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Configuring Switching
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SonicOS 5.7: Advanced Switching Feature Guide and Screencast Tutorial
Configuring Port Mirroring
You can configure Port Mirroring on the SonicWALL NSA 2400MX to send a copy of network packets seen
on one or more switch ports (or on a VLAN) to another switch port called the mirror port. By connecting
to the mirror port, you can monitor the traffic passing through the mirrored port(s).
Figure 15 shows the Switching > Port Mirroring page with one mirror group configured. Traffic on interface
X20 is being mirrored to interface X22, the designated mirror port.
Figure 15 Switching > Port Mirroring Page
A VLAN trunk port can be mirrored, but cannot act as a mirror port itself. VLAN trunk ports are used to pass
traffic to other networking devices. By comparison, traffic arriving on a mirror port has already been handled or
sent to its destination, and the mirror port does not forward it again. Typically, the traffic is passed from the mirror
port to a computer where the administrator can use an application, such as Wireshark, to view the traffic content.
The Switching > Port Mirroring page allows the administrator to assign mirror ports to mirror ingress,
egress or bidirectional packets coming from a group of ports.
See the following procedures:
• “Configuring a Port Mirroring Group” on page 25
• “Deleting a Port Mirroring Group” on page 26
Configuring a Port Mirroring Group
To create a new port mirroring group, perform the following steps:
Step 1 On the Switching > Port Mirroring page, click the New Group button.