Network : Network > Interfaces : Tap Interface

Tap Interface
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You can use a tap interface to monitor traffic on a port.
To configure a tap interface, click the name of an Interface (ethernet1/1, for example) that is not configured and specify the following information.
If you want to export unidirectional IP traffic that traverses an ingress interface to a NetFlow server, select the server profile or click Netflow Profile to define a new profile (see Device > Server Profiles > NetFlow). Select None to remove the current NetFlow server assignment from the interface.
Select a security zone for the interface or click Zone to define a new zone. Select None to remove the current zone assignment from the interface.
Ethernet Interface > Advanced > Link Settings
Select the interface speed in Mbps, or select auto to have the firewall automatically determine the speed.
Select whether the interface transmission mode is full-duplex (full), half-duplex (half), or negotiated automatically (auto).
Select whether the interface status is enabled (up), disabled (down), or determined automatically (auto).
Ethernet Interface > Advanced > PoE Settings
(Supported firewalls only)
Network > Interfaces