# Enable IP forwarding (if you want to sniff, not just cut) echo 1 > /proc/sys/net/ipv4/ip_forward
Because of the limitations of using compatibility layers for low-level networking, security professionals using Kali Linux generally opt for native utilities. These tools offer greater precision, stability, and scriptability. 1. Bettercap
Mastering NetCut on Kali Linux: A Comprehensive Guide to Network Management
: Run the service and open your browser to the local hosting port (usually http://localhost:7080 ). sudo netcut Use code with caution. netcut kali linux
# List devices sudo netcut -s
Arcai.com (the creators of NetCut) provides a Linux binary that runs a local web server.
: A powerful, modern framework for network attacks and monitoring that features a web-based GUI similar to NetCut. # Enable IP forwarding (if you want to
bettercap is a more advanced framework that is actively maintained and offers a more stable connection than arpspoof .
| Category | Tool / Technique | Description | | :--- | :--- | :--- | | | arp -a (Command Line) | Allows quick viewing of the ARP table. If two different IPs share the same MAC address, an attack is likely in progress. | | | Wireshark | Filters ARP traffic to identify constant gratuitous replies. Look for arp.opcode == 2 packets flooding the network. | | | Arpwatch | A tool that monitors Ethernet activity and maintains a database of IP/MAC address pairs, alerting the administrator to changes via email. | | | ARP Monitor ( arp_toolkit ) | A tool that builds an in-memory ARP cache and monitors for MAC address changes for known IPs, providing instant alerts when a spoof is detected. | | 🛡️ Protection (Individual) | Static ARP Entry | The command sudo arp -s <GATEWAY_IP> <GATEWAY_MAC> manually locks the gateway's MAC address in your ARP cache, preventing the computer from accepting fraudulent updates. | | | Anti-NetCut Script | An automatic Bash script that detects the network interface and gateway, using the arp -s command to create a temporary static lock for protection until the next reboot. | | 🏢 Prevention (Network) | Dynamic ARP Inspection (DAI) | Available on professional managed switches, this feature validates ARP packets against a DHCP snooping binding database. Any ARP packet that does not match the database is dropped, completely neutralizing NetCut. | | | Port Security | Configuring the switch to accept only a limited number of MAC addresses per port makes it difficult for an attacker to bypass the DHCP server. |
To cut off a device's internet access:
Managing Network Connections on Kali Linux: Alternatives to NetCut
: Open two terminal windows to intercept the bi-directional traffic. Terminal 1 (Tell Target you are the Router): sudo arpspoof -i eth0 -t [Target IP] [Router IP] Use code with caution. Terminal 2 (Tell Router you are the Target): sudo arpspoof -i eth0 -t [Router IP] [Target IP] Use code with caution.