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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 GRETAP interface

Tunnels that use GRETAP interfaces allow encapsulating Level 2 traffic (Ethernet). They can then be used to link sites sharing the same IP address range through a bridge or to transport non-IP protocols over a bridge.

GRETAP interfaces are configured via a wizard that allows you to create the interface easily.

Click on Add and Add a GRETAP interface. The following screen appears:

### Global configuration

Name | Enter a unique name for your GRETAP interface.
Color | Color assigned to the GRETAP interface.

### Interface configuration

Create a disabled GRETAP interface | If this option is selected, the GRETAP interface will be inactive and located outside the bridges defined on the firewall. This option allows preparing a GRETAP configuration before using it in a production environment.
Use an existing bridge | A drop-down list allows selecting the bridge to which the GRETAP interface will be attached.

### Configuring the GRETAP tunnel

Tunnel source | Select the outgoing interface of traffic using the tunnel. In general, this would be the “out” interface of the bridge to which the GRETAP interface belongs.
Tunnel destination | Select the object representing the tunnel’s remote endpoint. This is a host object that presents the public IP address of the remote firewall.