aleksgrim

aleksgrim / crab-shield

Public

🦀 A high-performance, hybrid L3/L4/L7 anti-DDoS firewall powered by eBPF/XDP and Rust. Zero CPU overhead mitigation.

botnet-layer-7 ddos-protection ebpf firewall linux
13
1
100% credibility
Found Apr 17, 2026 at 13 stars -- GitGems finds repos before they trend. Get early access to the next one.
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AI Analysis
Rust
AI Summary

CrabShield is an anti-DDoS protector for Linux servers that watches web logs and network traffic to automatically block attacking visitors early.

How It Works

1
🚨 Spot the Problem

Your website slows down because too many suspicious visitors are flooding it, making real users frustrated.

2
🔍 Discover CrabShield

You find CrabShield, a smart protector that keeps bad traffic away from your server without slowing it down.

3
📥 Get It Ready

Download the protector and follow easy steps to prepare it for your server.

4
🛡️ Hook It Up

Connect it to your server's network gate and watch folders where it logs visitor activity.

5
⚙️ Set Your Rules

Choose what counts as bad behavior, like too many errors or sneaky paths, so it knows what to stop.

6
▶️ Turn It On

Launch the protector, and it quietly starts blocking attacks right at the door.

✅ Stay Protected

Your server runs smoothly, bad visitors get stopped instantly, and your site stays fast for everyone.

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Star Growth

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AI-Generated Review

What is crab-shield?

Crab-shield is a Rust-based anti-DDoS firewall for Linux servers that combines L3/L4 packet dropping with L7 log analysis to block volumetric floods and app-layer attacks like 404 storms or brute-force logins. It attaches to your NIC via eBPF/XDP for zero-overhead mitigation—dropping bad traffic before it hits the CPU—while tailing Nginx or Traefik access logs to detect sneaky threats. Users get a single static binary daemon, configurable via TOML for thresholds, whitelists, and threat-intel feeds, deployable as a systemd service on x86_64 or ARM64.

Why is it gaining traction?

Unlike iptables or Fail2ban, which crush CPU during attacks, crab-shield bypasses the network stack entirely, letting cheap VPSes handle millions of packets/sec at under 5% CPU—like high performance github projects but for hybrid L3/L7 defense. Devs dig the async log tailing for instant bans on bad User-Agents or paths, plus auto-expiry and external blocklist pulls, all without deps. It's a fresh take on high performance hybrid firewalls, cross-compiled for easy cloud deploys.

Who should use this?

Linux sysadmins on self-hosted web stacks facing scanners, scrapers, or botnets—think Nginx/Traefik on Hetzner or Oracle VPS. Ideal for indie devs or small teams dodging Cloudflare costs while hardening APIs/databases. Skip if you're on non-Linux or need IPv6/CIDR yet.

Verdict

Promising for high performance github-style networking tools, but at 13 stars and 1.0% credibility, it's early alpha—solid README/docs but light on tests/examples. Try in staging if you need zero-overhead DDoS blocks; watch for maturity.

(187 words)

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