DDoS stands for Distributed Denial-of-Service Attack. It is an expanded form of the older DoS attack (Denial-of-Service Attack), and its purpose is to use various attack methods to paralyse network system functions or exhaust resources, forcing websites or game servers to go offline and preventing legitimate users from accessing web services or playing online games.
Single source: DoS attacks typically originate from a single attacker or system.
DDoS Attack：
Multiple sources: DDoS attacks involve multiple attack sources, typically comprised of a large number of infected computers known as a "botnet."
Attack method: These controlled systems launch coordinated attacks, making the assault far more difficult to defend against and trace.
Scope of impact: Because DDoS attacks come from numerous sources, their intensity and range of impact far exceed that of DoS attacks.
In the early days, when computing power was less advanced, a one-on-one DoS attack could succeed as long as the attacker's machine outperformed the target's. However, with today's advances in computer technology, straightforward DoS attacks can mostly be defended against and neutralised. As a result, many-to-one DDoS has become the go-to attack method for modern-day hackers.
What Are the Common DDoS Attack Methods? All DDoS attack methods aim to exhaust a website's resources through a flood of invalid requests. They can be broadly categorised into:
Bandwidth Consumption Attacks
These attacks send massive volumes of invalid or maliciously amplified data requests to saturate the target server's bandwidth, preventing legitimate users from accessing the site — and potentially causing the website to crash entirely.
Common examples include:
UDP Flood / ICMP Flood — Floods the server with large volumes of invalid data, also known as "Flood Attacks."TearDrop Attack — Sends fabricated data fragments with manipulated offset information, causing the system to fail during reassembly and consuming bandwidth.Ping of Death — Generates data packets that exceed the maximum length allowed by the IP protocol, causing the system to crash.
Resource Consumption Attacks
Unlike bandwidth consumption attacks, resource consumption attacks force the target server into repeated, futile operations that drain its resources, rendering it unable to respond to legitimate user requests.
Common examples include:
SYN Flood — Sends TCP connection requests to the server but deliberately interrupts the TCP three-way handshake, causing the server to keep sending requests and waiting for responses that never come — exhausting its resources.LAND Attack — A variant of SYN Flood where the source IP in the request is set to the victim's own address, causing the system to endlessly reply to itself until resources are depleted.CC Attack (Challenge Collapses) — Uses a large number of servers to send simulated legitimate HTTP requests to the target, overwhelming it.Botnet Attacks — Coordinated attacks using networks of compromised machines, all with the goal of exhausting server resources.
How Can You Detect a DDoS Attack?
Detecting a DDoS attack typically involves multiple techniques and strategies, with the primary goal of identifying abnormal traffic and potential attack patterns. The following are common DDoS detection methods:
Traffic Monitoring:
Monitor network traffic to identify unusual spikes. For example, if a website suddenly experiences a massive surge in traffic, this may be a sign of a DDoS attack.
Anomalous Behaviour Analysis:
Analyse traffic patterns to identify behaviour that deviates from the norm. DDoS attacks typically generate abnormal traffic patterns such as sudden spikes or unusual traffic from specific regions.
Baseline Establishment:
Establish a baseline of normal network traffic to use as a reference. When actual traffic deviates significantly from the baseline, a DDoS attack may be underway.
Packet Analysis:
Inspect network packets for suspicious or abnormal patterns — such as large volumes of identical packet types or packets originating from a single source.
IP Address Blacklisting:
Use IP blacklists to filter out known malicious sources, helping to block traffic from known attackers.
Anomalous Connection Data Analysis:
Monitor connection data such as simultaneous connection counts and connection request rates. Abnormal increases may indicate a DDoS attack.
Third-Party Security Services:
Leverage professional DDoS protection services, which typically feature more advanced detection and defence mechanisms.
Response Time Monitoring:
Monitor server and application response times. A sudden increase in response time may indicate that the server is under a DDoS attack.
What Impact Can DDoS Attacks Have on Your Business?
When an enterprise falls victim to a DDoS attack, the consequences extend far beyond the attack itself. In addition to being extorted for large ransoms and suffering significant financial losses, businesses also risk losing customer trust and damaging their brand reputation and credibility. Security vulnerabilities not only create a negative public image, but may also expose the company to legal liability.
💸 Ransom demands and financial losses
🤝 Loss of customer trust
📉 Damage to brand reputation and credibility
⚖️ Legal liability and potential litigation
What Solutions Are Available Against DDoS Attacks? DDoS attacks are notoriously difficult to defend against because the "attack" is disguised as seemingly legitimate "requests", and the difficulty in tracing the source makes them even more challenging to counter. That said, the following three approaches can significantly strengthen your DDoS defence:
Strengthen Firewall Rules
Using high-performance firewalls to restrict requests from abnormal IP addresses helps reduce the likelihood of large volumes of invalid data consuming bandwidth or depleting resources. This enhances filtering mechanisms and improves the effectiveness of blocking DDoS attacks.
Upgrade Equipment Performance and Specifications
Upgrading hardware performance buys more buffer time during a DDoS attack, allowing the system to remain online while countermeasures are implemented in response to the attack pattern, minimising damage.
Deploy Systems with Built-In DDoS Protection
Solutions such as DDoS traffic scrubbing redirect traffic into a cleaning system that filters out and eliminates abnormal traffic sources. Other built-in protections include blocking a defined number of invalid data packets and setting reasonable limits on simultaneous connections, effectively neutralising DDoS attacks before they cause damage.
Facing a DDoS Attack? Here's What GAIA Information Technology Can Do for You:
Since traditional equipment cannot withstand large-scale DDoS attacks, adopting a cloud-based defence strategy is the most effective solution available. As technology evolves rapidly, so do DDoS attack methods. When faced with an especially complex DDoS attack, seeking assistance from a professional team is always the wisest course of action.
When our clients come under DDoS attack, GAIA Information Technology provides the following immediate support:
✅ Assist clients in assembling a dedicated DDoS defence team with a full defensive strategy deployed within the same day.
✅ Real-time network monitoring and coordination with the security operations centre for DDoS attack mitigation.
✅ Continuous systematic monitoring and production of DDoS attack incident reports.
✅ 24/7 multilingual online real-time operations and maintenance support.
As the largest professional DDoS service provider in the Asia-Pacific region, GAIA Information Technology brings extensive DDoS defence experience, having handled over 10,000 DDoS attack incidents. We offer a diverse range of defence measures tailored to different attack types, with onboarding services available in as little as 10 minutes. Our professional one-stop consultancy service resolves all related cloud security concerns for our clients.
If you have any questions or requirements, we sincerely welcome you to contact us .
(1).png)