I've been tasked with evaluating a replacement for our legacy on-prem proxy for a K-12 environment. The primary requirement is rock-solid content filtering for students, with the secondary goal of layering on zero-trust network access for staff. The two finalists are Cloudflare One's Gateway and DNSFilter. I've run both through technical proofs-of-concept, and the results are... illuminating, and not necessarily in a comforting way.
Let's cut to the chase. DNSFilter does one thing exceptionally well: DNS-layer content filtering. It's fast, the categorization is accurate, and their AI-driven pre-categorization of new domains is impressive for catching emerging threats and inappropriate content. The setup is trivial. You point your DNS resolvers to them, configure your policies, and you're largely done. For a school that just needs to stop students from accessing porn, violence, and malware on the school network, it's a near-perfect, set-and-forget solution. Their reporting is straightforward and built for this specific use case.
Cloudflare One Gateway, in contrast, is a different beast entirely. It's not a product; it's a platform. You're buying into the entire Cloudflare One suite. For content filtering, you can operate it at the same DNS layer as DNSFilter, but you can also enable their HTTP/HTTPS inspection (by deploying their root certificate on managed devices). This is where the complexity and the power both explode.
**The Good with Gateway:**
* **Depth of control:** DNS filtering is just the start. With TLS decryption, you can filter based on full URL path, specific page content, and application-level controls. Blocking a specific Google Doc or a game on a specific subdomain is trivial.
* **Integration:** If you need ZTNA (Cloudflare Access), SWG, DLP, or RBI (their remote browser isolation), it's all there, managed from the same dashboard. The policy engine is uniform.
* **Performance:** Leveraging Cloudflare's global anycast network, DNS resolution is incredibly fast.
**The Hard Truths & Pitfalls:**
* **Cost Creep:** DNSFilter's pricing is per-user, simple. Cloudflare's pricing is a labyrinth of "add-ons." You want reliable, scalable DNS filtering? That's Gateway DNS. You want HTTP/HTTPS inspection for deeper control? That's an add-on. You want the aforementioned ZTNA? That's Access, another add-on. The bill can spiral if you're not vigilant.
* **Operational Overhead:** Deploying the root certificate for TLS decryption is a major IT project for a school district. Managing exceptions, dealing with apps that use certificate pinning (which will break), and troubleshooting inspection issues adds significant ongoing overhead.
* **Reporting:** Gateway's logging and analytics are powerful but built for a network engineer or a SecOps team. Generating a simple, clean "top blocked categories for students" report is more work than it should be. DNSFilter wins on operational simplicity for reporting.
Here's a snippet of a Terraform config I used to automate part of the Gateway policy setup. It shows the power, but also the inherent complexity.
```hcl
resource "cloudflare_teams_list" "student_denied_categories" {
account_id = var.cf_account_id
name = "Student Denied Categories"
type = "SERIAL"
items = ["adult", "violence", "gambling", "malware"]
}
resource "cloudflare_teams_rule" "student_dns_policy" {
account_id = var.cf_account_id
name = "Student DNS Filtering"
description = "Blocks denied categories for student group"
precedence = 10000
action = "block"
filters = ["dns"]
traffic = "any(dns.content_categories[*] in ${cloudflare_teams_list.student_denied_categories.id})"
identity = "identity.groups.name["Students"]"
}
```
**Verdict:** If your *only* problem is content filtering on the network, DNSFilter is the superior tool. It's cheaper, more focused, and requires far less operational toil. The moment your requirements expand to include secure remote access for staff (beyond a basic VPN), detailed application control, or data loss prevention, Cloudflare One becomes the contender—but you must go in with eyes wide open about the management complexity and the real total cost of ownership. You're not just deploying a filter; you're becoming a Cloudflare network administrator.
For schools, I see a hybrid approach often being the pragmatic choice: DNSFilter for student/content safety across all devices, and a limited Cloudflare One subscription specifically for staff ZTNA to internal resources. Running both in parallel can be more cost-effective and operationally sane than trying to force Gateway to be everything.
Been there, migrated that