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The XG Series hardware appliances will reach end-of-life (EOL) on March 31, 2025. Click here to see the XG to XGS migration documentation.

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https://docs.sophos.com/nsg/sophos-firewall/21.0/Help/en-us/webhelp/onlinehelp/index.html?contextId=network-cellular-WAN-interface

Cellular WAN interface

When you turn on cellular WAN, the firewall creates the WWAN1 interface. This interface is a member of the WAN zone, and the firewall rules for the WAN zone apply to it. The firewall also creates the ##WWAN1 host. You can protect against malware attacks and unauthorized usage by specifying firewall rules and policies for the host.

  • To view the modem details and the recommended configuration, click Show recommended configuration and click Load recommended configuration to load the settings.

General settings

Name: Enter a name. You can change this name later.

Maximum number of characters: 58

The subsystems will show the customizable name and not the hardware name of the interface.

Hardware: The hardware name of the cellular WAN interface appears automatically. You can't change this name.

IP assignment: IP assignment method used by the modem.

Note

For 5G wireless modules, only the Network adapter (DHCP) method is available. Dial-up (PPP) is turned off. You can't turn it on.

Connect: Mode to use to establish a cellular WAN connection.

Reconnect tries: Number of attempts to be made when reconnecting to an access point. To provide unlimited attempts, select Always.

Modem port: Serial interface on which the modem will establish a connection.

Phone number: Phone number to use to establish the connection.

Username: User name required for the connection.

Password: Password required for the connection.

SIM card PIN code: Code required to unlock the PIN-enabled SIM card.

APN: Access point name. The APN is a configurable network identifier that identifies the Packet Data Network (PDN) or the GSM carrier with which the user wants to communicate.

DHCP connect command: DHCP command to use to connect to the cellular WAN.

DHCP disconnect command: DHCP command to use to disconnect from the cellular WAN.

Initialization string: String that enables or disables certain features on the wireless modem. Priority is assigned according to the sequence indicated.

Gateway settings

Gateway name: Name to identify the gateway.

Gateway IP: IP address of the gateway.

Other settings

Assignment type: Method to assign the values for Maximum Transmission Unit (MTU) and Maximum Segment Size (MSS). Select one of the following options:

  • Automatic: Fetches the values for MTU and MSS automatically from your ISP. This is the default option.

  • Manual: Use this option if the automatically fetched values don't work for you. Manually enter the values for the following settings:

    • MTU: Maximum Transmission Unit (MTU) value in bytes. It's the largest packet size that a network can transmit. Packets larger than the specified value are divided into smaller packets before they're sent.
    • MSS: Maximum Segment Size (MSS) in bytes. It's the amount of data that can be transmitted in a TCP packet.