Here we have 5 possible ways of protecting against NetCut attacks. When NetCut is actively attacking a target on the network, it will continuously send spoofed packets to the gateway so that there is no chance for the gateway to obtain the correct dynamic ARP table. Even a packet sniffer such as Wireshark confirms that spoofed packets are sent to the gateway with a wrong MAC address mapped to the IP 192.168.2.8. Since the IP 192.168.2.8 isn’t mapped to the correct MAC address, the Internet connection breaks as well.

This means that NetCut sends a spoofed packet to inform the gateway that the IP 192.168.2.8 is associated with an incorrect MAC address. If you launch the XArp program from the notification tray icon, you will see that the MAC address for the IP 192.168.2.8 has been changed to 03-27-75-49-18-73 which is obviously wrong. The most important message would be the one that reports that the MAC address for the IP 192.168.2.8 has been changed from 00-21-5d-41-16-5a to 03-27-75-49-18-73. When NetCut starts attacking the IP 192.168.2.8 in an attempt to cut off the Internet connection, XArp immediately detects it and shows an alert popup with a few different messages. Take note of the MAC address 00-21-5d-41-16-5a circled in red which is associated with the IP 192.168.2.8. The screenshot below shows a running XArp without attacks. By installing XArp and running it, you will be instantly notified when it detects an ARP spoofing attack including the attack from NetCut. However you can use XArp, which is a freeware tool that can detect ARP spoofing.

Here is an investigation on how NetCut works and also the method to protect against the DoS attack.Īs we’ve mentioned earlier, none of the firewall software such as ZoneAlarm, Comodo, Outpost, GlassWire, SpyShelter, Privatefirewall, and etc is able to detect NetCut attack. In fact setting up static ARP entries like most other websites suggested will not protect you against NetCut attacks because NetCut directly attacks the gateway and not the user. The affected target will have no idea what’s happened even if he/she has a firewall program installed.ĭue to the way NetCut works, no firewall is able to prevent nor even detect the attack. You can then select any target from the list followed by clicking the “Cut off” button, and within seconds the target will lose its internet connection. Simply run the tool and it will detect all the connected devices in the same local area network. NetCut is very easy to use and can be used by anyone. Basically the ARP protocol is used to translate IP addresses to MAC addresses and NetCut exploits the weakness in the stateless ARP protocol due to the lack of authentication. NetCut is a Denial of Service type of tool that runs on Windows and is capable of cutting off a person’s internet connectivity when both are connected in the same local area network.

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