# IDS/IPS—Network-based IDS (NIDS) vs host-based IDS (HIDS)

Both Suricata and Wazuh can function as Intrusion Detection Systems (IDS), but they operate in different ways, and only Wazuh is primarily considered a Host-Based Intrusion Detection System (HIDS). Here's why:

#### **1. Wazuh - A Host-Based IDS (HIDS)**

* **Primary Role**: Wazuh is **primarily a HIDS** because it installs an agent on each monitored host to collect security-related data.
* **Key Features**:
  * **Log analysis** (syslog, auth logs, application logs)
  * **File Integrity Monitoring (FIM)** (detects changes to critical files)
  * **Rootkit & malware detection**
  * **Policy & compliance monitoring** (e.g., CIS benchmarks)
  * **Behavioral analysis** (anomaly detection)
* **Why HIDS?**\
  Wazuh operates at the **host level**, analyzing activities on the endpoint itself (like file changes, user logins, and process anomalies), making it a true **HIDS**.

#### **2. Suricata - Primarily a Network-Based IDS (NIDS)**

* **Primary Role**: Suricata is **primarily a NIDS/NIPS** (Network Intrusion Detection/Prevention System) that inspects network traffic for malicious activity.
* **Key Features**:
  * **Deep packet inspection (DPI)**
  * **Signature-based detection** (using rules like Snort/Suricata rules)
  * **Protocol analysis** (HTTP, DNS, TLS, etc.)
  * **Anomaly-based detection** (e.g., detecting DDoS, port scans)
* **Why NIDS?**\
  Suricata **does not** run as an agent on hosts; instead, it monitors **network traffic** (e.g., at a firewall, gateway, or mirrored port). While it can analyze traffic to/from a host, it does not monitor host-level activities like file changes or process behavior.

Here’s a tabulated comparison of **Suricata** and **Wazuh** in the context of **Host-Based Intrusion Detection (HIDS)** and **Network-Based Intrusion Detection (NIDS)**:

| Feature                       | **Wazuh** (HIDS)                                                                                                                                                  | **Suricata** (NIDS/NIPS)                                                                                                                                                   |
| ----------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Primary Role**              | Host-Based IDS (HIDS)                                                                                                                                             | Network-Based IDS/IPS (NIDS/NIPS)                                                                                                                                          |
| **Deployment**                | Agent-based (installed on hosts)                                                                                                                                  | Network-level (monitors traffic flows)                                                                                                                                     |
| **Key Functions**             | <p>- File Integrity Monitoring (FIM)<br>- Log analysis<br>- Rootkit/malware detection<br>- Compliance checks (CIS, PCI-DSS)<br>- Behavioral anomaly detection</p> | <p>- Deep Packet Inspection (DPI)<br>- Signature-based detection (Snort-compatible rules)<br>- Protocol analysis (HTTP, DNS, TLS)<br>- Detection of scans/DDoS attacks</p> |
| **Host-Level Monitoring?**    | **Yes** (tracks file changes, processes, user logins)                                                                                                             | **No** (only inspects network packets, even in host-based mode)                                                                                                            |
| **Network Traffic Analysis?** | Limited (can analyze forwarded logs)                                                                                                                              | **Yes** (real-time traffic inspection)                                                                                                                                     |
| **Best For**                  | Endpoint security, compliance, host-based threats                                                                                                                 | Network security, detecting malicious traffic patterns                                                                                                                     |
| **Common Use Case**           | <p>- Server/workstation monitoring<br>- Detecting unauthorized file changes<br>- SIEM integration (Elastic Stack)</p>                                             | <p>- Firewall/IPS complement<br>- Detecting exploits, C2 traffic, scans<br>- Network traffic logging</p>                                                                   |

#### **When to Use Each?**

| Scenario                                                        | Recommended Tool                  |
| --------------------------------------------------------------- | --------------------------------- |
| Monitoring host file changes, user logins, or process anomalies | **Wazuh (HIDS)**                  |
| Inspecting network traffic for malware, exploits, or attacks    | **Suricata (NIDS)**               |
| Needing **both** host and network security                      | **Wazuh + Suricata (Integrated)** |

If you need **host-based intrusion detection**, **Wazuh** is the better choice. If you need **network-level threat detection**, **Suricata** is more suitable. Many security setups use **both** for layered defense (Wazuh for hosts, Suricata for network).


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://dti-techs.gitbook.io/practical-foundations-in-cybersecurity/6.-practical-foundations-in-ethical-hacking/defensive-cybersecurity-technologies/ids-ips-network-based-ids-nids-vs-host-based-ids-hids.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.