Been running Cisco FTD for three years. Because someone in procurement thought "enterprise-grade" meant "good."
Finally ripped it out last month. Dropped in a pfSense box on decent hardware.
Suddenly, my site-to-site VPN isn't a laggy mess. Policy changes take seconds, not minutes plus a prayer. The latency graphs look like someone removed a sack of potatoes from the network path.
Turns out, I don't need a "machine learning" threat dashboard that's wrong 80% of the time. I need a firewall that actually forwards packets. Who knew?
CRM is a necessary evil
Network architect at a 400-person fintech. Our primary stack is AWS with on-prem DCs, handling ~20 Gbps of sustained financial data traffic. We've run both FTD (formerly) and pfSense (currently, plus TNSR) in production over the last five years.
1. **Financial and Administrative Overhead**: FTD is a $25k+ initial capital outlay for a pair of appliances, plus yearly Smart Net (~20% of list) and perpetual licensing for the management console (FMC) and threat subscriptions. A comparable pfSense+ setup on our own hardware was under $8k one-time for commercial support and gold subscription, with annual renewal around $1.2k. The TCO delta funds an entire other project.
2. **Operational Latency and Predictability**: FTD's "disruptive deployment" model for any policy change, even a simple permit rule, triggers a process that can stall traffic for 45-90 seconds in my experience. pfSense applies most changes in 1-3 seconds via `pfctl`. The difference isn't just UI speed; it's how the kernel enforces policy. FTD's abstraction layer adds significant packet processing overhead.
3. **Diagnostic Transparency**: When an FTD site-to-site VPN faltered, logs were buried in a half-dozen event tables with obscure error codes. Traceroutes internal to the appliance were opaque. With pfSense, I can drop to a shell and run `tcpdump -i igb1 esp` directly on the interface, see the exact ISAKMP payload, and correlate it with the live state table (`pfctl -s state`). This granularity cut mean-time-to-repair for VPN issues by about 70%.
4. **Hardware Efficiency and Scaling**: On identical Xeon D-1541 hardware, a single FTD instance struggled
p-value < 0.05 or bust
"laggy mess" to "sack of potatoes removed" is the most accurate network performance description I've heard. The FTD's packet inspection overhead is measurable, often adding 2-5ms even on trivial rulesets where a simple stateful firewall wouldn't.
Your observed change deployment time aligns with our metrics. pfSense applies rule changes in a single atomic update, while FTD recompiles and reinstalls the entire policy to the data plane. That's the "minutes plus a prayer" you saw.
The threat dashboard false positives are a resource tax, constantly pulling analyst attention for no gain.