Selfishnet V0.1 Beta May 2026

Selfishnet v0.1 Beta is a portable Windows utility that uses ARP spoofing to intercept, throttle, or block the bandwidth of other devices connected to a local network. It requires WinPcap drivers, administrator privileges, and is often flagged by security software due to its methods. For a demonstration of the setup process, view the video at YouTube.

The following is a draft white paper for Selfishnet v0.1 Beta, a legacy network management utility used for controlling bandwidth allocation on local area networks (LAN). Technical Overview: Selfishnet v0.1 Beta

Date: April 26, 2026Subject: Local Area Network Bandwidth Management and Traffic Shaping 1. Abstract

Selfishnet v0.1 Beta is a lightweight, portable network utility designed for Windows-based systems to provide granular control over LAN traffic. By utilizing the WinPcap library, the software enables administrators to discover connected devices and manually throttle or block their upload and download speeds. This paper outlines its architectural dependencies, core functionality, and operational requirements. 2. Technical Prerequisites

Selfishnet is not a standalone executable; it operates as a wrapper for packet capture drivers. To function, the following must be present:

Packet Driver: Installation of WinPcap or Npcap is mandatory for the software to interface with the Network Interface Card (NIC). selfishnet v0.1 beta

Archiving Tool: Users must use tools like 7-Zip or WinRAR to extract the portable binary from its distribution archive.

Privilege Level: The application requires "Run as Administrator" permissions to execute low-level ARP (Address Resolution Protocol) spoofing commands. 3. Core Functionality

Selfishnet operates primarily through ARP Spoofing, allowing it to position the host machine as a "man-in-the-middle" between the router and other networked devices. Key Features:

Device Discovery: Scans the local network to list all active IP and MAC addresses.

Real-time Monitoring: Displays current bandwidth consumption (download/upload) for every detected node. Selfishnet v0

Bandwidth Throttling: Allows the user to input specific KB/s limits for targeted devices.

Network Blocking: Provides a "Block" checkbox to completely drop packets for specific devices, effectively disconnecting them from the internet without physical access. 4. Operational Workflow

Interface Selection: Upon launch, the user selects the active Network Interface Controller (Ethernet or Wi-Fi).

Network Discovery: Clicking the "Network Discovery" icon populates the device list.

Redirection: Clicking "Start Redirecting" initiates the ARP spoofing process, bringing all LAN traffic through the host machine. Successors and Spiritual Heirs

Control: The administrator modifies the "Download" or "Upload" columns to enforce traffic shaping policies. 5. Security and Ethical Considerations

Selfishnet is frequently categorized as a "grey-hat" tool. While useful for troubleshooting network congestion, it can be used maliciously to deny service to others on a shared network. Modern routers with ARP Inspection or Source Guard may detect and mitigate Selfishnet’s activities.

Successors and Spiritual Heirs

• NetCut (2009-2012): A more polished, GUI-driven version that did the same thing but added the ability to "cut" specific devices. NetCut was essentially SelfishNet for the masses.
• WiFi Kill (Android): In the early 2010s, apps on rooted Android phones used identical ARP spoofing techniques. Google eventually banned these from the Play Store.
• BetterCAP & Ettercap: These are modern, professional frameworks that include SelfishNet’s functionality as just one module among hundreds. They are used by penetration testers (with permission).

Modern Alternatives (For legitimate network admins)

If you need to test network resilience or monitor traffic, use modern, ethical tools:

| Tool | Purpose | Why it’s better | | :--- | :--- | :--- | | BetterCAP | ARP spoofing, sniffing | Active development, supports IPv6, HTTPS bypass modules. | | Ettercap | MITM attacks | The industry standard. Still updated via Linux repos. | | Wireshark | Passive monitoring | No spoofing required. Just listen to your own port. |

Why you shouldn't actually use SelfishNet today

Even if you get it working, don't.

1. It is detected instantly: Modern network switches (Smart switches) and security software (Windows Defender, CrowdStrike) will flag this behavior in milliseconds.
2. It breaks modern networks: On Wi-Fi (802.11ac/ax) and IPv6 networks, simple ARP spoofing often fails or causes a broadcast storm that crashes the router.
3. It’s a legal minefield: Using this on a coffee shop, office, or school network is a felony (Computer Fraud and Abuse Act in the US, similar laws globally).