Enterprise Intranet DDoS Attack Defense: AINOPOL All-Optical Gateway Built-in Traffic Scrubbing Ensures Business Continuity

In the era of digital office, enterprise intranet servers, ERP systems and video conferencing platforms have become core business assets. Intranet DDoS and CC attacks occur frequently, which may cause business lag and disconnection in mild cases, and lead to system paralysis and data damage in severe cases. Most enterprises face high costs and complicated deployment when purchasing dedicated independent traffic scrubbing devices separately.

AINOPOL all-optical gateways are natively integrated with traffic scrubbing, IPS and antivirus modules. Built on F5G all-optical architecture, they establish an end-to-end anti-attack system. No extra hardware is required to ensure 7×24 uninterrupted enterprise business operation at low cost.

I. Severe Hazards of Enterprise Intranet DDoS Attacks & Defects of Traditional Defense Solutions

Nowadays, enterprises have diversified network access points including office terminals, industrial control devices, guest wireless networks and SD-WAN links of branch offices, resulting in increasingly diverse sources of intranet attacks: intranet flood attacks initiated by infected employee terminals, attack programs carried by guest devices, reflected attacks via remote branch links, industrial control port scanning and malicious intranet flooding launched by internal staff, all triggering cascading operational risks.

1. Core Losses Caused by Attacks

Core Business Disruption

SYN Flood, UDP Flood and CC session attacks exhaust server CPU, memory and egress bandwidth, paralyzing financial systems, production ERP and video conferencing services. Order entry, production scheduling and business negotiations are fully suspended, directly resulting in order loss and production capacity decline. Statistics show that 76% of enterprise network congestion issues stem from rampant abnormal intranet traffic.

Confidential Data Leakage Risks

Attacks are usually accompanied by port scanning, ARP spoofing and lateral intranet penetration, making R&D drawings, financial records and customer databases vulnerable to theft. Data leakage incidents in manufacturing enterprises and group headquarters will lead to huge compensation losses and severe brand reputation damage.

Sharp Rise in O&M Costs

After being attacked, IT staff have to inspect abnormal terminals switch by switch, isolate faulty devices and restore business services, with a single attack consuming 4 to 8 working hours on average. Small and medium-sized enterprises without dedicated security personnel face longer troubleshooting cycles and greater economic losses.

2. Four Major Pain Points of Traditional Defense Measures

High Hardware Investment: Independent anti-DDoS traffic scrubbing devices are expensive and unaffordable for most SMEs. Equipped with additional switches and firewalls, such solutions occupy excessive wiring and cabinet resources.

Isolated Deployment: Traffic scrubbing devices, campus intranet facilities, SD-WAN equipment and wireless APs are supplied by different vendors, leading to unsynchronized security policies and failure in unified identification and interception of internal and external network attacks.

Wide Defense Blind Spots: Traditional firewalls only defend Layer 2 to Layer 4 data packets, failing to identify application-layer CC attacks and session exhaustion attacks, and lacking refined traffic management for internal terminals, guest Wi-Fi and remote branch networks.

Complicated Fault Switchover: There is no automatic traffic diversion and scrubbing mechanism after attacks occur. Manual link switching easily causes secondary network outages, making imperceptible business protection impossible.

II. AINOPOL All-Optical Gateway Integrated Traffic Scrubbing & Defense Solution

Adopting self-developed PON chips, AINOPOL ZH-series integrated all-optical gateways integrate traffic scrubbing, IPS intrusion prevention, antivirus protection, five-tuple access control and bandwidth scheduling into a single device. Combined with POL passive all-optical two-layer flat architecture, it builds a four-layer closed-loop DDoS defense system covering access, transmission, gateway and cloud layers, applicable to office areas, workshops, guest networks and remote branch offices.

1. Intelligent Traffic Baseline Modeling, Second-level Identification of Abnormal Attack Traffic

Embedded with AI traffic analysis engine, the gateway automatically learns 7-day normal business traffic baselines to distinguish office traffic, video conferencing data, monitoring stream and industrial control command traffic, and monitors traffic speed, session quantity and packet features in real time.

Automatically judge flood attacks when packets from a single source IP exceed 30% of the baseline threshold per second;

Identify CC crawler attacks via high-frequency repeated HTTP/HTTPS access behaviors;

Block malformed TCP packets, fake SYN handshakes and DNS reflection attack packets.

The attack recognition response time is less than 1 second, far faster than the minute-level detection of traditional devices, realizing early attack interception.

2. Built-in Integrated Traffic Scrubbing Engine, Zero Impact on Normal Business

No external scrubbing hardware is needed. The gateway locally completes traffic diversion, filtering and reinjection with diversified scrubbing strategies:

Precise five-tuple filtering: Block malicious terminals based on source IP, destination IP, port, protocol and MAC address to isolate infected devices and illegal guest terminals automatically;

Session speed limit control: Cap the maximum concurrent sessions of single terminals to prevent server connection exhaustion caused by CC attacks;

Dynamic bandwidth scrubbing: Discard attack traffic and prioritize transmission of normal office, financial and video conferencing traffic without affecting daily business;

Linked FEC packet loss compensation: Enable 30% packet loss tolerance algorithm for video and voice services after traffic scrubbing to avoid audio and video stuttering.

