5.2.6. Tunnel Interface

A tunnel interface is a virtual network adapter that can be used to create a point-to-point connection via an IP network. The following types of tunnel interfaces are supported:

  • GRE: a network packet tunneling protocol developed by Cisco Systems. Its main purpose is to encapsulate network layer packets into IP packets. The IP protocol number is 47.

  • IPIP: an IP tunneling protocol that encapsulates an IP packet into another IP packet by adding an external header that contains the Source IP (tunnel entry point) and Destination IP (tunnel exit point).

  • VXLAN: a protocol for tunneling Layer 2 Ethernet frames into UDP packets. Uses port 4789.

To create a tunnel interface, in the Network --> Interfaces section, click Add and select Add tunnel. Provide the following settings:




Enable or disable the interface.


The interface name. Should be in the form greN, where N is the ordinal number of the tunnel interface.


Interface description.


The zone to which this interface will belong.


The tunnel's operating mode: GRE, IPIP, or VXLAN.


The MTU size for the selected interface.

Local IP

The local address of the point-to-point interface.

Remote IP

The remote address of the point-to-point interface.

Interface IP

The IP address assigned to the tunnel interface.


The VXLAN ID. Relevant only for a VXLAN tunnel.