How to Choose the Right DDoS Attack Prevention

For DDoS attack prevention, rather than relying on a single security setting, you need to assess which layer the traffic is targeting and whether the protection stops the attack before it reaches the server. A CDN and web application firewall may be sufficient for a small website, while large-volume attacks directed at the IP address require network-level filtering and provider intervention.

Define DDoS attack prevention according to the attack layer

DDoS is a general term for attacks that attempt to consume service capacity with requests or packets from many sources. However, not all attacks occur in the same way. Attacks at the network and transport layers can strain connection capacity, packet-processing resources, or TCP connection tables. Application-layer attacks, on the other hand, can resemble normal HTTP requests while repeatedly performing expensive operations such as login, search, or product-page requests.

When making a decision, first identify the attack symptom. If the internet connection is becoming saturated, several services are becoming inaccessible at the same time, or traffic directed at the server is growing unusually large, network-level protection should be the priority. If only certain URLs are slowing down, web-server CPU usage is increasing, and the requests resemble valid browser traffic, application-layer controls such as rate limiting, WAF rules, and caching are more appropriate. In the first case, a CDN alone may not be sufficient; in the second, simply providing high bandwidth may not prevent the attack from consuming application resources.

The difference between a CDN, WAF, and network scrubbing

A CDN can reduce the number of requests reaching your origin server by serving content from locations close to users. A WAF examines the structure of HTTP requests and helps block requests that do not comply with specific rules or that display unusual behavior. A network scrubbing service analyzes traffic before it reaches your data center and aims to forward suitable packets to your server. Because the scope of these services varies by provider and plan, you also need to verify which layers are included in the statement “DDoS protection is available.”

Choose the right solution for your hosting type

With shared hosting, users generally cannot manage network devices or upstream routing. In this environment, the provider’s shared network protection, traffic-filtering policy, and handling of the account during an attack are important. If the site operates only over HTTP or HTTPS and the origin IP address is not exposed externally, CDN-based protection may be considered. However, the solution may have limited scope if the provider cannot easily conceal the origin address or if other services, such as email, run on the same IP.

A VPS or physical server provides more control; however, this does not mean that you can handle a large attack with the server’s own firewall. Once traffic reaches your connection, even packets blocked by the operating system may already have consumed bandwidth. Therefore, for attacks directed at the IP address, ask about the data center’s upstream filtering capacity, traffic-handling process, and which services can be protected. With a managed service, intervention may be handled by the provider; on an unmanaged server, you may need to design the rules and application behavior yourself.

If your application receives only web traffic and the attack is concentrated on specific endpoints, combining a WAF, bot-behavior analysis, and rate limiting is reasonable. By contrast, if you operate a game server, VPN, DNS, or custom TCP/UDP services, an HTTP-focused WAF may not protect that traffic; L3/L4 support and an explicit list of the supported protocols are required.

How should you technically evaluate a protection offer?

First, clarify how the protection is activated: Is traffic filtered automatically, or is a support request required during an attack? Automatic filtering may provide a shorter response time; however, false positives—that is, real users being blocked—depend on how the rules can be configured. If manual intervention is offered, learn not only the operating hours but also who handles the incident and through which channel.

Then compare the following items separately:

• Protected layers: This shows whether L3/L4 and L7 support is included, as well as whether TCP, UDP, or only HTTP(S) traffic is covered.
• Origin concealment: Protection behind the CDN can be bypassed if an old server IP, mail service, or directly accessible subdomain exposes the origin in addition to the DNS record.
• Rule control: This indicates who manages settings such as WAF rules, rate limits, allowlists, and emergency blocking, and at what access level.
• Evidence and notifications: You should be able to see the time, target, and classification of blocked requests so that genuine user errors are not confused with attack behavior.

Suppose a news site publishes only over HTTPS, direct access to the origin server can be disabled, and the problem occurs because of a high volume of requests to a particular search URL. In this case, a CDN cache, a WAF rate rule, and accepting origin access only from the protection layer may be an appropriate starting point. If the same site also operates a direct UDP service, however, this choice will not protect that service; separate network protection with UDP support is required.

Perform a safe evaluation before first use

Before purchasing or enabling protection, document the acceptance criteria for normal traffic: The home page and critical operations should load, requests from genuine logged-in users should not be unnecessarily blocked, and the policy for direct access to the origin server should work as expected. If you will change DNS, save the existing records and previous configuration; make one change at a time so you can distinguish which effect came from which setting.

During the initial check, compare the event time in the protection panel with your own server or application logs. If a request blocked at the protection layer does not appear in the origin log, the traffic was probably stopped before reaching the server; this may be the expected result. Conversely, if traffic marked as an attack still appears heavily in the origin log, the origin IP may have been exposed, the DNS cache may not have refreshed yet, or the rule may be in reporting-only mode. Make this distinction first, then change only the relevant setting.

After the change, repeat the same normal page and operation flow; in the event records for the new time period, check that the genuine request was accepted, that no unexpected direct request reached the origin, and that the error rate did not increase. If the problem persists, do not disable the protection entirely. Instead, roll back the last change, return to the previous value you recorded, and report which layer appears to be missing to the provider using concrete timestamps. Do not share credentials or access keys together with the logs.

As the next step, list the protocols used by your site and its origin access points, then compare them with the provider’s scope. When reviewing technical hosting options, you can also evaluate the relevant service information on İyibirNet; you still need to verify the protection scope in writing.