Disclaimer: This project is only for demonstration purposes and should not be used for illegal acts! 
Please have a look at why I published this tool. Thanks

Mantikor is an Open-Source address-resolution spoofing-Tool. The application is written in C# with the use of SharpPcap and PacketNet.

During my studies to become an IT specialist, I started to get very interested in programming network applications. Thereby, I noticed the huge number of possibilities and vulnerabilities in network protocols. After a short time, I got familiar with the ARP and NDP protocols. It didn’t take me much time to create the project called Mantikor. My intention was to learn more about ARP and NDP spoofing, combined with the idea of building some security mechanism to prevent it. For this reason I created this project to have a working vulnerability exploitation tool. For some years now, mechanisms such as "DAI" have been in place in Enterprise switches to prevent ARP spoofing. However, these features are not implemented in most networks.

Company networks have an easy way to prevent ARP using the DAI (Dynamic Arp Inspection) feature. This can be configured on switches. Firewalls can also detect spoofing attacks. Cisco.com: Understanding and Configuring Dynamic ARP Inspectio

The easiest solution to prevent ARP and NDP spoofing is to manually (statically) enter the MAC address of the gateway into the arp and ndp-table.

1. With Windows this can be done quite easily with the Powershell: (Example)

Get-NetAdapter

Which returns:

Name      InterfaceDescription                    ifIndex Status       MacAddress         LinkSpeed
----      --------------------                    ------- ------       ----------         ---------
Wi-Fi     Intel(R) Dual Band Wireless                  18 Disconnected 12-34-56-AB-CD-EF     6 Mbps
Ethernet  Intel(R) Ethernet Connection …                9 Up           78-90-12-GH-IJ-KL     1 Gbps

2. To create a static ARP cache entry for that interface (that survive a reboot):

New-NetNeighbor -InterfaceIndex 9 -IPAddress '192.168.178.1' -LinkLayerAddress '0000120000ff' -State Permanent

3. You can remove the entry we just created by running this:

Remove-NetNeighbor -InterfaceIndex 9 -IPAddress '192.168.178.1'

The same works for NDP. For this, the IPv6 address must be used instead of the IPv4 address of the gateway in step 2.

Mantikor is designed as a console program and can therefore also be executed directly via cmd or powershell. To select an item in the menu, the listed numbers are used. Mantikor allows to spoof either over IPv4/IPv6 or both protocols i.e. ARP and NDP at the same time.

To compile Mantikor you need .NET 8.0, Visual Studio (Windows) and Npcap installed on your computer.#

• V1.0.8.0 - SharpPcap 6.2.5.0, .NET 8.0, Linux Support, changed to LibPcapDevice, new method to resolve via ARP, NDP-Classes merged, Code-Cleanup, fixed wrong User-Inputs.

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Source: eRecht24.de Cheers 👀