Real-time DDoS mitigation: filtering attacks before the service drops
Real-time DDoS mitigation means detecting abnormal traffic, applying precise filtering and delivering clean traffic before links, firewalls or game servers collapse.
DDoS 攻击：症状、攻击向量与过滤。
服务不可用并不能直接确定攻击向量。先检查流量方向、受影响的目的地址，以及数据包在哪一环节无法通过，再结合具体协议分析。
这些指南讨论网络洪泛、反射、连接处理和过滤能力的边界。仅凭数据包样本或高比特率不能确定中断原因，还需结合服务状态和路由信息。
建议阅读顺序
明确故障现象
记录问题开始时间、受影响的目标，以及字节数、包数或连接尝试是否增加。保持测量间隔和计数口径一致。
识别协议行为
反射攻击中，应区分发往反射器的请求与受害者收到的响应。DNS、NTP 和 Memcached 的消息类型、防护控制和暴露条件不同。
收紧策略前检查正常流量
将过滤条件与正常业务、NAT 使用和回程路由进行比较。有状态 TCP 控制需要符合其设计的流量路径；规则更严格不代表规则更正确。
本专题指南
19 篇指南部分指南仅提供英文版。打开前即可看到语言标识。
19 / 19 篇指南
Why a firewall alone may not stop a DDoS attack
Separate link saturation, packet processing, connection state and application load to find where a firewall needs upstream or specialist DDoS protection.
High-PPS DDoS mitigation: measure the packet path
Find packet-rate bottlenecks with explicit frame sizes, queue and worker measurements, legitimate-traffic tests and a capacity result you can reproduce.
How to detect a DDoS attack before it takes your service offline
Learn the practical signs of a DDoS attack: traffic spikes, high PPS, failed connections, abnormal UDP/TCP patterns, overloaded firewalls and degraded gaming or web services.
DDoS vs DoS: difference, impact and protection choices
Understand the difference between DoS and DDoS attacks, why it changes the mitigation design and when to choose protected IP transit, a protected server, VPS or gaming proxy.
UDP flood protection: protect servers, VPS and gaming traffic
A practical guide to protect exposed UDP services without breaking legitimate traffic for games, VPS, dedicated servers, protected transit and real-time applications.
Anti-DDoS VPS: how to choose protection that actually holds
A practical guide to choosing an Anti-DDoS VPS without confusing basic hosting, real network filtering, gaming protection and protected transit.
Enterprise DDoS protection: protect critical services without slowing growth
A practical guide to enterprise DDoS protection for exposed services, hosting platforms, dedicated servers, BGP networks and gaming infrastructure across Europe.
How Anti-DDoS works: from raw attack traffic to clean delivery
Understand how Anti-DDoS filtering absorbs volumetric attacks, separates legitimate users from hostile traffic and delivers clean traffic to transit, servers and gaming services.
Memcached DDoS: diagnosis and mitigation
Diagnose reflected Memcached replies, distinguish victim-side filtering from securing a cache, and preserve legitimate traffic when choosing where to mitigate.
NTP amplification: diagnosis and filtering
Distinguish legitimate time synchronization from reflected NTP traffic, restrict exposed control queries and validate mitigation without breaking your clocks.
ACK flood protection: mitigate TCP DDoS attacks without blocking real sessions
An ACK flood targets the part of TCP that should normally look legitimate: packets that appear to belong to established connections. The problem is not only bandwidth. High packet rate, spoofed ACKs and asymmetric paths can exhaust firewalls, load balancers, routers or servers before the application understands what is happening. Good mitigation must reduce the flood early while preserving real sessions that already exist.
DDoS amplification attack explained: why small requests can become massive floods
A DDoS amplification attack uses third-party services to turn small spoofed requests into much larger responses sent to the victim. The target does not only receive traffic from the attacker. It receives reflected traffic from many legitimate servers on the Internet, often using UDP-based protocols. Understanding amplification is essential before choosing protected IP transit, a scrubbing model or a gaming proxy, because the failure point is usually upstream capacity rather than the application itself.
DNS amplification DDoS mitigation: protect exposed infrastructure without blocking legitimate DNS
DNS amplification is one of the most common UDP reflection patterns because DNS is widely available, response sizes can be larger than requests and spoofed traffic can be directed at a victim. The mitigation challenge is precise: blocking all UDP/53 may stop a graph, but it can also break DNS-dependent services. A serious design separates open resolver abuse, reflected floods and legitimate DNS traffic before the attack reaches the customer edge.
SYN flood protection: mitigate TCP DDoS attacks without blocking real connections
A SYN flood is not only about sending many packets. It abuses the TCP opening phase to create pressure on connection queues, stateful firewalls, load balancers and exposed servers. Effective protection must filter early, avoid state exhaustion and keep legitimate users able to establish sessions.
UDP flood mitigation: stop a UDP DDoS without breaking legitimate traffic
A UDP flood is not just “a lot of UDP packets”. Depending on the service, it can saturate a link, exhaust a firewall, trigger useless responses or disrupt a real-time protocol such as gaming, VoIP, DNS, VPN or a UDP-based application. Good mitigation is not about blocking UDP everywhere. It is about separating obvious noise from useful traffic, protecting upstream capacity and delivering clean traffic with low latency.
Volumetric vs application-layer DDoS: differences, risks and the right mitigation model
A volumetric DDoS attack and an application-layer DDoS attack do not break a service in the same way. The first mainly tries to saturate network capacity, ports, packet rate or upstream paths. The second targets service logic: HTTP, APIs, authentication, game proxies or expensive requests. Understanding the difference helps choose a mitigation design that actually works instead of relying on a generic Anti-DDoS promise.
L3, L4, L7 protection: the real differences in Anti-DDoS
L3, L4 and L7 are often used as sales labels, but they do not protect the same part of the traffic path. This guide explains the real differences between network, transport and application filtering, and how to choose a coherent Anti-DDoS design with protected IP transit, tunnels, reverse proxy or router VM.
After a DDoS attack: verify service recovery
Check user journeys, retire temporary filters and preserve an incident record before declaring recovery.
没有匹配的指南。请尝试协议名称或更短的关键词。
根据瓶颈选择应对方式。
接入链路饱和时，在链路下游过滤无法恢复已经损失的容量。比较受保护网络交付与本地过滤，并在选型前验证包速率和比特率。