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SonicOS 5.8.1 Administrator Guide
To configure this deployment, navigate to the Network > Interfaces page and click on the
configure icon for the X2 interface. On the X2 Settings page, set the IP Assignment to ‘Layer
2 Bridged Mode’ and set the Bridged To: interface to ‘X0’. Select the checkbox for Only sniff
traffic on the bridge-pair. Click OK to save and activate the change.
Next, go to the Network > Interfaces page and click on the configure icon for the X1 WAN
interface. On the X1 Settings page, assign it a unique IP address for the internal LAN segment
of your network – this may sound wrong, but this will actually be the interface from which you
manage the appliance, and it is also the interface from which the appliance sends its SNMP
traps as well as the interface from which it gets UTM signature updates. Click OK.
You must also modify the firewall rules to allow traffic from the LAN to WAN, and from the WAN
to the LAN, otherwise traffic will not pass successfully.
Connect the span/mirror switch port to X0 on the SonicWALL, not to X2 (in fact X2 isn’t plugged
in at all), and connect X1 to the internal network. Use care when programming the ports that
are spanned/mirrored to X0.