Edit APN List
Using the APN list, LTE Terminal determines the applicable APN for the inserted SIM card. The
APN list matches the unique mobile country and mobile network codes read from the SIM card
to the available APNs. By default, the APN list already comprises a comprehensive number of
the most commonly used APNs.
However, it may become necessary to add a particular APN, or to remove unnecessary APNs.
To do so, please complete the following steps:
• Open the file “/etc/apnlist”. This file can be opened either on the embedded Linux system
by using the vi editor, or on an external PC by copying the file to an FTP directory, transfer-
ring the file from the FTP directory to the PC, changing it using a text editor, transferring it
back to the FTP directory and finally from there to its original directory. For more information
on FTP access see Section 9.2.2.
The file “apnlist” contains one APN per line using the syntax:
<3-digit MCC><2-digit MNC> <access point name>
• Edit the file by adding, changing or removing APNs.
• Save the file. The adapted APN list is available as soon as it is saved.
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