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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 modem

Modem interfaces are used in remote connections when your modem is directly connected to the firewall (serial port or Ethernet). The firewall accepts all modem types (ADSL, ISDN, RTC, ...).

New modem interfaces can be created thanks to the wizard. The maximum number of available modems on your firewall depends on the model.

In the menu Network\Interfaces click on Add and select “Add un modem”

## Step 1

### Identification du modem

Name | Enter a name (mandatory).
Comments | Description to identify the Dialup connection.
Color | Color assigned to the remote connection.

### Configuring the modem

Select the type of dialup from PPPoE, PPTP, PPP or 3G/4G. The configuration window varies according to the selected dialup.

PPPoE | Select the network interface used for the modem
PPTP | Enter the IP address of the modem.
PPP | Enter the telephone number used for dialing.
3G/4G | Fill in the following fields: Access point name: this information varies according to each access provider and is given to you when your 3G/4G subscription begins. Number to dial: this is the number that the modem needs to dial in order to connect to the access provider's network. The default value suggested is *99# IP address of the remote server: your access provider will give you this address. PIN code of the SIM card: information that comes together with your SIM card. USB modem: by default, the value Automatic detection will be suggested. If your modem is not automatically recognized, choose one of the two "customized modem" profiles then click on Modem configuration.
Query domain name servers and create associated host objects | If this option is selected, the firewall will retrieve DNS servers from the DHCP server it contacts (access provider, for example) to obtain its IP address. Two objects will be dynamically created in the object database upon the selection of this option: Firewall_<interface name>_dns1 and Firewall_<interface name_dns2. They can then be used in the configuration of the DHCP service. So, if the Firewall provides the users on its network with a DHCP service, the users will also benefit from the DNS servers given by the access provider.
Define the maximum size of TCP packets (MSS) to prevent them from being fragmented. This limit will be applied to all profiles. | If this option is selected, the firewall will automatically adapt the size of packets exchanged through the modem so that they will not be fragmented.

## Customized 3G/4G modem profile

If your 3G/4G modem is not automatically recognized, 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).

### Authentication

Identifier | Enter the user’s ID (mandatory).
Password | Enter the password (mandatory).

Once Step 1 has been configured, click on Next.

## Step 2

### Routing: use the gateway obtained by the modem

Select whether you wish to define the modem as a gateway.

To the list of main gateways | The host Firewall_ <name of modem>_peer will be added to the main gateways. If there is no main gateway, a window will appear asking if you wish to define a main gateway (default router).
To the list of backup gateways | The host Firewall_ <name of modem>_peer will be added to the secondary gateways.
Do not add (configure later) | The modem has not been defined as a gateway.