For most public websites, Cloudflare is the fastest way to stop a DDoS; for AWS-native apps, AWS Shield Advanced is the cleaner choice if traffic already runs through CloudFront, Route 53, Global Accelerator, or an Application Load Balancer. The right answer depends on where your users enter your infrastructure. If DNS, CDN, and web application filtering are already handled by Cloudflare, stay there. If your stack is deeply tied to AWS services, Shield Advanced gives tighter billing protection, response access, and service-level integration.
TLDR: Cloudflare is usually easier to deploy quickly because you can route traffic through its edge network, enable Under Attack Mode, and apply managed rules in minutes. AWS Shield Standard is free and always on for many AWS services, while Shield Advanced adds stronger support, cost protection, and DDoS response help. For example, a retail site receiving 80,000 requests per minute during a bot flood may block most junk traffic at Cloudflare before it reaches origin, while an AWS-hosted API behind CloudFront and WAF may respond better with Shield Advanced tied directly into AWS monitoring.
What “Stopping a DDoS” Really Means
A DDoS attack is not usually “stopped” in the movie-hacker sense. It is absorbed, filtered, rate limited, or rerouted before it crushes your servers. The goal is simple: keep real users online while bad traffic gets dropped as early as possible.
That means protection needs to happen before your origin server feels the hit. If your server is already receiving every request, you are late. Good DDoS protection sits at the edge, spreads traffic across huge networks, and decides what is garbage before your app has to care.
Cloudflare: Fast Setup and Broad Edge Protection
Cloudflare works as a reverse proxy. You point your DNS to Cloudflare, turn on the orange cloud proxy, and traffic passes through its global network before reaching your site. That alone can hide your origin IP and absorb large volumes of unwanted traffic.
Cloudflare is strong for:
- Websites and web apps that need quick protection.
- Small teams without a full security operations center.
- Layer 7 attacks, such as HTTP floods and credential stuffing.
- DNS protection and CDN caching.
- Simple emergency controls, such as Under Attack Mode.
The nice part is speed. A basic setup can be live fast if you control DNS. During an attack, you can raise the security level, challenge suspicious traffic, add rate limits, block countries if needed, and cache more aggressively. For a WordPress site, ecommerce shop, SaaS landing page, or public documentation portal, that can make a painful attack survivable.
The catch is that Cloudflare only protects what flows through it. If attackers find your origin IP and hit it directly, they can bypass the proxy. You must lock down the origin so it only accepts traffic from Cloudflare IP ranges. This step gets skipped far too often, and it can ruin an otherwise solid setup.
AWS Shield: Best When You Already Run on AWS
AWS Shield comes in two main forms: Shield Standard and Shield Advanced. Shield Standard is included at no extra cost for supported AWS services. It protects against common network and transport layer attacks. For many teams, it is quietly doing useful work in the background.
Shield Advanced is the paid option. It adds stronger detection, access to the AWS DDoS Response Team, advanced metrics, attack diagnostics, and cost protection for scaling charges caused by DDoS traffic. It works with services such as CloudFront, Route 53, Elastic Load Balancing, Global Accelerator, and Elastic IPs.
AWS Shield is strong for:
- AWS-heavy systems already using CloudFront and load balancers.
- APIs that need AWS WAF rules close to the app stack.
- Enterprises needing direct response support during major attacks.
- Teams worried about surprise cloud bills during traffic floods.
- Infrastructure teams that prefer one cloud console and one vendor path.
Honestly, it feels like AWS makes you click through three places when one would do. Shield, WAF, CloudWatch, CloudFront, and load balancer settings can feel scattered. Still, once configured well, the setup is powerful and very reliable.
Cloudflare vs AWS Shield: Key Differences
| Category | Cloudflare | AWS Shield |
|---|---|---|
| Best fit | Public websites, SaaS, ecommerce, DNS/CDN protection | AWS-hosted apps, APIs, enterprise cloud workloads |
| Setup speed | Often faster through DNS changes | Easy if already on AWS, slower if architecture is complex |
| Layer 7 filtering | Strong WAF, bot tools, rate limiting | Strong with AWS WAF and CloudFront |
| Emergency mode | Very simple controls | More structured, more configuration-driven |
| Cost concern | Plans vary by features and traffic needs | Shield Advanced has a fixed monthly fee plus AWS service costs |
How to Stop a DDoS with Cloudflare
If you are under attack and Cloudflare is already active, start with the fastest controls first:
- Enable Under Attack Mode. This adds browser checks before users reach your site.
- Increase security level for suspicious regions or paths.
- Turn on managed WAF rules for known attack patterns.
- Add rate limiting for login pages, search, checkout, and API endpoints.
- Cache static pages where possible to reduce origin load.
- Block direct origin access by allowing only Cloudflare IP ranges.
For example, if /login jumps from 200 requests per minute to 20,000, rate limit that path. Challenge strange user agents. Block repeated failed attempts. Keep real customers moving while the flood burns itself out.
How to Stop a DDoS with AWS Shield
With AWS, the best defense starts before the attack. Place public apps behind CloudFront, use Route 53 for DNS, connect AWS WAF, and avoid exposing origin resources directly to the internet.
During an attack:
- Check CloudWatch metrics for spikes in requests, packets, errors, and latency.
- Review Shield events to see attack type and target.
- Use AWS WAF rules to block IPs, countries, headers, paths, or request patterns.
- Apply rate-based rules to slow repeat offenders.
- Contact the AWS DDoS Response Team if you have Shield Advanced.
- Keep origins private behind CloudFront, security groups, and access controls.
Shield Advanced is especially useful when traffic spikes could trigger painful scaling costs. If an attack causes extra load balancer, data transfer, or autoscaling charges, AWS may provide DDoS cost protection for eligible protected resources.
Which One Should You Choose?
Pick Cloudflare if you want quick protection, easier controls, and strong edge filtering for public websites. It is often the practical answer for startups, publishers, stores, agencies, and teams that need results without rebuilding infrastructure.
Pick AWS Shield Advanced if your production system already depends on AWS networking. It fits companies using CloudFront, Route 53, ALB, NLB, Global Accelerator, and AWS WAF as core pieces of the stack.
You can also use both. Many companies put Cloudflare in front for DNS, CDN, and WAF, while AWS still protects backend services. Just avoid messy overlap. Duplicate rules can cause false blocks, logging confusion, and extra troubleshooting. Nothing is more annoying than blocking a real customer twice and still letting the bot through.
Practical Recommendation
If you need protection this week, start with Cloudflare and lock down the origin. If you are building a serious AWS-hosted platform, use CloudFront, AWS WAF, and consider Shield Advanced when downtime or surprise traffic bills would hurt badly.
The best DDoS plan is not a single button. It is a layered setup: edge filtering, private origins, rate limits, WAF rules, monitoring, and a response plan. Cloudflare makes that easier for broad web protection. AWS Shield makes it stronger inside AWS. Choose based on where your traffic flows before the attack starts.
