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Configuring Packet Mirroring

03/26/2020 65 People found this article helpful 99,409 Views

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    Description

    Configuring Packet Mirroring

    Resolution

    Firmware/Software Version: SonicOS Enhanced 5.6.x and above

    Services: Packet Mirroring


    Feature/Application:

    Packet mirroring is the process of sending a copy of packets seen on one interface to another interface or to a remote SonicWall appliance. This KB article describes how to configure Packet Mirroring either locally or between two SonicWall UTM appliances.
     


    Procedure:

    Remote Mirroring

    This section describes how to configure Packet Mirroring between two SonicWall UTM appliances with the following configuration:

    TZ 210
    X1 (WAN) Interface IP: 172.27.61.115

    NSA 4500
    X1 (WAN) Interface IP: 192.168.170.51


    The requirement is to send packets from the TZ 210 to the NSA 4500.

    • Login to the TZ 210 SonicWall management GUI
    • Navigate to the System > Packet Monitor page.
    • Click on Configure to open the Packet Monitor Configuration window.
    • Click on the Mirror tab.
    • Under Remote Mirror Settings (Sender) > Mirror filtered packets to remote SonicWall firewall (IP Address) enter the X1 (WAN) interface IP of the remote NSA 4500. In a Site-to-Site VPN between these devices, the IP address could be the LAN interface IP.
    • Click on OK to save the settings.
    • Click on the Start Mirror button on the Packet Monitor page.
    Image
     
    Image
    • Login to the NSA 4500 SonicWall management GUI
    • Navigate to the System > Packet Monitor page.
    • Click on Configure to open the Packet Monitor Configuration window.
    • Click on the Mirror tab.
    • Under Remote Mirror Settings (Receiver) > Receive mirrored packets from remote SonicWall firewall (IP Address) enter the X1 (WAN) Interface IP of the remote NSA TZ 210. In a Site-to-Site VPN between these devices the IP address could be the LAN interface IP. This is supported in NSA platforms only.
    • Click on OK to save the settings.
    • Click on the Start Mirror button on the Packet Monitor page.

     

    Image
    Image

    With the above configuration, if a capture device is connected directly to the X0 of the receiving SonicWall, all traffic flowing through the sending SonicWall can be captured. Here is a Wireshark capture of packets being received in the PC connected to the X0 of the receiving SonicWall:
     
    Image

    Local Mirroring

    Local Mirroring is useful for sending packets reaching a SonicWall to another interface of the same SonicWall. This includes remotely mirrored packets from a remote SonicWall. This is supported in NSA platforms only.
     
    Image
    • To save received packets in the local capture buffer, select the Send received remote mirrored packets to capture buffer checkbox. This option is independent of sending received packets to another interface, and both can be enabled if desired.
    With the above configuration, if a capture device is connected directly to the X2,  all traffic flowing through the SonicWall can be captured. This includes remotely mirrored packets from a remote SonicWall

    Related Articles

    • L2TP user to access the network across site to site vpn.
    • Global VPN Client slowing down the internet speed
    • App Control fails by schema error when editing VPN category

    Categories

    • Firewalls > TZ Series
    • Firewalls > SonicWall SuperMassive E10000 Series
    • Firewalls > SonicWall SuperMassive 9000 Series
    • Firewalls > SonicWall NSA Series

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