DDoS Defence Practical Guide｜08Host VAC protection system in-depth analysis

I. Understanding the nature of DDoS attacks

Step 1: Network ecosystems in a normal state

When the business system is in a healthy state:

• Flow characteristics: Regular fluctuations in line with business modelling (weekday peaks, promotional spikes, etc.)
• Protocol Interaction: TCP three handshakes complete, HTTP request response time <200ms
• Depletion of resources: CPU utilisation 30%-60%, memory usage stable below the warning line
• typical case: An e-commerce platform processed 120,000 legitimate requests per second during the Double 11 period

skill::

Normal traffic = operational baseline ± 20% fluctuation
Abnormal determination condition: exceeding the baseline value of 300% for 5 consecutive minutes and not in line with business characteristics

II. DDoS attack alerts

Step 2: Six Signs of an Attack Beginning

1. network layer anomaly (computing)::
   • Bandwidth utilisation 100% lasts over 5 minutes
   • Router CPU usage >95%
   • Frequent BGP session interruptions
2. application layer exception::
   • HTTP 503 error rate spikes
   • SSL handshake failure rate exceeds 60%
   • API Response Time Breaks the 5 Second Threshold

Matrix of attack types::

III. Operational defence

Step 3: Path to technical realisation of the VAC solution

First Line of Defence: Intelligent Traffic Classification

def traffic_classification(packet): if packet.ttl  1400.
    if packet.ttl  1400.
        return "suspected anomaly"
    elif tcp_flags_analysis(packet) == "Unconventional Combination".
        return "High risk traffic"
    else.
        return "Entering behavioural analysis layer"

Core Functional Modules::

1. protocol stack fingerprinting
   • Accuracy: 99.7% (based on 10 million samples training)
   • Recognition speed: <0.3ms/packet
2. Dynamic Rate Limiting Algorithm

   RateLimit = Baseline × (1 + 0.2 × sin(2πt/86400))
   + AttackCoefficient × ΔTraffic

3. Business Imaging System
   • Learning Cycle: 72 hours to build accurate models
   • Feature dimension: 218 business metrics to monitor

Comparison of measured data::

IV. End of the attack

Step 4: Key actions after the attack

1. Digital forensic analysis
   • Heat map of geographic distribution of attack source IPs
   • Attack message signature fingerprint database update
   • Business impact assessment report generation
2. Defence strategy optimisation
   • Dynamically adjusting rules: updating ACLs based on machine learning results
   • Resource elasticity scaling: automatic recycling of cleaning nodes saves costs
3. Security Hardening Recommendations
   • CDN node expansion from 12 to 32 (recommended configuration)
   • Source station IP replacement cycle reduced to 72 hours
   • Enabling BGP Anycast Architecture

Five,Enterprise Protection Solution Selection Guide

08Host-VAC Core Advantages::

• Intelligent Learning System: Operational adaptation time < 3 hours
• Hybrid Protection ArchitectureSimultaneous support for 5Gbps-3Tbps attack defence
• SLA Guarantee: 99.99% availability + 5-minute response commitment

Deployment recommendations::

1. SMEs: Hybrid Deployment of Cloud Cleaning + Local Protection
2. Financial Grade Customers: Multi-Availability Redundant Architecture + Private Stacks
3. Gaming Industry: Dedicated Gaming Protocol Protection Module

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