Selfishnet V3 May 2026

I’m unable to provide a write-up, walkthrough, or analysis for something called “Selfishnet V3” — as I don’t have verified, specific information about that tool or program.

However, I can help you in a few different ways depending on what you actually need:

If this is a capture-the-flag (CTF) or hack-the-box style challenge –
Please share the context (platform, description, attached files, or relevant source code). I can explain networking concepts, packet manipulation, or scripting approaches that might apply.
If this is a known tool for network bandwidth control or traffic shaping –
I can explain how tools like tc (Linux traffic control), netem, or similar work, and how one might write a script to limit or prioritize traffic per device/IP.
If you meant a specific academic or research paper –
Provide the author/title, and I can summarize its content or methodology.
If this is malware or an unauthorized network tool –
I won’t provide code or exploitation steps, but I can discuss defensive strategies, detection, or general network security principles.

Please clarify what “Selfishnet V3” refers to, and I’ll give you a safe, helpful, and accurate technical response. Selfishnet V3

Selfishnet V3 is a popular tool used for local network management, primarily known for its ability to control and limit bandwidth usage for other devices connected to the same Wi-Fi network. How it Works

The software uses a technique known as ARP spoofing (or ARP cache poisoning).

The Trick: It sends fake "Address Resolution Protocol" messages to the router and other devices on the LAN.

The Result: It convinces every device on the network that your computer is the gateway (the router).

The Control: Because all internet traffic from other devices is routed through your machine first, you can choose to "choke" their speed or cut them off entirely. Key Features of V3

Device Discovery: Lists all devices (PCs, phones, tablets) currently connected to your network by their IP and MAC addresses. I’m unable to provide a write-up, walkthrough, or

Bandwidth Limiting: Allows you to set specific upload and download limits for any individual device.

Block Access: Includes a "Block" button to completely disconnect a specific user from the internet while keeping them on the Wi-Fi.

Compatibility: While older versions were designed for Windows XP/7, newer releases like V3.0.1 (often found on repositories like GitHub) are designed to work on Windows 10 and 11, provided they are run with administrator privileges. Important Considerations

Legality and Ethics: Using this tool on networks you do not own (like public Wi-Fi or a neighbor's network) can be illegal or against service terms.

Security Risk: Modern security software or advanced routers with "ARP Inspection" can often detect and block this behavior.

Requirements: It typically requires WinPcap or Npcap to be installed to capture and inject network packets. Releases · abelmez/SelfishNet - GitHub If this is a capture-the-flag (CTF) or hack-the-box

Selfishnet V3 Guide

How Selfishnet V3 Works (Technical Breakdown)

To understand the power of Selfishnet V3, you must understand ARP Spoofing. Most home networks rely on IP addresses and MAC addresses to route traffic. Selfishnet V3 acts as a "man-in-the-middle" (MITM) between the router and the target device.

Here is the step-by-step mechanics:

Network Scan: When you launch Selfishnet V3, it scans the local subnet (e.g., 192.168.1.0/24) to discover all connected devices, displaying their IP addresses, MAC addresses, and hostnames (e.g., "iPhone-Rachel" or "PS5-LivingRoom").
ARP Poisoning: The tool sends fake ARP messages to the router, claiming that your MAC address is associated with the target's IP address. Simultaneously, it tells the target that your MAC is the router.
Traffic Shaping: Once traffic is routed through your PC, Selfishnet V3 applies Linux tc (traffic control) filters. You can set precise limits—for example, limit upload to 10 Kbps or drop 50% of packets.
Forwarding: Finally, the tool forwards the throttled traffic to the legitimate destination, so the target never loses connectivity; they just experience excruciating lag.

Because Selfishnet V3 does not require router admin credentials or custom firmware (like DD-WRT or OpenWRT), it is incredibly accessible to anyone with a Linux laptop.

What is Selfishnet?

For the uninitiated, Selfishnet is a free, lightweight software application designed for Windows that allows you to manage and control internet traffic on your local network (LAN). It operates on the principle of ARP (Address Resolution Protocol) spoofing, allowing your computer to intercept traffic between the router and other devices on the network.

In simpler terms: It lets you see who is using the internet and decide how much speed they get.

Whether you want to block your neighbor who is leeching off your Wi-Fi or limit your sibling’s torrenting speed so you can game in peace, Selfishnet puts the power back in your hands.

Key Features of Selfishnet V3

Users who champion Selfishnet V3 highlight several specific features that set it apart from generic network limiters:

Real-time Bandwidth Graphs: Visualize exactly how much bandwidth each device is consuming at any given moment.
Per-Device Throttling: Limit specific IPs or MAC addresses without affecting other devices.
Connection Killing: Permanently block a device from accessing the internet entirely (de-auth attacks).
Lag Injection: Increase latency (ping) rather than just reducing speed, making online gaming impossible for the target.
MAC Spoofing Protection: Advanced versions bypass routers that use MAC filtering or static ARP tables.
Lightweight Design: Runs efficiently on Raspberry Pi, old laptops, or virtual machines, requiring minimal system resources.

SelfishNet v3 — Essay

1. Router QoS (Quality of Service)

Most modern routers (Asus, Netgear, TP-Link) have built-in QoS settings. Instead of throttling specific people, you prioritize specific traffic. For instance, you can set "Gaming" as high priority and "Streaming" as low priority. This affects all users fairly.