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Last update: 2022-07-07

Configure an interface

To configure an interface, do as follows:

  1. Go to Network > Interfaces.
  2. Click Menu Menu button and select Edit interface.
  3. Select a zone from the Network zone list.

    Select the zone

    When a zone is chosen, further configuration options are shown. By default, these are IPv4 options.

  4. Select how the interface IP address will be assigned.

    Method of assigning IP addresses to interfaces

    If you choose DHCP, no further configuration options are required, and you can save the configuration. See step 7.

    PPPoE connection is normally only used in the WAN zone when setting up a DSL connection to your ISP. You must enter the information provided by your ISP. See step 6.

    See the next step to set a static IP address for the interface.

  5. To assign a static IP address to the interface, enter the IP address you want to use and the network's subnet mask.

    Assign an IP address to the interface

    If you're setting up a WAN interface, you must also enter the name of your gateway and its IP address.

  6. If you're configuring a PPPoE interface, you must enter the following information as provided by your ISP.

    Configuring PPPoE

    Option Description
    Preferred IP Preferred IP address for the PPPoE connection. Many internet service providers assign a static IP address to PPPoE connections. Sophos Firewall allows you to bind the static IP address to the PPPoE connection.

    Depending on the PPPoE server configuration, an IP address other than the preferred IP address may be assigned to the PPPoE connection.

    Gateway name The name of the gateway through which you want to route the internet traffic.
    Username PPPoE account username.
    Password PPPoE account password.
    Access concentrator/service name Access concentrator and service name. The firewall starts only those sessions with the access concentrator that can provide the specified service.
    LCP echo interval Time, in seconds, that the system must wait before sending an echo request to check whether the link is live. Once an attempt is made, the firewall waits for the defined time interval before the next attempt is made.
    LCP failure Number of attempts (echo requests) to be made. When the specified number of attempts have been made without receiving a response from the endpoint, the firewall disconnects the PPPoE connection.
    Schedule time for reconnect The IP address assigned to a PPPoE connection, whether dynamic or static (preferred), can have a predefined validity period. When the period expires, the PPPoE connection is closed and reconnected. To prevent reconnection during working hours, turn on the PPPoE reconnect schedule.

    On reconnection, an address other than the preferred IP address (if specified) may be assigned to the PPPoE connection.

  7. Click Save.