Application Protection

    Layer 4 protection for applications

    Put your TCP applications and web backends behind always-on scrubbing. We absorb SYN floods, ACK floods, and connection-exhaustion attacks at the edge while clean traffic keeps flowing to your origin.

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    What a DDoS attack looks like

    Most attacks on applications are floods of traffic engineered to exhaust your connection table or saturate your link. These are the patterns we filter at the edge before a single packet reaches your origin.

    UDP floods
    High volumes of UDP packets aimed at your ports to saturate bandwidth and overwhelm services.
    SYN floods
    Half-open TCP connections that pile up until your server's connection table is exhausted.
    ACK & SYN-ACK floods
    Spoofed ACK packets that burn CPU and bandwidth without ever completing a handshake.
    Connection exhaustion
    Floods that hold open or rapidly cycle connections so legitimate clients can't get through.
    Reflection & amplification
    Spoofed requests bounced off open servers to multiply attack traffic aimed at you.
    Fragmented packet floods
    Malformed or fragmented packets crafted to slip past naive filters and tie up resources.

    Floods stopped before your app feels them

    Attack traffic is filtered in-path at our edge, so SYN floods, ACK floods, and connection-exhaustion attacks never reach your servers.

    • Mitigation is always on, not triggered after impact
    • SYN/ACK floods are dropped before they exhaust your connection table
    • Clean traffic keeps reaching your origin throughout an attack

    Built for application traffic

    SYN & ACK flood mitigation
    Volumetric and protocol floods are dropped at the edge before they can exhaust your servers' connection tables.
    Stateful TCP filtering
    Connection-aware filtering separates real clients from attack traffic so legitimate requests always get through.
    Minimal added latency
    Traffic is scrubbed in-path on low-latency routes, so protection never becomes the bottleneck for your application.
    Origin stays hidden
    Your real backend IPs never face the public internet. Only clean traffic from our edge reaches them.
    TLS pass-through
    Encrypted traffic is forwarded untouched at Layer 4. We never terminate or inspect your TLS.
    Minutes to provision
    Point your service through a tunnel and you're protected with guided setup and automated provisioning.

    Protection you can measure

    Always-on mitigation, sized for the attacks we actually see.

    < 0.5s

    Time to mitigation

    2.4M+

    Attacks mitigated

    1.2 PB+

    Traffic scrubbed

    99.95%

    Uptime

    What makes Sterile different

    Always-on mitigation built by people who run the infrastructure, not an add-on you switch on after the damage is done.

    Always-on protection

    Mitigation runs continuously. Attacks are filtered from the very first packet.

    Near-instant mitigation

    Detection to mitigation in under half a second, automatically. No manual intervention, no waiting on a NOC.

    Your origin stays hidden

    Your real backend never faces the public internet. Only clean traffic from our edge ever reaches it.

    Transparent pricing

    Clear, usage-based pricing with no hidden gotchas. You only pay for the protection you actually use.

    Keep your applications online

    Provision protection in minutes and route your application traffic through Sterile Networks.