Targeted filtering to prevent manual attacks, SQL injections, and other application-level threats.

3. WAF

Request-by-request filtering to detect and block intelligent bots imitating real users.

2. Anti-Bot:

A broad filter that removes the bulk of parasitic traffic before it reaches your service.

1. Anti-DDoS

The most effective strategy is an echeloned approach:

The Solution: multi-layered defense

✔ High-frequency flooding
✔ Low-frequency attacks disguised as legitimate user activity
✔ API vulnerabilities
✔ Advanced automated threats that bypass static security measures

11. Conventional DDoS solutions fail with

Restricts the number of requests a server accepts within a certain timeframe. While effective against web scraping and brute-force attacks, it is insufficient against complex, multi-vector DDoS attacks.

10. Rate Limiting

Uses static signatures to filter requests that exploit application vulnerabilities, preventing account hacking and data breaches. However, it does not mitigate large-scale automated attacks.

9. Web Application Firewall (WAF)

Increases packet delivery time to delay and filter attack traffic. However, the effectiveness is limited by the bandwidth between the service provider and the filtering platform.

8. Traffic Rerouting

Examines packet structures for compliance with RFC formats. It identifies applications based on standard patterns, such as header format and port numbers. However, sophisticated attackers can obfuscate their traffic to evade detection.

7. Deep Packet Inspection (DPI)

Uses SYN-cookie mechanisms to detect malicious traffic. The server responds to connection requests with a SYN+ACK packet while excluding the SYN request from memory. If legitimate, the client replies with an ACK packet, allowing the connection. This method prevents SYN flood attacks but adds processing overhead.

6. SYN Cookies

Distributes attack traffic across multiple data centers to mitigate impact. Requires high network capacity to withstand large-scale attacks.

5. Anycast Routing

Filters traffic by geo-location or specific IP addresses, often leading to mass blocking of legitimate users. Ineffective against geographically distributed attacks, mobile networks, and public Wi-Fi users.

4. IP Blocking

Isolates the IP addresses of attacked hosts by routing all malicious traffic to a non-existent address, sacrificing availability to protect other resources.

3. Blackhole Routing

Can sometimes result in false positives, blocking legitimate user requests.

2. BGP FlowSpec

Can operate in always-on (inline) or on-demand (on-a-stick) modes. It analyzes live traffic or NetFlow data from routers, detecting attacks by comparing traffic patterns with known signatures and behavioral anomalies. However, it may not effectively counter sophisticated, evolving threats.

1. Intrusion Detection System (IDS) / Intrusion Prevention System (IPS)

Most rely on existing anti-DDoS solutions, but these often come with significant drawbacks.

10 Common DDoS defense ...

Anna Nigmati

Business Development Manager at Secwell

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