Configuring Two Sonicwalls To Use Layer 2 Connection with Failover

This is a summery of how you can connect a layer 2 (point to point/direct connection) between two Sonicwalls using SonicOS Enhanced 5.8.  This is also a summery of how you can use the second Sonicwall’s WAN as a failover connection for the first Sonicwall.

On the first Sonicwall, plug layer 2 connection into an interface.  For this example we will use X5.

Network->Interfaces
   
    Zone: WAN
    IP Assignment: Static
    IP Address: 10.10.10.1
    Subnetmask: 255.255.255.0
    Default Gateway: 10.10.10.2
    DNS Server 1: 208.67.222.222
    DNS Server 2: 8.8.8.8
    DNS Server 3: 208.67.222.220

On the second Sonicwall, plug layer 2 connection into an interface.  For this example we will use X5.

Network->Interfaces

    Zone: LAN
    Mode/P Assignment: Static IP Mode
    IP Assignment: 10.10.10.2
    Subnetmask: 255.255.255.0

For failover and the ability to use the second Sonicwall's WAN for the first Sonicwall's WAN...
On the first Sonicwall

Network->Failover & LB

    Check Enable Load Balancing
    Check Respond to Probes

    In the Groups section Click Configure for Default LB
        Type: Basic Failover
    Check Preemp failback to preferred interfaces when possible
    Highlight X5 interface and click Add
    Order desired interface and click OK

    Click Configure for X5
        Select Logical/Probe Monitoring enabled
        Select Probe succeeds when either Main Target or Alternate Target responds
        Main Target: Ping (ICMP) Host: 4.2.2.1
        Alternate Target: Ping (ICMP) Host: 8.8.8.8
        Default Target IP: 208.67.222.222
        Click OK
    Click Accept