What is our primary use case?
My main use case for F5 Advanced WAF is to protect applications and support application delivery, and sometimes we use LTM for load balancing.
A specific scenario where I used F5 Advanced WAF for application delivery was in our banking environment called IDFC First Bank, where we had a critical internet-facing web application used by internet teams and partners that handled sensitive data, and both security and performance were equally important. The application was exposed to the internet and started receiving SQL injections and cross-site attempts, along with automated bot traffic hitting login and search pages. Simultaneously, the traffic load increased, causing slow response times during peak hours, resulting in uneven traffic distribution to the backend servers. We configured the virtual server and pool on F5, enabled health monitors to ensure traffic was sent only to healthy backend servers, and used a load balancing algorithm to distribute traffic. The result was improved application availability, faster response times, and no single backend server overload.
This scenario stands out because it clearly shows how F5 LTM and WAF work together, with LTM focusing on availability and performance, while WAF focuses on security and threat protections, delivering a secure application delivery. The final outcome was that LTM ensures smooth and optimized traffic flow, and F5 Advanced WAF ensures strong application security, keeping the application stable, fast, and secure even during high traffic. It worked reliably in production with 2,000 or more users.
What is most valuable?
From my hands-on experience with F5 Advanced WAF in the banking production environment, some of the best features that really stand out are those that help reduce risk without breaking applications. One major strength is its Behavioral and Automatic Learning capabilities, which allow the WAF to understand normal application behavior and help create policies based on real traffic, minimizing manual effort and false positives. Another notable feature is the Advanced Attack Signature database that is very strong and regularly updated, effectively blocking SQL injections, cross-site scripting, command injections, and file inclusion attacks while allowing selective enabling or disabling of signatures to avoid blocking genuine traffic. Additionally, the Bot Protection feature is critical for the login page and API, helping stop automated login attempts, control scraping, and manage abnormal request rates, which ultimately reduces unnecessary loads on the backend server and improves overall stability. Finally, the strong visibility and logging properties provide detailed event logging and reporting, allowing the security team to see which attacks were blocked, which parameters or URLs triggered them, and source behavior patterns.
In my day-to-day activities, if I had to pick one feature I rely on the most within F5 Advanced WAF, it would be the Behavioral Learning with policy tuning, as the biggest challenge in application security, especially in the banking sector, is avoiding false positives. Applications frequently change, new parameters are added, and user behavior can evolve. This feature allows me to review newly learned parameter URLs and fine-tune enforcement so genuine users are not impacted, confidently moving policies from staging to blocking mode, saving significant time and preventing unnecessary production issues. In a large environment, security teams cannot manually write rules for everything, so this learning engine provides a baseline, allowing us to apply engineering judgment on top of it, which makes F5 Advanced WAF usable in real life. From a daily operation point of view, F5 Advanced WAF stands out because it is practical, stable, and predictable once properly tuned, which is exactly what you want in a critical enterprise environment.
F5 Advanced WAF has a clear and measurable positive impact in our organization, particularly regarding our security posture, application stability, and operational efficiency. After implementing F5 Advanced WAF, we saw a significant reduction in web-based attacks such as SQL injection, cross-site scripting, and automated malicious traffic, allowing us to block real threats before they reached the backend server. With proper use of behavioral learning and tuning, false positives are greatly reduced, leading to minimal impact on genuine users and fewer application outages caused by security controls. This created higher confidence when running the policy in blocking mode, which was a big win for both the application and security team. Strong visibility and faster incident response through detailed logging and reporting help our team quickly identify patterns, perform faster root cause analyses, and support audit and compliance requirements, ultimately reducing investigation time and improving overall response efficiency.
After implementing F5 Advanced WAF in the enterprise banking environment, we saw measurable improvements across security and operations, including reduced web attacks, decreased false positives over time, improved application stability, faster incident response investigations, and operational efficiencies.
What needs improvement?