3. Four-tier Full-scenario Security Architecture to Block Internal and External Attack Entries

Access Layer Security (Opto-electrical AP Terminals): Wi-Fi6 opto-electrical converged APs support port protection and single-terminal connection limit. Physical isolation is realized between guest SSID and intranet VLAN to prevent scanning attacks from guest devices. Industrial POF optical APs in workshops lock industrial control ports and shield high-risk ports.

Transmission Layer Security (Passive All-Optical Links): The all-fiber passive optical splitting architecture has no active forwarding nodes, eliminating traffic hijacking and man-in-the-middle attacks. PON optical links adopt hardware encryption, and SD-WAN remote tunnels adopt national standard IPsec encryption to block cross-branch reflected DDoS attacks.

Gateway Layer Security (Core Integrated Scrubbing Module): Equipped with IPS intrusion prevention with over 5,000 feature databases and antivirus engine supporting 200,000+ virus signatures, it intercepts flood attacks launched by intranet Trojans, worms and ransomware, and supports ARP defense and DoS suppression to eliminate intranet broadcast storms.

Cloud O&M Layer (EAAS Management Platform): The platform collects full-network attack logs in real time and generates traceability reports to accurately locate attacked terminals. It supports one-click batch distribution of security policies to gateways in all campuses and branches for synchronous defense rule updates.

4. Multi-link Redundancy Ensures Uninterrupted Business under Attacks

The gateway supports hybrid access of multiple broadband lines and SD-WAN dedicated lines, and realizes dual-device VRRP redundancy via CPE deployment. When a single link is hit by high-traffic attacks, core business traffic will be automatically switched to standby links within 50ms, ensuring uninterrupted operation of ERP, monitoring systems and voice calls. Intelligent route selection automatically diverts suspicious traffic for scrubbing without occupying high-quality business links.

III. Core Advantages of Solution Implementation

Hardware Integration Cuts Costs: One integrated gateway replaces firewalls, independent traffic scrubbing devices and routers, reducing cabinet occupation and equipment procurement costs. The passive all-optical architecture lowers switch investment, achieving an overall hardware cost reduction of over 40%.

Simple Deployment & Easy Renovation: Compatible with existing network cables, optical fibers, monitoring equipment and IP phones. It supports bypass and series connection deployment modes with no network outage required during renovation, and can be configured by ordinary O&M staff.

Unified Full-network Defense: Headquarters gateways realize centralized management of SD-WAN devices in nationwide branches. A unified set of defense policies covers headquarters, campuses, stores and workshops to eliminate remote networking security blind spots.

Lightweight O&M: The EAAS platform provides visualized attack monitoring on mobile and PC terminals with automatic alarm and malicious terminal isolation functions, cutting manual troubleshooting work and reducing O&M labor costs by 70%.

Smooth Long-term Upgrade: The optical fiber backbone supports smooth capacity expansion of 10G/40G PON networks. Security feature databases are updated automatically via cloud without hardware replacement to cope with emerging attack methods.

IV. Overall Implementation Value Summary

Traditional enterprises need to deploy multiple security devices and multi-layer network architectures to build complete DDoS defense systems, which involve high upfront investment and continuous high later-stage O&M and upgrade costs.

AINOPOL integrated all-optical gateways combine traffic scrubbing, intrusion prevention, antivirus, routing switching and SD-WAN functions in one device. Based on passive POL all-optical networks, it builds a full-range security barrier suitable for single-story office buildings, large manufacturing factories and multi-park group enterprises. Enterprises can realize 7×24 all-time business protection with low investment, avoid production suspension, data leakage and excessive O&M losses caused by intranet attacks, and consolidate the network security foundation for digital business operation.

FAQ

Q: Is this anti-DDoS solution applicable to small offices with dozens of employees? Is the cost high?

A: Fully applicable. Small and micro enterprises can adopt compact integrated gateways with complete built-in traffic scrubbing, IPS and antivirus functions without additional security devices. Passive opto-electrical APs can be deployed on demand for low-cost construction, cutting over half of the total cost compared with separate purchase of firewalls and traffic scrubbing equipment.

Q: Can cross-regional intranet attacks be intercepted for remote branches connected via SD-WAN?

A: Yes. SD-WAN tunnels adopt IPsec encrypted transmission. Central gateways uniformly identify abnormal traffic from branches, and cross-network segment attacks will be scrubbed and isolated at egress gateways without penetrating into headquarters intranet servers.

Q: Can attack logs be stored to meet cybersecurity grade protection audit requirements?

A: Local logs can be stored for more than 6 months, and complete audit reports recording attack time, terminal locations and attack types are available for export, fully complying with Grade Protection 2.0 audit standards.