The architecture
Which DDoS mitigation architecture do you actually need?
Three decisions: where filtering happens, whether mitigation is always-on or on-demand, and whether Layer 3/4 and Layer 7 are both covered. There's no single right architecture, only the right one for your traffic pattern, your risk tolerance and what you're protecting: a website, an API, or an entire ASN.
The three decisions that shape your posture
Most real attacks blend network and application layers, so DDoS protection services bought à la carte per layer tend to leave gaps.
| Choice | How it works | Best when |
|---|---|---|
| Anycast edge scrubbing | The same IP is announced from every PoP; floods are absorbed at the closest node (Cloudflare: 330+ cities, 340+ Tbps). | Default for web apps and APIs on a global network |
| Centralized scrubbing centers | Traffic is diverted via GRE tunnels to dedicated centers on detection, cleaned, then returned. | Some ISP/carrier setups: adds latency and a diversion step |
| Always-on mitigation | Every packet routes through the mitigation layer permanently: no detection lag, single-digit-ms cost. | Anything customer-facing or revenue-generating |
| On-demand mitigation | Clean traffic goes straight to origin until an attack is detected, then reroutes. | Backup capacity or a secondary carrier layer |
| Layer 3/4 + Layer 7 together | Network-edge filtering (Magic Transit, Spectrum) plus behavioral L7 analysis and rate-limiting. | Real campaigns that blend both, i.e. most of them |
Why coverage beats à la carte
- Volumetric floods, SYN floods and UDP reflection are Layer 3/4 problems, mitigated at the network edge before traffic reaches you.
- HTTP floods and bot-driven request storms look legitimate at the packet level, so they need behavioral analysis, not just packet filtering.
- Most campaigns blend both layers, sometimes at once, so a gap in either surface is a gap an attacker will find.
Providers differ mostly in where filtering happens and how fast it engages, covered just below. None is “wrong”; the right pick depends on your topology, whether you protect a web app or a whole IP range, and your latency budget. DDoS filtering is one layer of a broader application security posture, and pairing it with identity-based Zero Trust access shrinks the surface attackers can reach in the first place.
The exposure
How do you assess your current DDoS exposure?
Six checks surface most gaps: DNS coverage, origin exposure, rate-limit tuning, Layer 7 coverage, real always-on behaviour, tested failover. Most organizations don't know their real exposure until an audit forces the question. A few checks that consistently surface gaps:
DNS is unprotected
WAF and CDN sit in front of the app, but the authoritative DNS provider has no DDoS SLA of its own, a single point of failure nobody flagged.
Origin IP is exposed
If your real server IP is discoverable (old DNS records, certificate transparency logs, a misconfigured subdomain), attackers bypass your edge entirely and hit the origin directly.
Rate limiting is default, not tuned
Generic thresholds miss the patterns specific to your app. Login endpoints, checkout flows and API routes each need different limits.
No Layer 7 DDoS protection
Network-layer filtering is in place, but nothing watches for HTTP flood patterns or bot-driven request spikes that stay under volumetric thresholds.
Always-on isn't actually always-on
Some “DDoS protection” only activates above a manually configured traffic threshold, so smaller application-layer attacks slip through unfiltered.
No tested failover
Protection exists on paper, but nobody has run a controlled test to confirm mitigation actually engages within the expected time.
For a fast, concrete read on where you stand, run your setup through Metryx, Brixio's free Cloudflare configuration audit tool. It flags exposed origins, rate-limiting gaps and DNS-layer weak points, and gives you a prioritized list instead of a generic score.
Not sure what your Cloudflare setup actually covers?
Metryx audits your Cloudflare appsec configuration. It flags exposed origins, rate-limiting gaps and DNS-layer weak points, and gives you a prioritized fix list instead of a generic score.
Run an express audit- Free access, no commitment
- Read-only Cloudflare token
- No configuration required
- Downloadable audit report to share internally
- Run as many audits as you want, on as many zones as you want
The rollout
How do you roll out DDoS protection without breaking production?
