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High Availability
Eliminate Single Points of FailureWhen the firewall goes down, your business goes down. GajShield offers two HA modes — Active-Active and Active-Passive — with stateful failover, automatic configuration sync, and zero human intervention required. Request a Demo Explore the Firewall |
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Two Modes
Active-Active & Active-Passive
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Failover
Stateful, Zero Intervention
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Sync
Automatic Configuration
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Reliable Infrastructure Isn't Optional
The need for efficient and dependable infrastructures has become critical for serving production systems — and demand continues to increase. Systems must handle growing load while reducing downtime and eliminating single points of failure. As a result, High Availability has gained extreme importance as a quality of infrastructure design.
High availability refers to systems that are durable and operate continuously without failure for long periods. Regardless of how reliable your software is, problems happen — bringing down applications or servers. Implementing HA reduces the impact of these events. A single point of failure is any component that, if unavailable, causes a service interruption. Anything required for proper functionality without redundancy is a single point of failure.
Choose How You Distribute the Load
GajShield supports both HA configurations — pick the one that matches your capacity planning and recovery objectives.
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ACTIVE-ACTIVE
Both Firewalls Run LiveBoth firewalls in the system — Master and Backup — are utilised simultaneously, increasing total system capacity. Traffic is load-balanced between them. If one fails, the other takes over without human intervention. Once the failed firewall is back, traffic rebalances. Best For
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ACTIVE-PASSIVE
Hot Standby on StandbyOnly one firewall is functional at a time (Master). The second (Slave) sits idle. If the Master fails, the second takes over and moves into Master state. Traffic routes through it with no impact on network performance. When the original Master returns, the second moves back to Slave — all without human intervention. Best For
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Sessions Survive The Failover Itself
GajShield's HA mechanism includes stateful failover — the firewall continues processing and forwarding session packets after a planned or unplanned outage. The process is transparent and requires no adjustment or reconfiguration of any remote peer.
GajShield also provides email alerts describing current HA status and notifications when firewalls change state from Master to Backup or vice versa — so your operations team always knows what's happening.
Five Pillars of GajShield HA
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Both HA ModesActive-Active and Active-Passive with state synchronisation. Pick the mode that matches your capacity planning and recovery objectives. |
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Stateful FailoverSessions survive failover. Connected users don't get dropped, established TCP sessions continue, and remote peers don't need reconfiguration. |
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Auto-Sync of ConfigurationEvery configuration change made on the Master Firewall automatically synchronises to the Backup — no manual replication required. |
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HA Status Email AlertsEmail alerts describe current HA status — so admins know health, sync status, and any anomalies even when nothing is failing. |
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State Change NotificationsEmail notification when firewall status changes from Master to Backup or vice versa — so failovers are never invisible to operations. |
Combine With CMS
HA Across Multiple SitesManage HA pairs across distributed branches centrally with GajShield CMS — one console, every HA pair. Explore CMS → |
Ready to Eliminate Single Points of Failure?
Talk to a GajShield expert about HA architecture for your environment. We will design the right Active-Active or Active-Passive deployment, size the appliance pair, and walk through stateful failover behaviour live.
Request a Demo See GajShield CMS See the Full Firewall