• SonicOS 7.1
• About SonicOS
  • Working with SonicOS
  • SonicOS Workflow
  • How to Use the SonicOS Administration Guides
  • Guide Conventions
• High Availability
  • About High Availability
    • High Availability Terminology
    • High Availability Modes
    • High Availability Encryption
    • Crash Detection
    • Virtual MAC Address
    • Dynamic WAN Interfaces with PPPoE HA
    • Stateful Synchronization with DHCP
    • Stateful Synchronization with DNS Proxy
    • About HA Monitoring
  • Understanding High Availability
    • Understanding SonicWall High Availability Operation Modes
    • About Active/Standby HA
  • Benefits of Active/Standby HA
    • Working of Active/Standby HA
    • About Stateful Synchronization
    • Benefits of Stateful Synchronization
  • How Does Stateful Synchronization Work?
    • Example of Stateful Synchronization
    • Active/Standby Prerequisites
  • Supported Platforms and Licensing for HA
    • Physically Connecting Your Security Appliances
    • Maintenance
      • Removing an HA Association
      • Replacing a SonicWall Security Appliance
• Replacing an HA Primary Unit
  • Replacing an HA Secondary Unit
    • High Availability Status
    • Active/Standby High Availability Status
    • High Availability Status
• High Availability Config
  • High Availability Licenses
  • Configuring High Availability
• Configuration of HA Active/Standby
  • Configuring Active/Standby High Availability Settings
    • Configuring HA with Dynamic WAN Interfaces
    • Configuring Network DHCP and Interface Settings
    • Disabling the SonicOS DHCP Server
    • Configuring Virtual IP Addresses
    • Configuring Redundant Ports
    • Fine Tuning High Availability
    • Advanced Settings
    • Configuring Advanced High Availability Settings
    • Monitoring High Availability
    • Configuring Active/Standby High Availability Monitoring
• IPv6 High Availability Monitoring
  • IPv6 HA Monitoring Considerations
  • SonicWall Support
• About This Document
  • Configuring Active/Standby High Availability Monitoring
  • IPv6 High Availability Monitoring
  • IPv6 HA Monitoring Considerations
• Azure Use Cases
  • Use Case 1: Manage Azure HA Firewall
  • Use Case 2: Forward LAN traffic to the External Network through the Gateway after HA Failover
  • Use Case 3: Configure DNAT on Azure HA Firewall
  • Use Case 4: Configure DNAT on Azure HA Firewall (Need to move multiple floating IPs support)
• SonicWall Support
  • About This Document

Configuring HA with Dynamic WAN Interfaces

The configuration tasks on DEVICE | High Availability > Settings are performed on the Active firewall and then are automatically synchronized to the Standby firewall.

To configure HA with a dynamic WAN interface

1. Navigate to NETWORK | System > Interfaces.
2. Configure a WAN interface as PPPoE, as described in Configuring a WAN Interface in the SonicOS 7.0 Firewall Network document available at https://www.sonicwall.com/support/technical-documentation/.
3. Navigate to DEVICE | High Availability > Settings.
4. In GENERAL SETTINGS section, do the following:
   1. Select Active/Passive from the Mode drop-down field.
   2. Click OK.
   3. Ensure Enable Stateful Synchronization is not selected. This option is not selected by default and may require additional licensing.
   4. Ensure Enable Preempt Mode is not selected. This option is not selected by default.
   5. Select Enable Virtual MAC to allow the Primary and Secondary firewalls to share a single MAC address. This greatly simplifies the process of updating network ARP tables and caches when a failover occurs. This option is not selected by default.
   6. If PPPoE Unnumbered is configured, you must select Enable Virtual MAC.
   7. Only the switch to which the two firewalls are connected needs to be notified. All outside devices continue to route to the single shared MAC address.
5. Configure HA Devices and HA Interfaces options as described in Configuring Active/Standby High Availability Settings.
6. Click Accept.

7. Navigate to DEVICE | High Availability > Monitoring.

   

8. Hover over the PPPoE interface and click Edit icon.

   Interface Monitoring Settings dialog is displayed.

   

9. Enable Physical/Link Monitoring. This option is not selected by default.
10. Ensure the Primary IPv4 Address and Secondary IPv4 Address fields are set to 0.0.0.0.
11. Ensure none of the other options are selected.
12. Click OK.