Shock Stresser is an IP stresser service that simulates DDoS scenarios against your own servers and network devices — so you know exactly where your defenses fail before an attacker does.
Only for use on infrastructure you own or have written authorization to test.
An IP stresser — also called a network stresser or simply a stresser — is an online tool that generates controlled, high-volume traffic directed at an IP address or domain to test the stress tolerance of that infrastructure under simulated attack conditions.
A stresser sends packets — UDP datagrams, TCP SYN segments, or application-layer HTTP requests — at rates that can exceed tens of millions per second. The target infrastructure (server, router, firewall, CDN edge node) must absorb or filter this traffic. The stresser measures at what traffic volume the system begins to drop packets, slow down, or become unreachable — the stress threshold.
A stresser is a tool; a DDoS attack is an unauthorized use of a stresser-type tool against infrastructure you do not own. The distinction is authorization: running a stress test against your own servers is standard DevOps and security practice, and is explicitly legal. Running the same test against a third party without permission is a criminal offense under the CFAA (US), Computer Misuse Act (UK), and Directive 2013/40/EU (EU).
Layer 4 (Transport) tests flood TCP or UDP connections — they exhaust bandwidth, fill connection tables, and saturate NIC buffers. Mitigation tools: stateless ACL rules, BPF filters, SYN cookies (RFC 4987), and rate limiting at the ISP level (RTBH, FlowSpec). Layer 7 (Application) tests send valid HTTP/HTTPS requests that bypass volumetric scrubbing and instead exhaust web server threads, database connection pools, and API rate limits. Both layers must be tested for a complete resilience picture.
The key output of any stress test is the failure threshold: the exact traffic volume (in packets per second or Gbps) at which your infrastructure degrades. Secondary metrics include latency degradation curve, packet loss rate by traffic type, time-to-detection by your monitoring stack, and time-to-mitigation by your DDoS protection provider (Cloudflare, AWS Shield, Path.net, Voxility, or others). These figures feed directly into your SLA negotiations and capacity planning decisions.
From target input to downloadable resilience report in under 90 seconds.
Register and verify authorization to test your target IP or domain. No credit card required for the free tier.
Enter the target IP or hostname, port, desired method, intensity level, and test duration (up to 3600 s).
Select a stress method from 25+ vectors: UDP Flood, SYN Flood, HTTP Bypass, NTP Amplification, and more.
The test launches within 1 second. The live dashboard streams PPS, Gbps, latency, and packet loss in real time.
Download a PDF report showing failure threshold, latency curve, mitigation gaps, and remediation recommendations.
Built for engineers who need repeatable, high-fidelity load simulations — not traffic toys.
No queue, no pre-approval. Tests start within 1 second of submission on all paid plans — critical for rapid iteration testing cycles.
Distributed PoP network capable of sustaining over 500 Gbps — sufficient to stress enterprise-grade scrubbing centers and tier-1 transit providers.
From basic UDP/TCP floods to SSDP, Memcached, and CharGEN amplification, plus Layer 7 HTTP/HTTPS bypass methods targeting WAFs and CDN origin servers.
Real-time streaming of packets per second, bandwidth consumption, round-trip latency, and TCP retransmission rate — updated every 500 ms.
Run up to 20 simultaneous stress tests on different targets, ports, or methods — essential for multi-homed networks and load-balanced clusters.
Purpose-built vectors to test whether Cloudflare Magic Transit, AWS Shield Advanced, and Path.net actually absorb advanced attack patterns — before an attacker tries.
Professional export with failure threshold, latency degradation graph, PPS timeseries, and remediation checklist — formatted for compliance audits and vendor SLA reviews.
JSON REST API with webhook callbacks lets you embed stress tests into CI/CD pipelines, Terraform modules, or post-deploy validation scripts.
Enterprise tier: specify exact TCP flags, IP TTL, fragmentation offset, payload byte pattern, and source port randomization for protocol-specific edge-case testing.
Each vector simulates a specific real-world DDoS pattern. Match the vector to your testing scenario.
| Method | Layer | Protocol | Simulates | Peak Rate | Key Metric Tested |
|---|---|---|---|---|---|
| UDP-FLOOD | L4 | UDP | Volumetric bandwidth exhaustion | 90M PPS | Upstream bandwidth, ISP filtering |
| SYN-FLOOD | L4 | TCP | Half-open connection exhaustion | 120M PPS | SYN cookie support, backlog size |
| ACK-FLOOD | L4 | TCP | Stateful firewall table overflow | 100M PPS | Stateful inspection throughput |
| ICMP-FLOOD | L4 | ICMP | Ping flood / router CPU load | 60M PPS | Router ICMP rate limiting |
| NTP-AMP | AMP | UDP/NTP | Amplified reflection (×550) | 25M PPS | Volumetric scrubbing center capacity |
| DNS-AMP | AMP | UDP/DNS | DNS ANY reflection (×70) | 18M PPS | DNS scrubbing, upstream BW |
| MEMCACHED-AMP | AMP | UDP | Memcached amplification (×51,000) | 8M PPS | Peak Gbps absorption by scrubber |
| SSDP-AMP | AMP | UDP/SSDP | UPnP reflection (×30) | 12M PPS | Reflection traffic filtering |
| HTTP-GET | L7 | HTTP/1.1 | Web server resource exhaustion | 8M RPS | Web server capacity, CDN cache bypass |
| HTTPS-BYPASS | L7 | HTTPS/TLS | TLS handshake exhaustion | 2M RPS | TLS termination overhead, WAF throughput |
| HTTP-POST | L7 | HTTP/1.1 | API endpoint & DB connection flood | 4M RPS | API rate limiting, connection pool size |
| SLOWLORIS | L7 | HTTP | Slow connection hold attack | — | Max concurrent connections, timeout config |
All plans include all 25+ methods. Upgrade for longer tests, more concurrency, and higher throughput.
