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IMPORTANT
SNS 3.x versions have reached End of Maintenance since July 1st, 2024.
We recommend that you update your SNS firewalls to a version with maintenance to guarantee the protection of your infrastructure.

# Creating a USB stick / modem

USB/Modem interfaces are used in remote connections when your modem is directly connected to the firewall (USB port).

Certain parameters (access point, number to dial, etc.) must be entered directly via the administration interface of the USB stick/modem.

The USB/Ethernet interface associated with the USB stick/modem is created via a wizard.

In the menu Network\Interfaces click on Add and select “Add a USB stick/modem”

### Identification of the USB stick / modem

Name | Enter a name for this modem (mandatory).
Comments | Description to identify the 4G connection.
Color | Color assigned to the remote connection.
This interface is | An interface can either be “internal (protected)” or “external (public)”. If you select “internal (protected)”, you are indicating that this interface is protected. This protection includes the memorization of machines that have logged on to this interface, conventional traffic security mechanisms (TCP) and implicit rules for services offered by the firewall such as DHCP (see the section Implicit rules). Protected interfaces are represented by a shield (). If you select “external (public)”, you are indicating that this part of the network is linked up to the internet. In most cases, the external interface, linked up to the internet, has to be in external mode. The shield icon disappears when this option is selected.

### Address range

IPv4 address | This field offers by default the value Dynamic IP (DHCP) so that the USB/Ethernet interface associated with the key automatically retrieves an IPv4 address. You can also specify the IP address and subnet mask associated with this key (e.g.: 10.10.10.10/24 or 10.10.10.10 255.255.255.0).

### Modem parameters

If your USB stick/modem is not automatically recognized (Automatic detection option), select one of the two customized profiles and fill in the following fields:

Enable: this checkbox will allow taking into account the modem's customized settings.

Name | Enter a name to identify the customized settings.
Model | Enter the model of the modem.
Vendor ID | ID specific to each modem vendor (hexadecimal string).
Initial product ID | Product ID after it has been recognized as a USB storage device. This parameter is specific to each modem model.
MessageContent for modem mode | This is a character string that allows the firewall to detect the USB device connected as a modem.
Target product ID | ID representing the product when it is in modem mode. This parameter is specific to each modem model.
Configuration command port | This is the number of the dedicated serial port for sending configuration commands ("AT" commands) to the modem. The most common value is 0.
Monitoring command port | This is the number of the dedicated serial port for sending monitoring commands ("AT" commands) to the modem. The most common value is 1.
Initialization string no. 1 | This string is optional and allows sending "AT" configuration commands to the modem before it is used. Example: "ATZ" (command to reinitialize the modem), "AT^CURC=0" (command which allows disabling periodic messages).
Initialization string no. 2 | This string is optional and allows sending "AT" configuration commands to the modem before it is used. Example: "ATZ" (command to reinitialize the modem), "AT^CURC=0" (command which allows disabling periodic messages).
Initialization string no. 3 | This string is optional and allows sending "AT" configuration commands to the modem before it is used. Example: "ATZ" (command to reinitialize the modem), "AT^CURC=0" (command which allows disabling periodic messages).