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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 or modifying a loopback interface

Loopback interfaces may be used, for example, in dynamic routing configurations.

To create or modify a loopback interface, click on the “Loopback” tab.

## Button bar

Search | Search that covers interfaces.
Add | Adds an “empty” interface. An added interface (sending of a command) is effective only if its fields Name and IP address have been entered.
Delete | Deletes one or several selected interfaces. Use the keys Ctrl/Shift + Delete to delete several interfaces.
Check usage | Represented by the icon , this button indicates whether the selected interface is being used elsewhere in the configuration.

Apply | Sends the configuration of the IPsec interfaces.
Cancel | Cancels the configuration of the IPsec interfaces.

## Interactive features

Some operations listed in the taskbar can be performed by right-clicking on the table of loopback interfaces:

- Add,
- Delete,
- Check usage.

## Presentation of the table

The table sets out four fields of information:

Status | Status of the interfaces: Enabled: Double-click to enable the created interface. Disabled: The interface is not in operation. The line will be grayed out in order to reflect this.
Name(mandatory) | Give the loopback interface a name.
IPv4 address (mandatory), | Enter the IP address assigned to the loopback interface created.
Comments(optional) | Any text.