From 6 Hours to 3: Scaling High Availability Firewall Deployments

There’s a big difference between doing something once… and being able to do it consistently, faster, and with confidence.

The First Time

The first time I configured a dual-ISP high availability FortiGate deployment, it took me about 6 hours. There were a lot of moving parts: VLAN configuration, interface mapping, HA pairing, and validation steps. There were pieces that weren’t documented anywhere, so I had to figure them out as I went.

The Iteration

Fast forward to a recent day where I was assigned two HA firewall deployments back-to-back. First deployment: approximately 4.5 hours. Second deployment: approximately 3 hours. Same complexity. Less friction.

What Changed

It wasn’t just speed. It was structure. I started working directly within deployment scripts, customizing configs for site-specific needs, and building a repeatable mental model for how these systems come together.

The Hidden Challenge

One of the biggest risks wasn’t technical — it was distraction. At one point, I almost pushed a configuration to the wrong firewall. What saved the situation was a mismatch in device models, which prevented a full-site outage. That moment reinforced that precision matters more than speed.

The Outcome

• Two full HA firewall deployments completed in a single day
• Advanced configurations handled independently
• Increased confidence and efficiency in future deployments

Takeaway

The goal is to reduce time, reduce risk, and increase repeatability — that’s how you scale.