> For the complete documentation index, see [llms.txt](https://ceh-practical.cavementech.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ceh-practical.cavementech.com/module-8.-sniffing/3.-detect-network-sniffing.md).
# 3. Detect Network Sniffing
A professional ethical hacker or pen tester should be able to detect network sniffing in the network.
## 1. Detect ARP Poisoning and promiscuous mode in a switched network
If you have a doubt on a target machine, ping it.
```
hping3 -c 1000000000 192.168.18.110
```
Now open Wireshark and edit preferences. Click on protocols options
From ARP menus, select detect ARP and IP spoofing.
Click **Analyze** from the menu bar and select **Expert Information** from the drop-down options. The **Wireshark . Expert Information** window appears; click to expand the **Warning** node labeled **Duplicate IP address configured (10.10.1.11)**, running on the **ARP/RARP** protocol.
Arrange the **Wireshark . Expert Information** window above the **Wireshark** window so that you can view the packet number and the **Packet details** section. In the **Wireshark . Expert Information** window, click any packet (here, **463**).
On selecting the packet number, **Wireshark** highlights the packet, and its associated information is displayed under the packet details section. Close the **Wireshark . Expert Information** window. The warnings highlighted in yellow indicate that duplicate IP addresses have been detected at one MAC address, as shown in the screenshot.
### Nmap promiscuous/ Monitor mode detection
```
sudo nmap --script sniffer-detect 192.168.18.1
```
## 2. Detect ARP Poisoning using Capsa Network Analyzer
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Requires use of school and work emails.
We can use hubu framework for arp poisoning
```
hubu.arp.poison 192.168.18.11 192.168.18.12
```
In the diagnosis tab, we can locate the ARP warning.
### CEH Practical Full Course
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