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Routing Internet traffic through a remote SonicWall device which is in another network

10/14/2021 89 People found this article helpful 128,512 Views

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    Description

    Image

    There are two SonicWalls, Site A and Site B.

    • Site A and Site B are connected by using a point to point link layer 2 device.
    • Site A's X5 Interface was assigned to the LAN Zone, which means that by default Site B has access to Site A's LAN .
    • There is no existing VPN between Site A and Site B.
    • The Internet traffic from the Site B network has to go through the Site A SonicWall.
    • If the point to point link to Site A goes down then the Site B network will access the Internet through the local Site B DSL line

     

    Site A

     

    • LAN IP is: 10.29.1.1
    • WAN IP is : 72.35.91.2
    • X5 Interface IP is: 10.33.1.2

     

     

    Site B

     

    • LAN IP is : 192.168.168.168
    • WAN IP is: 12.12.12.12
    • X5 Interface IP is: 10.33.1.1

    Resolution

     

    Resolution for SonicOS 6.5

    This release includes significant user interface changes and many new features that are different from the SonicOS 6.2 and earlier firmware. The below resolution is for customers using SonicOS 6.5 firmware.

    On Site B SonicWall

    •   Create a route by navigating to Manage | Network | Routing. This is to introduce that the gateway for the Site B Network is another device.

      Source: LAN Subnets or Firewalled Subnets 
      Destination: Any 
      Service : Any  
      Gateway: 10.33.1.2  (X5 Interface IP of Site A since point to point connection is through X5 Interfaces of both devices) 
      Interface: X5
      Enable the option which says Disable route when the interface is disconnected
       Image

     

     On Site A SonicWall 

    •  Create a route by navigating to Manage | Network | Routing. This is for the return traffic destined for Site B.

      Source: Any
      Destination: Site B Network (192.168.168.0/24)
      Service: Any 
      Gateway: 10.33.1.1 (X5 Interface IP for Site B) 
      Interface: X5
       Image

    • Create a NAT Policy by navigating to Manage | Rules | NAT Policies. This is to allow the Site B traffic Internet access. 

      Original Source: Site B Network (192.168.168.0/24) 
      Translated Source: WAN Primary IP or X1 IP 
      Original Destination: Any 
      Translated Destination: Original
      Original Service: Any 
      Translated Service: Original
      Inbound Interface: Any 
      Outbound Interface: Any
       Image

     

    Testing: Go to whatismyip.com on a computer behind Site B. It should return the WAN IP of site A.




    Resolution for SonicOS 6.2 and Below

    The below resolution is for customers using SonicOS 6.2 and earlier firmware. For firewalls that are generation 6 and newer we suggest to upgrade to the latest general release of SonicOS 6.5 firmware.

    On Site B SonicWall

    •  Create a route. This is to introduce that the gateway for the Site B Network is another device. 

      Source: LAN Subnets or Firewalled Subnets 
      Destination: Any 
      Service : Any 
      Gateway: 10.33.1.2  (X5 Interface IP of Site A since point to point connection is through X5 Interfaces of both devices) 
      Interface: X5 
      Enable the option which says Disable route when the interface is disconnected
       Image

     

    On Site A SonicWall 

    •  Create a route. This is for the return traffic destined for Site B.

      Source: Any
      Destination: Site B Network (192.168.168.0/24) 
      Service: Any 
      Gateway: 10.33.1.1 (X5 Interface IP for Site B)
      Interface: X5
       Image

    • Create a NAT Policy. This is to allow the Site B traffic Internet access. 

      Original Source: Site B Network (192.168.168.0/24) 
      Translated Source: WAN Primary IP or X1 IP 
      Original Destination: Any 
      Translated Destination: Original
      Original Service: Any 
      Translated Service: Original
      Inbound Interface: Any 
      Outbound Interface: Any
       Image

     

    Testing: Go to whatismyip.com on a computer behind Site B. It should return the WAN IP of site A.

    Related Articles

    • How can I enable multicast support?
    • Accessing resources across network using Point to Point link
    • Unable to access the junk summary URL using TCP port 10080

    Categories

    • Firewalls > NSa Series > Networking
    • Firewalls > NSv Series > Networking
    • Firewalls > TZ Series > Networking

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