Shock Stresser may only be used to test infrastructure that you own or have received explicit written authorization to test. Using this tool against third-party targets without authorization constitutes a denial-of-service attack and violates the Computer Fraud and Abuse Act (CFAA, 18 U.S.C. § 1030, US), the Computer Misuse Act 1990 (UK), and Directive 2013/40/EU on attacks against information systems. Unauthorized use results in immediate account termination and referral to law enforcement. All sessions are logged. By registering, you accept full legal responsibility for every test you initiate.
Everything you need to know before running your first stress test.
A stresser — or IP stresser — is a web-based tool that generates high-volume synthetic network traffic directed at a specified IP address, hostname, or port. In a security context, stressers are used by network engineers and security teams to evaluate how an infrastructure responds to traffic surges that mimic real-world DDoS attack patterns. The term distinguishes legitimate, authorized load-testing tools from malicious "booters," which are the same class of technology used illegally against third parties.
Technically, stressers and booters use the same underlying traffic-generation technology. The difference is purpose and authorization. A stresser is a professional tool for authorized performance and security testing — a category that includes enterprise products like IXIA BreakingPoint, Spirent CyberFlood, and Keysight Threat Simulator. A booter is marketed for, or used for, unauthorized attacks. Shock Stresser is operated as a legal stress testing service; any use against unauthorized targets violates our Terms of Service and applicable law.
Most DDoS protection SLAs specify a mitigation threshold (e.g., "we mitigate attacks up to 500 Gbps") but are rarely tested by customers. Using an IP stresser to generate traffic at volumes near the SLA threshold is the most direct way to validate SLA compliance. Run a 300 Gbps UDP flood for 120 seconds and monitor whether your protected IP remains reachable and latency stays within SLA bounds. Shock Stresser's PDF report documents the test parameters, peak throughput, and target availability — usable as evidence in SLA disputes.
Yes, with conditions. AWS requires completion of a Penetration Testing Request for certain instance types and prohibits tests resembling "DDoS simulations" against multi-tenant shared infrastructure. Google Cloud does not require pre-authorization for testing your own resources but prohibits traffic targeting third parties or violating their AUP. Azure permits load testing but recommends notifying support before high-volume tests to avoid triggering abuse detection. Review your cloud provider's current acceptable use policy before each engagement — policies change.
The OSI model layer determines what component of your stack bears the load. Layer 4 (Transport) tests — UDP floods, SYN floods, ACK floods — target the network pipe and stateful devices (firewalls, load balancers). They measure raw bandwidth and connection-table capacity. Layer 7 (Application) tests — HTTP floods, HTTPS bypass, Slowloris — send legitimate-looking requests that pass volumetric scrubbing but exhaust application resources: web server threads (Apache MaxClients, Nginx worker_connections), database connection pools, or API gateway rate limiters. A complete resilience assessment tests both layers, as many organizations have strong L4 protection but weak L7 defenses.
Test duration depends on what you're measuring. 60–120 seconds is adequate for basic bandwidth benchmarks and detecting immediate failures. 5–10 minutes (300–600 s) gives DDoS mitigation systems enough time to detect the anomaly, trigger automated rerouting (e.g., Cloudflare's RTBH or Magic Transit flow steering), and reach a steady mitigation state — this is the minimum for a meaningful SLA validation test. 30+ minutes reveals slow resource leaks: memory exhaustion in web servers, connection pool depletion, log-storage overflow, or alerting fatigue in on-call rotations. Enterprise resilience audits typically run 1–4 hour soak tests before signing off on infrastructure capacity.
Every completed test generates a downloadable PDF report containing: (1) test configuration summary (target, method, port, duration, intensity); (2) peak and average packets per second; (3) peak and average bandwidth in Gbps; (4) target response latency timeseries with P50/P95/P99 breakdown; (5) packet loss rate by time interval; (6) detected failure threshold (the PPS / Gbps value at which degradation began); and (7) a remediation checklist based on observed failure modes. Reports are formatted for use in security audits, penetration testing engagements, and hosting provider SLA disputes.
Free tier available — no credit card. First stress test running in under 90 seconds.
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