BGP 会话建立只是受保护连接的一部分。还需要合法授权的通告、可达的交付端点、可用的 MTU，以及符合过滤策略的回程路径。
本专题从路由选择讲到清洗后交付。应区分本地路由策略、上游接收策略和物理链路容量；改变其中一项不会自动消除其他限制。
检查 ASN 和前缀授权、预期路由起源以及提供商的接收策略。路由起源验证并不等于确认整条路径可信。
比较路由交付、隧道交付与物理互联。记录实际端点、封装、MTU 和回程路由，在迁移生产流量前测试两个方向。
检查故障后保留的路径和流量分布。FlowSpec 与黑洞路由的作用范围不同，应提前规定验证、撤回与回滚条件。
部分指南仅提供英文版。打开前即可看到语言标识。
24 / 24 篇指南
IP transit latency is not only a matter of distance. BGP decisions, PoP location, return path, tunnels and mitigation design all influence how users experience a protected service.
Peering and IP transit do not behave the same way under DDoS pressure. This guide explains the routing, capacity, economic and operational differences for protected networks.
A multi-upstream DDoS design combines several transit providers, routing policies and mitigation layers to reduce single points of failure. This guide explains what it solves and what it does not solve by itself.
Upstream DDoS filtering protects a service before the attack reaches the customer port, firewall or server. This guide explains when it is useful, how it differs from blackholing and how to combine it with clean traffic delivery.
Anycast distributes traffic toward several points of presence, but it is not a magic shield. The clean delivery model after mitigation still decides latency, stability and customer experience.
BGP is the protocol that lets networks announce reachability to each other. Understanding prefixes, AS paths, communities and route preference is essential before buying protected transit.
Blackholing saves capacity by sacrificing a destination. FlowSpec can remove attack traffic more precisely, but only when rules are short, measurable and reversible.
A route hijack can divert, intercept or blackhole traffic before packets reach your infrastructure. DDoS planning must include routing security, monitoring and fast withdrawal procedures.
Use IPv4 packet length as one narrowly scoped FlowSpec condition, with correct byte accounting, fragment checks, enforcement evidence and a withdrawal plan.
TCP flags can make FlowSpec rules precise against SYN, ACK or RST floods, but they become risky when they ignore connection state, asymmetric routing and legitimate protocol behavior.
BGP FlowSpec is powerful for upstream relief, but it is not a full mitigation engine. Its limits appear around state, context, provider support, rule scope and false-positive risk.
Protected IP transit combines Internet connectivity and Anti-DDoS mitigation in the same delivery model. The benefit is not only attack absorption, but clearer routing, cleaner handoff and fewer emergency migrations.
A protected IP transit guide to choose between BGP, GRE, IPIP, VXLAN or cross-connect after Anti-DDoS mitigation.
Asymmetric routing is not automatically a problem in Anti-DDoS. The real question is which functions require strict symmetry, how clean traffic returns to production, and whether the provider depends on mechanisms such as SYN proxy. This guide explains when asymmetry truly becomes an issue, why some providers tolerate it poorly, and why at Peeryx it does not degrade filtering quality.
For hosters, MSPs and exposed service providers, Anti-DDoS IP transit is a network building block that protects prefixes, preserves commercial continuity and returns clean traffic to production. This guide explains how to evaluate it with an operator mindset instead of a simple marketing angle.
VXLAN and IPIP do not solve exactly the same clean traffic delivery problem after DDoS mitigation. This guide explains when each one makes sense, which limits matter and how to choose a model that matches your topology, edge design and operations.
Validate the handoff after mitigation: addressing, routes, MTU, both traffic directions, application behavior and recovery on each delivered path.
Plan tunnel termination and routing in a VM with explicit forwarding limits, route policies, host dependencies and an acceptance test beyond an established BGP session.
BGP Flowspec can be extremely effective to coarse-filter a DDoS attack, protect links and buy time for deeper mitigation. This guide explains where it creates real value, where it becomes dangerous and how to integrate it into a serious layered strategy.
Upstream Anti-DDoS pre-filtering is meant to relieve pressure early, protect links and reduce load before fine-grained decision layers take over. This guide explains when to use it, what it should actually do and why it changes the global cost/performance ratio.
In Anti-DDoS architecture, mitigation alone is not enough: legitimate traffic still has to be delivered back correctly. This guide explains why clean traffic handoff matters as much as scrubbing, how to choose the right delivery model and which mistakes break daily operations.
GRE remains one of the most practical ways to return clean traffic after Anti-DDoS mitigation. This guide also helps compare GRE tunnels, protected IP transit and clean handoff with real architecture, operations and buying logic.
A practical guide to link saturation, 95th percentile billing risk, blackholing, asymmetric routing, adaptive filtering and the importance of both Gbps and Mpps.
Simple GRE tunnel, GRE + BGP or protected IP delivery: this guide helps choose the right model depending on your architecture, prefixes, routing-control requirements, target latency and deployment speed.
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受保护的 IP Transit 为符合条件的通告提供网络服务。路由器虚拟机提供路由端点，同时具有独立的资源和流量限制。请按实际需求选择组件。