In phases: log-only mode first, then migrate by traffic class, keep a rollback path live, and test with a controlled load before trusting it. Ripping out existing protection and dropping in a new architecture overnight is how outages happen. A phased rollout is slower on paper and faster in practice, because nothing breaks.
Step 1
Start in monitor mode
Deploy new rulesets and thresholds in log-only mode before anything gets blocked. Two to three weeks of real traffic tells you what “normal” actually looks like, far more reliable than a spec sheet.
Step 2
Migrate by traffic class
Move low-risk traffic first (static assets, marketing pages), confirm clean behavior, then move login, checkout and API once you trust the baseline. Not all at once.
Step 3
Keep a rollback path live
Every change, whether a new rate-limit rule, WAF ruleset or Anycast announcement, needs a tested way back. If a rule fires false positives against real customers, you revert in minutes, not hours.
Step 4
Test with a controlled load
Scheduled load tests against the new architecture, run with the team on standby, catch configuration errors before a real adversary does. Standard practice, not an optional extra.
Step 5
Monitor continuously once live
Deployment is the start, not the finish line. A rule tuned correctly in March can be blind to a new amplification vector by September. Continuous monitoring keeps protection effective past week one.
A phased rollout only works if someone owns it past go-live, which is why we run DDoS as a service: continuous mitigation operated for you, not a one-time configuration project.
The providers
How do DDoS mitigation providers differ?
Mainly where filtering happens: Cloudflare filters at the edge on every server, Akamai Prolexic diverts traffic to dedicated scrubbing centres. Same goal, different network models, and how fast it engages is the other half of the answer.
01
Cloudflare · autonomous edge
dosd daemons run independently on every server and push mitigation rules locally, without waiting for a central decision. Detection and response in roughly 3 seconds.
02
DDoS-Guard · Anycast filtering
A comparable Anycast approach: traffic filtered inline at the nearest distributed node rather than hauled to a central facility. Similar principle, different network scale.
03
Akamai Prolexic · scrubbing centers
The more traditional DDoS scrubbing service model: a smaller number of large, dedicated centers with traffic diversion on detection. Proven, just architecturally different in where filtering happens.
04
The right pick is yours
It depends on your existing topology, whether you protect a web app or an entire IP range, and the latency budget you can afford. We help you choose, not upsell a single model.
The managed service
What does managed DDoS protection cover day to day?
Magic Transit and Spectrum tuned to your traffic, a 24/7 SOC, continuous rule tuning, and a handover defined in the contract. We run Cloudflare DDoS protection as a managed service, not a one-time configuration project. In practice, that means:
Magic Transit & Spectrum
- Deployed and tuned against each client's actual network and application traffic
- Not shipped with default thresholds and left alone
- Layer 3/4 filtering before traffic ever reaches your infrastructure
24/7 SOC, follow-the-sun
- Monitoring across Luxembourg, Paris, Dubai and Singapore
- An attack at 3am in one region is triaged live by an analyst in another
- No alert sits in a queue until the next business day
Continuous rule tuning
- Attack signatures and legitimate traffic both evolve
- Rulesets reviewed on a standing cadence, not once a year
- Metryx posture reviews run on schedule to catch configuration drift
Handover defined before the incident
- Clear escalation paths built into the agreement
- Direct connection into our Emergency Response process
- The moment an alert crosses from monitored to active incident
Attack traffic of every kind hits the Cloudflare edge first, scrubbed close to the source, with Brixio operating and tuning it 24/7 on Brixio One.
This runs on Brixio's standing security posture
Cloudflare
Authorized Service Delivery Partner (ASDP)
ISO 27001:2022
certified data handling
400+
delivered projects across EMEA & APAC
4 hubs
Luxembourg · Paris · Dubai · Singapore, follow-the-sun
This sits inside our broader security practice and connects directly to Emergency Response for active incidents. Talk to an expert to size it against your own network and traffic.