skills.rest
xalgord
xalgordCOMMUNITY
Explore all skills by this author →
WebsiteGitHub

implementing-network-intrusion-prevention-with-suricata

Deploy and configure Suricata as an inline IPS with custom rules and Emerging Threats rulesets.

954|172|Updated Mar 13, 2026
Search Tags:#network security#rule management#suricata#intrusion prevention#ips#emerging threats#nfqueue
One-click install
npx skills add https://github.com/xalgord/xalgorix --skill implementing-network-intrusion-prevention-with-suricata
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: implementing-network-intrusion-prevention-with-suricata
Source: https://github.com/xalgord/xalgorix/tree/main/internal/tools/skills/data/network-security/implementing-network-intrusion-prevention-with-suricata
Command: npx skills add https://github.com/xalgord/xalgorix --skill implementing-network-intrusion-prevention-with-suricata

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Setting up Suricata as a true inline intrusion prevention system is error-prone: drop rules silently do nothing on SPAN ports, ET Open signatures ship as alert-only, and misconfigured NFQUEUE or HOME_NET values leave traffic uninspected. This Skill provides a complete, verified workflow for deploying Suricata in IPS mode that actually blocks threats.

Core Features & Use Cases

  • Inline IPS Deployment: Configure NFQUEUE or AF_PACKET bridge mode with iptables rules, CPU affinity, and fail-open behavior for real-time traffic blocking.
  • Ruleset Management: Use suricata-update to enable ET Open, ET Pro, and community sources, convert alert rules to drop, and disable noisy signatures.
  • Custom Rule Writing: Ready-to-adapt detection rules for reverse shells, Cobalt Strike user agents, DGA domains, DNS tunneling, SMB lateral movement, and ICMP tunneling.
  • Use Case: A security engineer places Suricata inline on a network segment, loads Emerging Threats rules, converts malware signatures to drop actions, and verifies blocking with a test NIDS trigger before going live.

Quick Start

Deploy Suricata in inline IPS mode on my Ubuntu server with NFQUEUE, load the Emerging Threats ruleset, and verify that drop rules actually block test traffic.

Frequently Asked Questions about implementing-network-intrusion-prevention-with-suricata

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I set up Suricata as an IPS instead of IDS?▼

Run Suricata inline using NFQUEUE with an iptables FORWARD rule, or use AF_PACKET with copy-mode ips bridging two interfaces. A SPAN/TAP port only sees copies of traffic, so drop rules cannot block anything in that placement.

How do I convert Suricata alert rules to drop rules?▼

Add a modify.conf entry such as a regex matching the rule group, then run suricata-update to regenerate suricata.rules with drop actions. Verify in fast.log that entries show [Drop] rather than [wDrop], which indicates would-drop IDS behavior.

Why are my Suricata drop rules not blocking traffic?▼

The most common causes are running on a passive SPAN interface, a missing iptables NFQUEUE rule, or fail-open mode masking a crashed engine. Check iptables -L FORWARD -v for rising nfq counters and confirm inline placement.

What is the difference between ET Open and ET Pro rulesets?▼

ET Open is the free community-maintained Emerging Threats ruleset with broad coverage, while ET Pro is a commercial Proofpoint subscription with enhanced detection. Both are enabled through suricata-update, with ET Pro requiring a license oinkcode.

How do I reduce Suricata false positives before enabling blocking?▼

Run in IDS mode for two to four weeks, identify noisy signatures by counting alert signature IDs in eve.json, then apply suppress or rate_filter entries in threshold.config. Only convert tuned rules to drop actions afterward.

Related Skills

Explore More Software Engineering Skills→
DCx7C5DCx7C5

attack-SKILL.md

Computes choke-point risk scores from XM Cyber REST API attack path data and generates remediation reports.

Community
Advanced
GeneralReasoningGeneralReasoning
4

suricata-offline-evejson

Analyzes PCAP traffic offline with Suricata and validates detections via eve.json.

Official
Intermediate
AeonDaveAeonDave
15

nmap

Scan networks for hosts, ports, services, and operating systems.

Community
Intermediate
GhostPWNGhostPWN
4

Network Security & Traffic Analysis

Analyze PCAP files and firewall configurations to generate Suricata, Snort, and Zeek detection rules.

Official
Advanced