• 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
    • Connecting the Active/Active DPI Interfaces for Active/Active DPI
  • 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
• Failure Monitoring
• SonicWall Support
  • About This Document

High Availability Encryption

High Availability encryption adds security to the communication between appliances in a HA pair. HA control messages between active and standby firewalls, such as heartbeats, configuration sync and HA state information, are encrypted to ensure security for inter-node communication.

This option is available in Active-Standby HA mode only and does not apply to messages exchanged for stateful synchronization even in Active-Standby mode. Discovery messages (find-peer and found-peer) are transmitted without encryption. After the discovery stage, however, all control messages are encrypted between the firewalls:

• Heartbeats
• Messages used for incremental config updates
• prefSync messages
• Various messages for sending HA commands between the firewall pair
• Firmware sync messages