F5 Advanced WAF performs well overall, but I have noticed some points that could enhance the solution. Initially, policy tuning could be simpler, as while the learning engine is powerful, initial tuning still requires experienced engineers, which can be challenging for new teams due to the complexity of options and parameters. A more guided and simple tuning workflow would help reduce the learning curve. Additionally, tighter native integration with SIEM or SOAR tools would simplify correlation and investigations for security teams, although log exports are available. Overall, these are not blockers, merely enhancement opportunities, and once tuned, F5 Advanced WAF is very stable and reliable; improving usability, reporting, and onboarding would make it even more effective for larger environments.
For how long have I used the solution?
I have been using F5 Advanced WAF for more than four years; I can say I have 4.5 years of experience in WAF implementations such as F5.
What do I think about the stability of the solution?
F5 Advanced WAF has been very reliable and consistent for us; in our on-premise enterprise setup, it has been stable and predictable in day-to-day operations without any unexpected crashes or WAF-related downtime in production. It runs on F5 BIG-IP and is truly integrated with F5 LTM, providing strong stability once deployed in proper high availability. After initial tuning, it continues to run smoothly even during high traffic periods.
Which solution did I use previously and why did I switch?
We did not previously use a different solution; this is the first project for our organization.
What was our ROI?
We have seen a clear return on investment after deploying F5 Advanced WAF, primarily in terms of time and risk reduction. Time savings in daily operations come from the automatic learning and signature update reducing the need for constant manual rule management, allowing the security and network teams to spend significantly less time handling false positive application-related escalations. Incident investigation time was reduced because logs clearly indicate what was blocked and why, leading to faster resolution and more efficient use of existing engineers. A large volume of malicious traffic was blocked at the WAF layer, preventing issues from reaching the backend servers, which reduced emergency troubleshooting and application team involvement, ultimately lowering operational stress and incident cost savings without requiring additional security tools. This saved costs on hardware, licensing, integrations, and support effects, with the realistic ROI summarized as time saved in tuning, troubleshooting, and investigation, reduced risk of security incidents in a regulated environment, and improved operational efficiency by consolidating security and load balancing.
What's my experience with pricing, setup cost, and licensing?
F5 Advanced WAF is on the higher side in terms of pricing, which is justified for enterprise and banking environments, although it is premium compared to many others, especially when bundled with LTM and additional features. For organizations that already use the F5 ecosystem, the value makes sense since you get security and application delivery on the same platform. The initial setup cost is moderate to high, mainly due to the application or platform costs, licensing, and the skilled engineers required for deployment and tuning—it is not a plug-and-play solution. Licensing is capacity-driven, so you need careful planning based on traffic volume and use cases, and adding features such as Bot Protection impacts costs; once licensing is clear and sized correctly, there are no surprises. Overall, while not inexpensive, it is enterprise-grade and well-suited for large environments with critical applications, delivering solid ROI over time, particularly in banking and regulated enterprises.
Which other solutions did I evaluate?
Before choosing F5 Advanced WAF, we evaluated other options such as Akamai, which is a cloud-based solution and not recommended for critical data in a cloud environment since it does not provide an on-premise solution.
What other advice do I have?
If someone is looking into using F5 Advanced WAF, my advice is to spend time on learning and tuning, and do not rely on blocking mode on day one; it is essential to run the application in learning mode, understand traffic patterns, and tune policies properly to avoid false positives in production. Also, it depends on size and platform; while F5 Advanced WAF scales well, correct sizing of hardware and licensing based on traffic volume is crucial. Proper capacity planning upfront saves performance issues later, and having skilled resources is important; this is an enterprise-grade solution, not plug-and-play, so ensure you have experienced F5 engineers or proper training during initial deployment and tuning. F5 Advanced WAF is an excellent choice for large enterprises and regulated environments, but success depends on proper design, tuning, and ongoing review; when implemented correctly, it delivers strong security with stable performance.
Overall, F5 Advanced WAF is a strong, dependable enterprise solution that works best when seen as a long-term security platform rather than a quick add-on; once properly designed, sized, and tuned, it runs quietly in the background and effectively does its job without constant attention. It has met our expectations and proven to be a reliable choice for protecting business-critical applications. I have provided an overall review rating of eight out of ten for F5 Advanced WAF.
Which deployment model are you using for this solution?
On-premises